46 个非常有用的 PHP 代码片段

这些 PHP 片段对于 PHP 初学者也非常有帮助，非常容易学习，让我们开始学习吧～

1. 发送 SMS

在开发 Web 或者移动应用的时候，经常会遇到需要发送 SMS 给用户，或者因为登录原因，或者是为了发送信息。下面的 PHP 代码就实现了发送 SMS 的功能。
为了使用任何的语言发送 SMS，需要一个 SMS gateway。大部分的 SMS 会提供一个 API，这里是使用 MSG91 作为 SMS gateway。

    function send_sms($mobile,$msg)
    {
    $authKey = "XXXXXXXXXXX";
    date_default_timezone_set("Asia/Kolkata");
    $date = strftime("%Y-%m-%d %H:%M:%S");
    //Multiple mobiles numbers separated by comma
    $mobileNumber = $mobile;

    //Sender ID,While using route4 sender id should be 6 characters long.
    $senderId = "IKOONK";

    //Your message to send, Add URL encoding here.
    $message = urlencode($msg);

    //Define route 
    $route = "template";
    //Prepare you post parameters
    $postData = array(
     'authkey' => $authKey,
     'mobiles' => $mobileNumber,
     'message' => $message,
     'sender' => $senderId,
     'route' => $route
    );

    //API URL
    $url="https://control.msg91.com/sendhttp.php";

    // init the resource
    $ch = curl_init();
    curl_setopt_array($ch, array(
     CURLOPT_URL => $url,
     CURLOPT_RETURNTRANSFER => true,
     CURLOPT_POST => true,
     CURLOPT_POSTFIELDS => $postData
     //,CURLOPT_FOLLOWLOCATION => true
    ));


    //Ignore SSL certificate verification
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);


    //get response
    $output = curl_exec($ch);
    //Print error if any
    if(curl_errno($ch))
    {
     echo 'error:' . curl_error($ch);
    }

    curl_close($ch);
    }

其中"$authKey = "XXXXXXXXXXX";"需要你输入你的密码，"$senderId = "IKOONK";"需要你输入你的 SenderID。当输入移动号码的时候需要指定国家代码 (比如，美国是 1，印度是 91 )。
语法：

    <?php
    $message = "Hello World";
    $mobile = "918112998787";
    send_sms($mobile,$message);
    ?>

2. 使用 mandrill 发送邮件
Mandrill 是一款强大的 SMTP 提供器。开发者倾向于使用一个第三方 SMTP provider 来获取更好的收件交付。
下面的函数中，你需要把 "Mandrill.php" 放在同一个文件夹，作为 PHP 文件，这样就可以使用TA来发送邮件。

    function send_email($to_email,$subject,$message1)
    {
    require_once 'Mandrill.php';
    $apikey = 'XXXXXXXXXX'; //specify your api key here
    $mandrill = new Mandrill($apikey);

    $message = new stdClass();
    $message->html = $message1;
    $message->text = $message1;
    $message->subject = $subject;
    $message->from_email = "blog@koonk.com";//Sender Email
    $message->from_name = "KOONK";//Sender Name
    $message->to = array(array("email" => $to_email));
    $message->track_opens = true;

    $response = $mandrill->messages->send($message);
    }

$apikey = 'XXXXXXXXXX'; //specify your api key here"这里需要你指定你的 API 密钥（从 Mandrill 账户中获得）。
语法：

    <?php
    $to = "abc@example.com";
    $subject = "This is a test email";
    $message = "Hello World!";
    send_email($to,$subject,$message);
    ?>

为了达到最好的效果，最好按照 Mandrill 的教程去配置 DNS。

3. PHP 函数：阻止 SQL 注入
SQL 注入或者 SQLi 常见的攻击网站的手段，使用下面的代码可以帮助你防止这些工具。

    function clean($input)
    {
     if (is_array($input))
     {
     foreach ($input as $key => $val)
      {
      $output[$key] = clean($val);
      // $output[$key] = $this->clean($val);
     }
     }
     else
     {
     $output = (string) $input;
     // if magic quotes is on then use strip slashes
     if (get_magic_quotes_gpc()) 
     {
      $output = stripslashes($output);
     }
     // $output = strip_tags($output);
     $output = htmlentities($output, ENT_QUOTES, 'UTF-8');
     }
    // return the clean text
     return $output;
    }

语法：

    <?php
    $text = "<script>alert(1)</script>";
    $text = clean($text);
    echo $text;
    ?>

4. 检测用户位置
使用下面的函数，可以检测用户是在哪个城市访问你的网站

    function detect_city($ip) {

     $default = 'UNKNOWN';

     $curlopt_useragent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)';

     $url = 'http://ipinfodb.com/ip_locator.php?ip=' . urlencode($ip);
     $ch = curl_init();

