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5年以前 | 阅读数：986 次 | 编程语言：PHP

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ÔÚ web Ä¿Â¼ÏÂ½¨Á¢Ò»¸o admin Ä¿Â¼×÷ÎªÎÒÃÇµÄºoÌ¨Ä¿Â¼£¬´aeÅºoÌ¨´uÂeÎÄ¼þ¡£ÔÚ admin ÏÂ½¨Á¢Ò»¸o fonts Ä¿Â¼£¬ÓÃÓÚ´aeÅÖÆ×÷ÑeÖ¤ÂeËuÐe×ÖÌa¡£

ÔÚ admin ÏÂÐÂ½¨Ò»¸o Captcha.php ÎÄ¼þ£¬Õa¾ÍÊÇÎÒÃÇÐeÒª±a¼µÄÑeÖ¤ÂeÀaÎÄ¼þ¡£

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±a¼ Captcha.php ÎÄ¼þ£º


    <?php 
    /**
    * Captcha class
    */
    class Captcha
    {

      function __construct()
      {
        # code...
      }
    }

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    <?php 
    /**
    * Captcha class
    */
    class Captcha
    {
      private $codeNum;  //ÑeÖ¤ÂeÎ»Êý
      private $width;  //ÑeÖ¤ÂeÍ¼Æ¬¿i¶È
      private $height;  //ÑeÖ¤ÂeÍ¼Æ¬¸ß¶È
      private $img;  //Í¼Ïñ×ÊÔ´¾a±u
      private $lineFlag;  //ÊÇ*ñÉu³É¸ÉÈÅÏßÌo
      private $piexFlag;  //ÊÇ*ñÉu³É¸ÉÈÅµa
      private $fontSize;  //×ÖÌa´oÐ¡
      private $code;  //ÑeÖ¤Âe×Ö*u
      private $string;  //Éu³ÉÑeÖ¤ÂeµÄ×Ö*u¼¯
      private $font;  //×ÖÌa
      function __construct($codeNum = 4,$height = 50,$width = 150,$fontSize = 20,$lineFlag = true,$piexFlag = true)
      {
        $this->string = 'qwertyupmkjnhbgvfcdsxa123456789';  //È¥³ýÒ»Ð(C)Ïa½uµÄ×Ö*u
        $this->codeNum = $codeNum;
        $this->height = $height;
        $this->width = $width;
        $this->lineFlag = $lineFlag;
        $this->piexFlag = $piexFlag;
        $this->font = dirname(__FILE__).'/fonts/consola.ttf';
        $this->fontSize = $fontSize;
      }
    }

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$ wget http://labfile.oss.aliyuncs.com/courses/587/consola.ttf

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    //´´½¨Í¼Ïñ×ÊÔ´  
    public function createImage(){
        $this->img = imagecreate($this->width, $this->height);  //´´½¨Í¼Ïñ×ÊÔ´
        imagecolorallocate($this->img,mt_rand(0,100),mt_rand(0,100),mt_rand(0,100));  //Ìi³aÍ¼Ïñ±³¾°£¨Ê¹ÓÃÇ³É«£(C)
      }

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imagecreate£ºÐÂ½¨Ò»¸o»uÓÚµ÷É«°aµÄÍ¼Ïñ
imagecolorallocate£ºÎªÒ»uÍ¼ÏñÖÅaÑÕÉ«
mt_rand£ºÉu³É¸uºÃµÄËae»uÊý

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    //´´½¨ÑeÖ¤Âe  
    public function createCode(){
        $strlen = strlen($this->string)-1;
        for ($i=0; $i < $this->codeNum; $i++) { 
          $this->code .= $this->string[mt_rand(0,$strlen)];  //´Ó×Ö*u¼¯ÖÐËae»uÈ¡³oËÄ¸o×Ö*uÆ´½Ó
        }
         $_SESSION['code'] = $this->code;  //¼ÓÈe session ÖÐ

       //¼ÆËaÃ¿¸o×Ö*u¼a¾a
        $diff = $this->width/$this->codeNum;
        for ($i=0; $i < $this->codeNum; $i++) { 
              //ÎªÃ¿¸o×Ö*uÉu³ÉÑÕÉ«£¨Ê¹ÓÃÉiÉ«£(C)
         $txtColor = imagecolorallocate($this->img,mt_rand(100,255),mt_rand(100,255),mt_rand(100,255));
         //Ð´ÈeÍ¼Ïñ
          imagettftext($this->img, $this->fontSize, mt_rand(-30,30), $diff*$i+mt_rand(3,8), mt_rand(20,$this->height-10), $txtColor, $this->font, $this->code[$i]);
        }
      }

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imagecreate£ºÐÂ½¨Ò»¸o»uÓÚµ÷É«°aµÄÍ¼Ïñ
imagecolorallocate£ºÎªÒ»uÍ¼ÏñÖÅaÑÕÉ«
mt_rand£ºÉu³É¸uºÃµÄËae»uÊý

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    //´´½¨ÑeÖ¤Âe  
    public function createCode(){
        $strlen = strlen($this->string)-1;
        for ($i=0; $i < $this->codeNum; $i++) { 
          $this->code .= $this->string[mt_rand(0,$strlen)];  //´Ó×Ö*u¼¯ÖÐËae»uÈ¡³oËÄ¸o×Ö*uÆ´½Ó
        }
         $_SESSION['code'] = $this->code;  //¼ÓÈe session ÖÐ

