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<?php
namespace captcha;
/*
*ÑeÖ¤ÂeÀa
*verify*½*¨Éu³ÉÑeÖ¤Âe×Ö*u´®
*entry*½*¨Éu³ÉÑeÖ¤Âe
*ÌرðÌaÐÑ£ºÕaÀiÒªÏÈÓÃentryÉu³ÉÑeÖ¤Âe£¬ÔÙÓÃverifyÉu³ÉÑeÖ¤ÂeµÄ×Ö*u´®£¬Ò²¾ÍÊDZØÐeÏȵ÷ÓÃentry£¬È»ºo²ÅÄܹ»µ÷ÓÃverifyÉu³ÉÑeÖ¤ÂeµÄ×Ö*u´®£¬ÔÒo´uÂeÒѾ˵Ã÷ÎÊÌaÁË£¬ÒoΪÑeÖ¤ÂeµÄ×Ö*u´®ÊÇÔÚentry*½*¨µ÷ÓÃcaptchaImageÉu³ÉµÄ£¬ËuÒÔ±ØÐeÏȵ÷ÓÃËu²ÅÐÐ
*ÓеĵØ*½¶ÔÖÐÎĵÄ×ÖÌaÒªÇo±È½Ï¸ß£¬ËuÒÔ£¬ÓеĵØ*½²»Ö§³ÖÖÐÎÄÑeÖ¤Âe
*/
class Captcha{
//ÅaÖòÎÊý
private $config = array();
//ÑeÖ¤Âe
private $verifyCode = '';
//»ñÈ¡ÅaÖÃÎļþµÄÅaÖÃÐÅÏ¢£¬¸øÀa´«²ÎÊý¾ÍÐУ¬ÀýÈçnew Captcha($config);$configÊÇÄaµÄÅaÖÃÎļþÐÅÏ¢
public function __construct($config=array('width'=>100,'height'=>40,'length'=>4,'size'=>7,'lines'=>0,'dots'=>0,'font'=>'simfang.ttf','rectangle'=>array(255,55,122),'charset'=>true,'chinese'=>'À´µ½Ð»u³¡Ö÷º½Õ¾Â¥½¨ÉeÔÚ»eÒo¹Øϵ´aeÐøÆÚ¼aËu¸ºÕ®ÎñËýÔÚÊÕµ½ÒªÇoËý³¥»¹Ç°*oÔÚ»eÒo¹Øϵ´aeÐøÆÚ¼aËuÇ*Õ®ÎñµÄ*¨Ôº´«Æ±ºoÒª¾«ÒaeÇo¾«ÉÆʼÉÆÖÕ')){
$this->config = $config;
}
//´´½¨ÑeÖ¤Âe
private function captchaImage(){
//»²¼
$img = imagecreatetruecolor($this->config['width'],$this->config['height']);
//Ìi³a»²¼ÑÕÉ«
imagefill($img,0,0,imagecolorallocate($img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255)));
//ÐeÒª±ß¿oÔo»±ß¿o
if($this->config['rectangle'] && is_array($this->config['rectangle']) && count($this->config['rectangle']) == 3){
$this->tangle($img);
}
$this->verifyCode = $this->code($img,$this->config['charset'],$this->config['chinese']);
//´aeÔÚÔoÌi¼Ó¸ÉÈÅÏß
if($this->config['lines']){
$this->codeLines($img);
}
//´aeÔÚÔoÌi¼Ó¸ÉÈŵa
if($this->config['dots']){
$this->codeDots($img);
}
return $img;
}
private function codeLines($img){
//»aeÖƸÉÈÅÏß
for($i=0;$i<$this->config['lines'];$i++){
imageline($img,mt_rand(0,$this->config['width'] / 10),mt_rand(0,$this->config['height']),mt_rand($this->config['width'] * 7/ 10,$this->config['width'] * 9/ 10),mt_rand(0,$this->config['height']),imagecolorallocate($img,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255)));
}
}
private function codeDots($img){
//Ìi¼ÓÔeµa
for($i=0;$i<$this->config['dots'];$i++){
//ÔeµaÑÕÉ«
$color = imagecolorallocate($img,mt_rand(0,180),mt_rand(0,180),mt_rand(0,180));
imagestring($img,mt_rand(1,3),mt_rand(0,170),mt_rand(0,30),'*',$color);
}
}
/*»²¼±ß¿o*/
private function tangle($img){
imagerectangle($img,0,0,$this->config['width']-1,$this->config['height']-1,imagecolorallocate($img,$this->config['rectangle'][0],$this->config['rectangle'][1],$this->config['rectangle'][2]));
}
/*Éu³ÉÑeÖ¤Âe,ĬÈÏÓ¢ÎÄ£¬$chΪtrueÔoΪÖÐÎÄ*/
private function code($img,$ch=false,$set=''){
$str = "";
//¼ÆËa¼a¸o
$span = ceil($this->config['width']/($this->config['length']+1));
if($ch && !empty($set)){
//Ëae»u²uÉu×Ö*u
$set = $this->config['chinese'];
for($i=0;$i<$this->config['length'];$i++){
$end = strlen($set)/3;
$pos = mt_rand(0,$end-1);
$str .= substr($set,$pos*3,3);
}
//ÿ´Î»aeÖÆÒ»¸o×Ö*u
for($i=1;$i<=$this->config['length'];$i++){
imagettftext($img,16,mt_rand(-30,60),$i*$span,$this->config['height']*3/5,imagecolorallocate($img,mt_rand(0,180),mt_rand(0,180),mt_rand(0,180)),$this->config['font'],substr($str,($i-1)*3,3));
}
}else{
//Ëae»uÉu³É×Öĸ»oÕßÊý×Ö
for($i=0;$i<$this->config['length'];$i++){
switch(mt_rand(0,2)){
case 0:
$str .= chr(mt_rand(65,90));
break;
case 1:
$str .= chr(mt_rand(97,122));
break;
case 2:
$str .= chr(mt_rand(48,57));
}
}
//ÿ´Î»aeÖÆÒ»¸o×Ö*u
for($i=1;$i<=$this->config['length'];$i++){
imagestring($img,$this->config['size'],$i*$span,0,$str[$i-1],imagecolorallocate($img,mt_rand(0,180),mt_rand(0,180),mt_rand(0,180)));
}
}
return $str;
}
//»ñÈ¡ÑeÖ¤Âe
public function verify(){
return $this->verifyCode;
}
//Éu³ÉÑeÖ¤Âe
public function entry(){
header("content-type:image/png");
imagepng($this->captchaImage());
}
}
$ob = new Captcha;
$ob->entry();
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