     $curl_opt = array(
      CURLOPT_FOLLOWLOCATION => 1,
      CURLOPT_HEADER => 0,
      CURLOPT_RETURNTRANSFER => 1,
      CURLOPT_USERAGENT => $curlopt_useragent,
      CURLOPT_URL => $url,
      CURLOPT_TIMEOUT  => 1,
      CURLOPT_REFERER  => 'http://' . $_SERVER['HTTP_HOST'],
     );

     curl_setopt_array($ch, $curl_opt);

     $content = curl_exec($ch);

     if (!is_null($curl_info)) {
      $curl_info = curl_getinfo($ch);
     }

     curl_close($ch);

     if ( preg_match('{<li>City : ([^<]*)</li>}i', $content, $regs) ) {
      $city = $regs[1];
     }
     if ( preg_match('{<li>State/Province : ([^<]*)</li>}i', $content, $regs) ) {
      $state = $regs[1];
     }

     if( $city!='' && $state!='' ){
      $location = $city . ', ' . $state;
      return $location;
     }else{
      return $default; 
     }

     }

语法：

    <?php
    $ip = $_SERVER['REMOTE_ADDR'];
    $city = detect_city($ip);
    echo $city;
    ?>

5. 获取 Web 页面的源代码
使用下面的函数，可以获取任意 Web 页面的 HTML 代码

    function display_sourcecode($url)
    {
    $lines = file($url);
    $output = "";
    foreach ($lines as $line_num => $line) { 
     // loop thru each line and prepend line numbers
     $output.= "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "\n";
    }
    }

语法：

    <?php
    $url = "http://blog.koonk.com";
    $source = display_sourcecode($url);
    echo $source;
    ?>

6. 计算喜欢你的 Facebook 页面的用户

    function fb_fan_count($facebook_name)
    {
     $data = json_decode(file_get_contents("https://graph.facebook.com/".$facebook_name));
     $likes = $data->likes;
     return $likes;
    }

语法：

    <?php
    $page = "koonktechnologies";
    $count = fb_fan_count($page);
    echo $count;
    ?>

7. 确定任意图片的主导颜色

    function dominant_color($image)
    {
    $i = imagecreatefromjpeg($image);
    for ($x=0;$x<imagesx($i);$x++) {
     for ($y=0;$y<imagesy($i);$y++) {
     $rgb = imagecolorat($i,$x,$y);
     $r = ($rgb >> 16) & 0xFF;
     $g = ($rgb >> & 0xFF;
     $b = $rgb & 0xFF;
     $rTotal += $r;
     $gTotal += $g;
     $bTotal += $b;
     $total++;
     }
    }
    $rAverage = round($rTotal/$total);
    $gAverage = round($gTotal/$total);
    $bAverage = round($bTotal/$total);
    }

8. whois 查询
使用下面的函数可以获取任何域名用户的完整细节

    function whois_query($domain) {

     // fix the domain name:
     $domain = strtolower(trim($domain));
     $domain = preg_replace('/^http:\/\//i', '', $domain);
     $domain = preg_replace('/^www\./i', '', $domain);
     $domain = explode('/', $domain);
     $domain = trim($domain[0]);

     // split the TLD from domain name
     $_domain = explode('.', $domain);
     $lst = count($_domain)-1;
     $ext = $_domain[$lst];

     // You find resources and lists 
     // like these on wikipedia: 
     //
     // http://de.wikipedia.org/wiki/Whois
     //
     $servers = array(
     "biz" => "whois.neulevel.biz",
     "com" => "whois.internic.net",
     "us" => "whois.nic.us",
     "coop" => "whois.nic.coop",
     "info" => "whois.nic.info",
     "name" => "whois.nic.name",
     "net" => "whois.internic.net",
     "gov" => "whois.nic.gov",
     "edu" => "whois.internic.net",
     "mil" => "rs.internic.net",
     "int" => "whois.iana.org",
     "ac" => "whois.nic.ac",
     "ae" => "whois.uaenic.ae",
     "at" => "whois.ripe.net",
     "au" => "whois.aunic.net",
     "be" => "whois.dns.be",
     "bg" => "whois.ripe.net",
     "br" => "whois.registro.br",
     "bz" => "whois.belizenic.bz",
     "ca" => "whois.cira.ca",
     "cc" => "whois.nic.cc",
     "ch" => "whois.nic.ch",
     "cl" => "whois.nic.cl",
     "cn" => "whois.cnnic.net.cn",
     "cz" => "whois.nic.cz",
     "de" => "whois.nic.de",
     "fr" => "whois.nic.fr",
     "hu" => "whois.nic.hu",
     "ie" => "whois.domainregistry.ie",
     "il" => "whois.isoc.org.il",
     "in" => "whois.ncst.ernet.in",
     "ir" => "whois.nic.ir",
     "mc" => "whois.ripe.net",
     "to" => "whois.tonic.to",
     "tv" => "whois.tv",
     "ru" => "whois.ripn.net",
     "org" => "whois.pir.org",
     "aero" => "whois.information.aero",
     "nl" => "whois.domain-registry.nl"
     );

     if (!isset($servers[$ext])){
     die('Error: No matching nic server found!');
     }

     $nic_server = $servers[$ext];

     $output = '';