       //¼ÆËaÃ¿¸o×Ö*u¼a¾a
        $diff = $this->width/$this->codeNum;
        for ($i=0; $i < $this->codeNum; $i++) { 
              //ÎªÃ¿¸o×Ö*uÉu³ÉÑÕÉ«£¨Ê¹ÓÃÉiÉ«£(C)
         $txtColor = imagecolorallocate($this->img,mt_rand(100,255),mt_rand(100,255),mt_rand(100,255));
         //Ð´ÈeÍ¼Ïñ
          imagettftext($this->img, $this->fontSize, mt_rand(-30,30), $diff*$i+mt_rand(3,8), mt_rand(20,$this->height-10), $txtColor, $this->font, $this->code[$i]);
        }
      }

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    //´´½¨¸ÉÈÅÏßÌo£¨Ä¬ÈÏËÄÌo£(C)
    public function createLines(){
        for ($i=0; $i < 4; $i++) { 
          $color = imagecolorallocate($this->img,mt_rand(0,155),mt_rand(0,155),mt_rand(0,155));  //Ê¹ÓÃÇ³É«
          imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color); 
        }
      }

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    //´´½¨¸ÉÈÅµa £¨Ä¬ÈÏÒ»°Ù¸oµa£(C)
    public function createPiex(){
        for ($i=0; $i < 100; $i++) { 
          $color = imagecolorallocate($this->img,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
          imagesetpixel($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),$color);
        }
      }

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     public function show()
      {
        $this->createImage();
        $this->createCode();
        if ($this->lineFlag) {  //ÊÇ*ñ´´½¨¸ÉÈÅÏßÌo
          $this->createLines();
        }
        if ($this->piexFlag) {  //ÊÇ*ñ´´½¨¸ÉÈÅµa
          $this->createPiex();
        }
        header('Content-type:image/png');  //ÇeÇoÒ³ÃaeµÄÄÚÈÝÊÇpng¸ñÊ½µÄÍ¼Ïñ
        imagepng($this->img);  //ÒÔpng¸ñÊ½Êa³oÍ¼Ïñ
        imagedestroy($this->img);  //Ça³ýÍ¼Ïñ×ÊÔ´£¬ÊÍ*ÅÄÚ´ae
      }

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imagedestroy£ºÏu»ÙÒ»Í¼Ïñ

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    public function getCode(){
        return $this->code;
      }
    ÍeÕu´uÂeÈçÏÂ£º
    <?php 
    /**
    * Captcha class
    */
    class Captcha
    {
      private $codeNum;
      private $width;
      private $height;
      private $img;
      private $lineFlag;
      private $piexFlag;
      private $fontSize;
      private $code;
      private $string;
      private $font;
      function __construct($codeNum = 4,$height = 50,$width = 150,$fontSize = 20,$lineFlag = true,$piexFlag = true)
      {
        $this->string = 'qwertyupmkjnhbgvfcdsxa123456789';
        $this->codeNum = $codeNum;
        $this->height = $height;
        $this->width = $width;
        $this->lineFlag = $lineFlag;
        $this->piexFlag = $piexFlag;
        $this->font = dirname(__FILE__).'/fonts/consola.ttf';
        $this->fontSize = $fontSize;
      }

      public function createImage(){
        $this->img = imagecreate($this->width, $this->height);
        imagecolorallocate($this->img,mt_rand(0,100),mt_rand(0,100),mt_rand(0,100));
      }

      public function createCode(){
        $strlen = strlen($this->string)-1;
        for ($i=0; $i < $this->codeNum; $i++) { 
          $this->code .= $this->string[mt_rand(0,$strlen)];
        }
        $_SESSION['code'] = $this->code;
        $diff = $this->width/$this->codeNum;
        for ($i=0; $i < $this->codeNum; $i++) { 
          $txtColor = imagecolorallocate($this->img,mt_rand(100,255),mt_rand(100,255),mt_rand(100,255));
          imagettftext($this->img, $this->fontSize, mt_rand(-30,30), $diff*$i+mt_rand(3,8), mt_rand(20,$this->height-10), $txtColor, $this->font, $this->code[$i]);
        }
      }

      public function createLines(){
        for ($i=0; $i < 4; $i++) { 
          $color = imagecolorallocate($this->img,mt_rand(0,155),mt_rand(0,155),mt_rand(0,155));
          imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color); 
        }
      }

      public function createPiexs(){
        for ($i=0; $i < 100; $i++) { 
          $color = imagecolorallocate($this->img,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
          imagesetpixel($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),$color);
        }
      }

      public function show()
      {
        $this->createImage();
        $this->createCode();
        if ($this->lineFlag) {
          $this->createLines();
        }
        if ($this->piexFlag) {
          $this->createPiexs();
        }
        header('Content-type:image/png');
        imagepng($this->img);
        imagedestroy($this->img);
      }

      public function getCode(){
        return $this->code;
      }
    }

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2.2 Ê¹ÓÃÑeÖ¤Âe

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    session_start(); //¿ªÆosession
    $captcha = new Captcha();  //ÊµÀý»¯ÑeÖ¤ÂeÀa(¿É×Ô¶¨Òa²ÎÊý)
    $captcha->show();  //µ÷ÓÃÊa³o

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    <div class="form-group">
     <div class="col-sm-12">
       <img src="admin/Captcha.php" alt="" id="codeimg" onclick="javascript:this.src = 'admin/Captcha.php?'+Math.random();">
       <span>Click to Switch</span>
     </div>
    </div>

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