     // connect to whois server:
     if ($conn = fsockopen ($nic_server, 43)) {
     fputs($conn, $domain."\r\n");
     while(!feof($conn)) {
      $output .= fgets($conn,128);
     }
     fclose($conn);
     }
     else { die('Error: Could not connect to ' . $nic_server . '!'); }

     return $output;
    }

语法：

    <?php
    $domain = "http://www.blog.koonk.com";
    $result = whois_query($domain);
    print_r($result);
    ?>

9. 验证邮箱地址
有时候，当在网站填写表单，用户可能会输入错误的邮箱地址，这个函数可以验证邮箱地址是否有效。

    function is_validemail($email)
    {
    $check = 0;
    if(filter_var($email,FILTER_VALIDATE_EMAIL))
    {
    $check = 1;
    }
    return $check;
    }

    语法：
    <?php
    $email = "blog@koonk.com";
    $check = is_validemail($email);
    echo $check;
    // If the output is 1, then email is valid.
    ?>

10. 获取用户的真实 IP

    function getRealIpAddr() 
    { 
     if (!emptyempty($_SERVER['HTTP_CLIENT_IP'])) 
     { 
     $ip=$_SERVER['HTTP_CLIENT_IP']; 
     } 
     elseif (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR'])) 
     //to check ip is pass from proxy 
     { 
     $ip=$_SERVER['HTTP_X_FORWARDED_FOR']; 
     } 
     else 
     { 
     $ip=$_SERVER['REMOTE_ADDR']; 
     } 
     return $ip; 
    }

语法：

    <?php
    $ip = getRealIpAddr();
    echo $ip;
    ?>

11. 转换 URL：从字符串变成超链接
如果你正在开发论坛，博客或者是一个常规的表单提交，很多时候都要用户访问一个网站。使用这个函数，URL 字符串就可以自动的转换为超链接。

    function makeClickableLinks($text) 
    { 
     $text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+)', 
     '<a href="\1">\1</a>', $text); 
     $text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)', 
     '\1<a href="http://\2">\2</a>', $text); 
     $text = eregi_replace('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})', 
     '<a href="mailto:\1">\1</a>', $text); 

    return $text; 
    }

    语法：
    <?php
    $text = "This is my first post on http://blog.koonk.com";
    $text = makeClickableLinks($text);
    echo $text;
    ?>

12. 阻止多个 IP 访问你的网站
这个代码片段可以方便你禁止某些特定的 IP 地址访问你的网站

    if ( !file_exists('blocked_ips.txt') ) {
     $deny_ips = array(
     '127.0.0.1',
     '192.168.1.1',
     '83.76.27.9',
     '192.168.1.163'
     );
    } else {
     $deny_ips = file('blocked_ips.txt');
    }
    // read user ip adress:
    $ip = isset($_SERVER['REMOTE_ADDR']) ? trim($_SERVER['REMOTE_ADDR']) : '';

    // search current IP in $deny_ips array
    if ( (array_search($ip, $deny_ips))!== FALSE ) {
     // address is blocked:
     echo 'Your IP adress ('.$ip.') was blocked!';
     exit;
    }

13. 强制性文件下载
如果你需要下载特定的文件而不用另开新窗口，下面的代码片段可以帮助你。

    function force_download($file) 
    { 
     $dir = "../log/exports/"; 
     if ((isset($file))&&(file_exists($dir.$file))) { 
     header("Content-type: application/force-download"); 
     header('Content-Disposition: inline; filename="' . $dir.$file . '"'); 
     header("Content-Transfer-Encoding: Binary"); 
     header("Content-length: ".filesize($dir.$file)); 
     header('Content-Type: application/octet-stream'); 
     header('Content-Disposition: attachment; filename="' . $file . '"'); 
     readfile("$dir$file"); 
     } else { 
     echo "No file selected"; 
     } 
    }

语法：

    <php
    force_download("image.jpg");
    ?>

14. 创建 JSON 数据
使用下面的 PHP 片段可以创建 JSON 数据，可以方便你创建移动应用的 Web 服务

    $json_data = array ('id'=>1,'name'=>"Mohit");
    echo json_encode($json_data);

15. 压缩 zip 文件
使用下面的 PHP 片段可以即时压缩 zip 文件

    function create_zip($files = array(),$destination = '',$overwrite = false) { 
     //if the zip file already exists and overwrite is false, return false 
     if(file_exists($destination) && !$overwrite) { return false; } 
     //vars 
     $valid_files = array(); 
     //if files were passed in... 
     if(is_array($files)) { 
     //cycle through each file 
     foreach($files as $file) { 
      //make sure the file exists 
      if(file_exists($file)) { 
      $valid_files[] = $file; 
      } 
     } 
     } 
     //if we have good files... 
     if(count($valid_files)) { 
     //create the archive 
     $zip = new ZipArchive(); 
     if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) { 
      return false; 
     } 
     //add the files 
     foreach($valid_files as $file) { 
      $zip->addFile($file,$file); 
     } 
     //debug 
     //echo 'The zip archive contains ',$zip->numFiles,' files with a status of ',$zip->status; 

     //close the zip -- done! 
     $zip->close(); 

     //check to make sure the file exists 
     return file_exists($destination); 
     } 
     else 
     { 
     return false; 
     } 
    }

    语法：
    <?php
    $files=array('file1.jpg', 'file2.jpg', 'file3.gif'); 
    create_zip($files, 'myzipfile.zip', true); 
    ?>

16. 解压文件

    function unzip($location,$newLocation)
    {
     if(exec("unzip $location",$arr)){
      mkdir($newLocation);
      for($i = 1;$i< count($arr);$i++){
      $file = trim(preg_replace("~inflating: ~","",$arr[$i]));
      copy($location.'/'.$file,$newLocation.'/'.$file);
      unlink($location.'/'.$file);
      }
      return TRUE;
     }else{
      return FALSE;
     }
    }

语法：

    <?php
    unzip('test.zip','unziped/test'); //File would be unzipped in unziped/test folder
    ?>

17. 缩放图片

    function resize_image($filename, $tmpname, $xmax, $ymax) 
    { 
     $ext = explode(".", $filename); 
     $ext = $ext[count($ext)-1]; 

     if($ext == "jpg" || $ext == "jpeg") 
     $im = imagecreatefromjpeg($tmpname); 
     elseif($ext == "png") 
     $im = imagecreatefrompng($tmpname); 
     elseif($ext == "gif") 
     $im = imagecreatefromgif($tmpname); 

     $x = imagesx($im); 
     $y = imagesy($im); 

     if($x <= $xmax && $y <= $ymax) 
     return $im; 

     if($x >= $y) { 
     $newx = $xmax; 
     $newy = $newx * $y / $x; 
     } 
     else { 
     $newy = $ymax; 
     $newx = $x / $y * $newy; 
     } 

     $im2 = imagecreatetruecolor($newx, $newy); 
     imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y); 
     return $im2; 
    }

18. 使用 mail() 发送邮件
之前我们提供了如何使用 Mandrill 发送邮件的 PHP 代码片段，但是如果你不想使用第三方服务，那么可以使用下面的 PHP 代码片段。

    function send_mail($to,$subject,$body)
    {
    $headers = "From: KOONK\r\n";
    $headers .= "Reply-To: blog@koonk.com\r\n";
    $headers .= "Return-Path: blog@koonk.com\r\n";
    $headers .= "X-Mailer: PHP5\n";
    $headers .= 'MIME-Version: 1.0' . "\n";
    $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
    mail($to,$subject,$body,$headers);
    }

    语法：
    <?php
    $to = "admin@koonk.com";
    $subject = "This is a test mail";
    $body = "Hello World!";
    send_mail($to,$subject,$body);
    ?>

19. 把秒转换成天数，小时数和分钟

    function secsToStr($secs) {
     if($secs>=86400){$days=floor($secs/86400);$secs=$secs%86400;$r=$days.' day';if($days<>1){$r.='s';}if($secs>0){$r.=', ';}}
     if($secs>=3600){$hours=floor($secs/3600);$secs=$secs%3600;$r.=$hours.' hour';if($hours<>1){$r.='s';}if($secs>0){$r.=', ';}}
     if($secs>=60){$minutes=floor($secs/60);$secs=$secs%60;$r.=$minutes.' minute';if($minutes<>1){$r.='s';}if($secs>0){$r.=', ';}}
     $r.=$secs.' second';if($secs<>1){$r.='s';}
     return $r;
    }

语法：

    <?php
    $seconds = "56789";
    $output = secsToStr($seconds);
    echo $output;
    ?>

20. 数据库连接
连接 MySQL 数据库

    <?php
    $DBNAME = 'koonk';
    $HOST = 'localhost';
    $DBUSER = 'root';
    $DBPASS = 'koonk';
    $CONNECT = mysql_connect($HOST,$DBUSER,$DBPASS);
    if(!$CONNECT)
    {
     echo 'MySQL Error: '.mysql_error();
    }
    $SELECT = mysql_select_db($DBNAME);
    if(!$SELECT)
    {
     echo 'MySQL Error: '.mysql_error();
    }
    ?>

21. 目录清单
使用下面的 PHP 代码片段可以在一个目录中列出所有文件和文件夹

    function list_files($dir)
    {
     if(is_dir($dir))
     {
     if($handle = opendir($dir))
     {
      while(($file = readdir($handle)) !== false)
      {
      if($file != "." && $file != ".." && $file != "Thumbs.db"/*pesky windows, images..*/)
      {
       echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a>'."\n";
      }
      }
      closedir($handle);
     }
     }
    }

语法：

    <?php
     list_files("images/"); //This will list all files of images folder
    ?>

22. 检测用户语言
使用下面的 PHP 代码片段可以检测用户浏览器所使用的语言

    function get_client_language($availableLanguages, $default='en'){
     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
     $langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']);
     foreach ($langs as $value){
      $choice=substr($value,0,2);
      if(in_array($choice, $availableLanguages)){
      return $choice;
      }
     }
     } 
     return $default;
    }

23. 查看 CSV 文件

    function readCSV($csvFile){
     $file_handle = fopen($csvFile, 'r');
     while (!feof($file_handle) ) {
     $line_of_text[] = fgetcsv($file_handle, 1024);
     }
     fclose($file_handle);
     return $line_of_text;
    }

    语法：
    <?php
    $csvFile = "test.csv";
    $csv = readCSV($csvFile);
    $a = csv[0][0]; // This will get value of Column 1 & Row 1
    ?>

24. 从 PHP 数据创建 CSV 文件

    function generateCsv($data, $delimiter = ',', $enclosure = '"') {
     $handle = fopen('php://temp', 'r+');
     foreach ($data as $line) {
      fputcsv($handle, $line, $delimiter, $enclosure);
     }
     rewind($handle);
     while (!feof($handle)) {
      $contents .= fread($handle, 8192);
     }
     fclose($handle);
     return $contents;
    }

    语法：
    <?php
    $data[0] = "apple";
    $data[1] = "oranges";
    generateCsv($data, $delimiter = ',', $enclosure = '"');
    ?>

25. 解析 XML 数据

    $xml_string="<?xml version='1.0'?>
    <moleculedb>
     <molecule name='Benzine'>
     <symbol>ben</symbol>
     <code>A</code>
     </molecule>
     <molecule name='Water'>
     <symbol>h2o</symbol>
     <code>K</code>
     </molecule>
    </moleculedb>";

    //load the xml string using simplexml function
    $xml = simplexml_load_string($xml_string);

    //loop through the each node of molecule
    foreach ($xml->molecule as $record)
    {
     //attribute are accessted by
     echo $record['name'], ' ';
     //node are accessted by -> operator
     echo $record->symbol, ' ';
     echo $record->code, '';
    }

26. 解析 JSON 数据

    $json_string='{"id":1,"name":"rolf","country":"russia","office":["google","oracle"]} ';
    $obj=json_decode($json_string);
    //print the parsed data
    echo $obj->name; //displays rolf
    echo $obj->office[0]; //displays google

27. 获取当前页面 URL
这个 PHP 片段可以帮助你让用户登录后直接跳转到之前浏览的页面

    function current_url()
    {
    $url = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
    $validURL = str_replace("&", "&", $url);
    return validURL;
    }

语法：

    <?php
    echo "Currently you are on: ".current_url();
    ?>

28. 从任意的 Twitter 账号获取最新的 Tweet

    function my_twitter($username) 
    {
     $no_of_tweets = 1;
     $feed = "http://search.twitter.com/search.atom?q=from:" . $username . "&rpp;=" . $no_of_tweets;
     $xml = simplexml_load_file($feed);
     foreach($xml->children() as $child) {
     foreach ($child as $value) {
      if($value->getName() == "link") $link = $value['href'];
      if($value->getName() == "content") {
      $content = $value . "";
     echo '<p class="twit">'.$content.' <a class="twt" href="'.$link.'" title=""> </a></p>';
      } 
     }
     } 
    }

    语法：
    <?php
    $handle = "koonktech";
    my_twitter($handle);
    ?>

29. 转发数量
使用这个 PHP 片段可以检测你的页面 URL 有多少转发数量

    function tweetCount($url) {
     $content = file_get_contents("http://api.tweetmeme.com/url_info?url=".$url);
     $element = new SimpleXmlElement($content);
     $retweets = $element->story->url_count;
     if($retweets){
     return $retweets;
     } else {
     return 0;
     }
    }

    语法：
    <?php
    $url = "http://blog.koonk.com";
    $count = tweetCount($url);
    return $count;
    ?>

30. 计算两个日期的差

    <?php
    $date1 = date( 'Y-m-d' );
    $date2 = "2015-12-04";
    $diff = abs(strtotime($date2) - strtotime($date1));
    $years = floor($diff / (365*60*60*24));
    $months = floor(($diff - $years * 365*60*60*24) / (30*60*60*24));
    $days = floor(($diff - $years * 365*60*60*24 - $months*30*60*60*24)/ (60*60*24));
    printf("%d years, %d months, %d days\n", $years, $months, $days);
    -------------------------------------------------------- OR
    $date1 = new DateTime("2007-03-24");
    $date2 = new DateTime("2009-06-26");
    $interval = $date1->diff($date2);
    echo "difference " . $interval->y . " years, " . $interval->m." months, ".$interval->d." days "; 
    // shows the total amount of days (not divided into years, months and days like above)
    echo "difference " . $interval->days . " days ";
    -------------------------------------------------------- OR


    /**
     * Calculate differences between two dates with precise semantics. Based on PHPs DateTime::diff()
     * implementation by Derick Rethans. Ported to PHP by Emil H, 2011-05-02. No rights reserved.
     * 
     * See here for original code:
     * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/tm2unixtime.c?revision=302890&view;=markup
     * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/interval.c?revision=298973&view;=markup
     */
    function _date_range_limit($start, $end, $adj, $a, $b, $result)
    {
     if ($result[$a] < $start) {
     $result[$b] -= intval(($start - $result[$a] - 1) / $adj) + 1;
     $result[$a] += $adj * intval(($start - $result[$a] - 1) / $adj + 1);
     }
     if ($result[$a] >= $end) {
     $result[$b] += intval($result[$a] / $adj);
     $result[$a] -= $adj * intval($result[$a] / $adj);
     }
     return $result;
    }
    function _date_range_limit_days($base, $result)
    {
     $days_in_month_leap = array(31, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
     $days_in_month = array(31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
     _date_range_limit(1, 13, 12, "m", "y", &$base);
     $year = $base["y"];
     $month = $base["m"];
     if (!$result["invert"]) {
     while ($result["d"] < 0) {
      $month--;
      if ($month < 1) {
      $month += 12;
      $year--;
      }
      $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0);
      $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];
      $result["d"] += $days;
      $result["m"]--;
     }
     } else {
     while ($result["d"] < 0) {
      $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0);
      $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];
      $result["d"] += $days;
      $result["m"]--;
      $month++;
      if ($month > 12) {
      $month -= 12;
      $year++;
      }
     }
     }
     return $result;
    }
    function _date_normalize($base, $result)
    {
     $result = _date_range_limit(0, 60, 60, "s", "i", $result);
     $result = _date_range_limit(0, 60, 60, "i", "h", $result);
     $result = _date_range_limit(0, 24, 24, "h", "d", $result);
     $result = _date_range_limit(0, 12, 12, "m", "y", $result);
     $result = _date_range_limit_days(&$base, &$result);
     $result = _date_range_limit(0, 12, 12, "m", "y", $result);
     return $result;
    }
    /**
     * Accepts two unix timestamps.
     */
    function _date_diff($one, $two)
    {
     $invert = false;
     if ($one > $two) {
     list($one, $two) = array($two, $one);
     $invert = true;
     }
     $key = array("y", "m", "d", "h", "i", "s");
     $a = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $one))));
     $b = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $two))));
     $result = array();
     $result["y"] = $b["y"] - $a["y"];
     $result["m"] = $b["m"] - $a["m"];
     $result["d"] = $b["d"] - $a["d"];
     $result["h"] = $b["h"] - $a["h"];
     $result["i"] = $b["i"] - $a["i"];
     $result["s"] = $b["s"] - $a["s"];
     $result["invert"] = $invert ? 1 : 0;
     $result["days"] = intval(abs(($one - $two)/86400));
     if ($invert) {
     _date_normalize(&$a, &$result);
     } else {
     _date_normalize(&$b, &$result);
     }
     return $result;
    }
    $date = "2014-12-04 19:37:22";
    echo '<pre>';
    print_r( _date_diff( strtotime($date), time() ) );
    echo '</pre>'; 
    ?>

31. 删除文件夹内容

    function Delete($path)
    {
     if (is_dir($path) === true)
     {
     $files = array_diff(scandir($path), array('.', '..'));
     foreach ($files as $file)
     {
      Delete(realpath($path) . '/' . $file);
     }
     return rmdir($path);
     }
     else if (is_file($path) === true)
     {
     return unlink($path);
     }
     return false;
    }

语法：

    <?php
    $path = "images/";
    Delete($path); // This will delete images folder along with its contents.
    ?>

32. 搜索和高亮字符串中的关键字

    function highlighter_text($text, $words)
    {
     $split_words = explode( " " , $words );
     foreach($split_words as $word)
     {
     $color = "#4285F4";
     $text = preg_replace("|($word)|Ui" ,
      "<span style=\"color:".$color.";\"><b>$1</b></span>" , $text );
     }
     return $text;
    }

语法：

    <?php
    $string = "I like chocolates and I like apples";
    $words = "apple";
    echo highlighter_text($string ,$words);
    ?>

33. 写入文件

    <?
    $filename = 'blog.csv';
    $fp = fopen($filename, 'w');
    $output = " Hello ";
    $output .= " World! ";
    $output .= "\r\n";
    fputs($fp, $output);
    fclose($fp);
    ?>

34. 根据 URL 下载图片

    function imagefromURL($image,$rename)
    {
    $ch = curl_init($image);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_BINARYTRANSFER,1);
    $rawdata=curl_exec ($ch);
    curl_close ($ch);
    $fp = fopen("$rename",'w');
    fwrite($fp, $rawdata); 
    fclose($fp);
    }

语法：

    <?php
    $url = "http://koonk.com/images/logo.png";
    $rename = "koonk.png";
    imagefromURL($url,$rename);
    ?>

35. 检测 URL 是否有效

    function isvalidURL($url)
    {
    $check = 0;
    if (filter_var($url, FILTER_VALIDATE_URL) !== false) {
     $check = 1;
    }
    return $check;
    }

    语法：
    <?php
    $url = "http://koonk.com";
    $check = checkvalidURL($url);
    echo $check; //if returns 1 then URL is valid.
    ?>

36. 生成二维码

    function qr_code($data, $type = "TXT", $size ='150', $ec='L', $margin='0') 
    {
     $types = array("URL" =--> "http://", "TEL" => "TEL:", "TXT"=>"", "EMAIL" => "MAILTO:");
     if(!in_array($type,array("URL", "TEL", "TXT", "EMAIL")))
     {
     $type = "TXT";
     }
     if (!preg_match('/^'.$types[$type].'/', $data))
     {
     $data = str_replace("\\", "", $types[$type]).$data;
     }
     $ch = curl_init();
     $data = urlencode($data);
     curl_setopt($ch, CURLOPT_URL, 'http://chart.apis.google.com/chart');
     curl_setopt($ch, CURLOPT_POST, true);
     curl_setopt($ch, CURLOPT_POSTFIELDS, 'chs='.$size.'x'.$size.'&cht;=qr&chld;='.$ec.'|'.$margin.'&chl;='.$data);
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
     curl_setopt($ch, CURLOPT_HEADER, false);
     curl_setopt($ch, CURLOPT_TIMEOUT, 30);
     $response = curl_exec($ch);
     curl_close($ch);
     return $response;
    }

语法：

    <?php
    header("Content-type: image/png");
    echo qr_code("http://koonk.com", "URL");
    ?>

37. 计算两个地图坐标之间的距离

    function getDistanceBetweenPointsNew($latitude1, $longitude1, $latitude2, $longitude2) {
     $theta = $longitude1 - $longitude2;
     $miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
     $miles = acos($miles);
     $miles = rad2deg($miles);
     $miles = $miles * 60 * 1.1515;
     $feet = $miles * 5280;
     $yards = $feet / 3;
     $kilometers = $miles * 1.609344;
     $meters = $kilometers * 1000;
     return compact('miles','feet','yards','kilometers','meters'); 
    }

语法：

    <?php
    $point1 = array('lat' => 40.770623, 'long' => -73.964367);
    $point2 = array('lat' => 40.758224, 'long' => -73.917404);
    $distance = getDistanceBetweenPointsNew($point1['lat'], $point1['long'], $point2['lat'], $point2['long']);
    foreach ($distance as $unit => $value) {
     echo $unit.': '.number_format($value,4).'';
    }
    ?>

38. 获取一个特定话题标签的所有 Tweets

    function getTweets($hash_tag) {
     $url = 'http://search.twitter.com/search.atom?q='.urlencode($hash_tag) ;
     echo "<p>Connecting to <strong>$url</strong> ...</p>";
     $ch = curl_init($url);
     curl_setopt ($ch, CURLOPT_RETURNTRANSFER, TRUE);
     $xml = curl_exec ($ch);
     curl_close ($ch);
     //If you want to see the response from Twitter, uncomment this next part out:
     //echo "<p>Response:</p>";
     //echo "<pre>".htmlspecialchars($xml)."</pre>";
     $affected = 0;
     $twelement = new SimpleXMLElement($xml);
     foreach ($twelement->entry as $entry) {
     $text = trim($entry->title);
     $author = trim($entry->author->name);
     $time = strtotime($entry->published);
     $id = $entry->id;
     echo "<p>Tweet from ".$author.": <strong>".$text."</strong> <em>Posted ".date('n/j/y g:i a',$time)."</em></p>";
     }
     return true ;
    }

39. 添加 th,st,nd 或者 rd 作为数字的后缀

    Friday the 13th
    function ordinal($cdnl){ 
     $test_c = abs($cdnl) % 10; 
     $ext = ((abs($cdnl) %100 < 21 && abs($cdnl) %100 > 4) ? 'th'
      : (($test_c < 4) ? ($test_c < 3) ? ($test_c < 2) ? ($test_c < 1) 
      ? 'th' : 'st' : 'nd' : 'rd' : 'th')); 
     return $cdnl.$ext; 
    }

语法：

    <?php
    $number = 10;
    echo ordinal($number); //output is 10th
    ?>

40. 限制文件下载的速度

    <?php
    // local file that should be send to the client
    $local_file = 'test-file.zip';
    // filename that the user gets as default
    $download_file = 'your-download-name.zip';

    // set the download rate limit (=> 20,5 kb/s)
    $download_rate = 20.5; 
    if(file_exists($local_file) && is_file($local_file)) {
     // send headers
     header('Cache-control: private');
     header('Content-Type: application/octet-stream'); 
     header('Content-Length: '.filesize($local_file));
     header('Content-Disposition: filename='.$download_file);

     // flush content
     flush(); 
     // open file stream
     $file = fopen($local_file, "r"); 
     while(!feof($file)) {

     // send the current file part to the browser
     print fread($file, round($download_rate * 1024)); 

     // flush the content to the browser
     flush();

     // sleep one second
     sleep(1); 
     } 

     // close file stream
     fclose($file);}
    else {
     die('Error: The file '.$local_file.' does not exist!');
    }
    ?>

41. 把文本转换成图片

    <?php
    header("Content-type: image/png");
    $string = $_GET['text'];
    $im = imagecreatefrompng("images/button.png");
    $color = imagecolorallocate($im, 255, 255, 255);
    $px = (imagesx($im) - 7.5 * strlen($string)) / 2;
    $py = 9;
    $fontSize = 1;
    imagestring($im, fontSize, $px, $py, $string, $color);
    imagepng($im);
    imagedestroy($im);
    ?>

42. 获取远程文件的大小

    function remote_filesize($url, $user = "", $pw = "")
    {
     ob_start();
     $ch = curl_init($url);
     curl_setopt($ch, CURLOPT_HEADER, 1);
     curl_setopt($ch, CURLOPT_NOBODY, 1);
     if(!empty($user) && !empty($pw))
     {
     $headers = array('Authorization: Basic ' . base64_encode("$user:$pw"));
     curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
     }
     $ok = curl_exec($ch);
     curl_close($ch);
     $head = ob_get_contents();
     ob_end_clean();
     $regex = '/Content-Length:\s([0-9].+?)\s/';
     $count = preg_match($regex, $head, $matches);
     return isset($matches[1]) ? $matches[1] : "unknown";
    }

语法：

    <?php
    $file = "http://koonk.com/images/logo.png";
    $size = remote_filesize($url);
    echo $size;
    ?>

43. 使用 imagebrick 进行 pdf 到图像的转换

    <?php
    $pdf_file = './pdf/demo.pdf';
    $save_to = './jpg/demo.jpg'; //make sure that apache has permissions to write in this folder! (common problem)
    //execute ImageMagick command 'convert' and convert PDF to JPG with applied settings
    exec('convert "'.$pdf_file.'" -colorspace RGB -resize 800 "'.$save_to.'"', $output, $return_var);
    if($return_var == 0) {  //if exec successfuly converted pdf to jpg
     print "Conversion OK";
    }
    else print "Conversion failed.".$output;
    ?>

44. 使用 tinyurl 生成短网址

    function get_tiny_url($url) 
    { 
     $ch = curl_init(); 
     $timeout = 5; 
     curl_setopt($ch,CURLOPT_URL,'http://tinyurl.com/api-create.php?url='.$url); 
     curl_setopt($ch,CURLOPT_RETURNTRANSFER,1); 
     curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout); 
     $data = curl_exec($ch); 
     curl_close($ch); 
     return $data; 
    }

语法：

    <?php
    $url = "http://blog.koonk.com/2015/07/Hello-World";
    $tinyurl = get_tiny_url($url);
    echo $tinyurl;
    ?>

45. youtube 下载链接生成器
使用下面的 PHP 片段可以让你的用户下载 Youtube 视频

    function str_between($string, $start, $end)
    { 
    $string = " ".$string; $ini = strpos($string,$start); if ($ini == 0) return ""; $ini += strlen($start); $len = strpos($string,$end,$ini) - $ini; return substr($string,$ini,$len); }
    function get_youtube_download_link(){
     $youtube_link = $_GET['youtube'];
     $youtube_page = file_get_contents($youtube_link);
     $v_id = str_between($youtube_page, "&video;_id=", "&");
     $t_id = str_between($youtube_page, "&t;=", "&");
     $flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t;=$t_id";
     $hq_flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t;=$t_id&fmt;=6";
     $mp4_link = "http://www.youtube.com/get_video?video_id=$v_id&t;=$t_id&fmt;=18";
     $threegp_link = "http://www.youtube.com/get_video?video_id=$v_id&t;=$t_id&fmt;=17";
     echo "\t\tDownload (right-click > save as):\n\t\t";
     echo "<a href=\"$flv_link\">FLV</a>\n\t\t";
     echo "<a href=\"$hq_flv_link\">HQ FLV (if available)</a>\n\t\t";
     echo "<a href=\"$mp4_link\">MP4</a>\n\t\t";
     echo "<a href=\"$threegp_link\">3GP</a>\n";
    }

46. Facebook 样式的时间戳

    Facebook (x mins age, y hours ago etc)
    function nicetime($date)
    {
     if(empty($date)) {
     return "No date provided";
     }

     $periods  = array("second", "minute", "hour", "day", "week", "month", "year", "decade");
     $lengths  = array("60","60","24","7","4.35","12","10");

     $now  = time();
     $unix_date  = strtotime($date);

     // check validity of date
     if(empty($unix_date)) { 
     return "Bad date";
     }
     // is it future date or past date
     if($now > $unix_date) { 
     $difference = $now - $unix_date;
     $tense  = "ago";

     } else {
     $difference = $unix_date - $now;
     $tense  = "from now";
     }

     for($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) {
     $difference /= $lengths[$j];
     }

     $difference = round($difference);

     if($difference != 1) {
     $periods[$j].= "s";
     }

     return "$difference $periods[$j] {$tense}";
    }

语法：

    <?php
    $date = "2015-07-05 03:45";
    $result = nicetime($date); // 2 days ago
    ?>

文章转自：http://blog.koonk.com