1 captcher.php 2 header(‘Content-type:image/png‘); 3 session_start(); 4 $img = imagecreate(100, 30); 5 $captcha = array( 6     ‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, 7     ‘g‘, ‘h‘, ‘i‘, ‘j‘, ‘k‘, ‘l‘, 8     ‘m‘, ‘n‘, ‘o‘, ‘p‘, ‘q‘, ‘r‘, 9     ‘s‘, ‘t‘, ‘u‘, ‘v‘, ‘w‘, ‘x‘,10     ‘y‘, ‘z‘, ‘0‘, ‘1‘, ‘2‘, ‘3‘,11     ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘);12 $code = ‘‘;13 for($i=0;$i<4;$i++)14 {15     $code.=‘ ‘.$captcha[rand(0,35)];16 }17 $_SESSION[‘captcha‘] = $code;18 $bg  =  imagecolorallocate ( $img ,  255 ,  255 ,  255 );19 $textcolor  =  imagecolorallocate ( $img ,  0 ,  0 ,  255 );20 imagestring($img, 5, 10, 5, $code, $textcolor);21 imagepng($img);22 imagedestroy($img);23 24 captcher.html25 <script type="text/javascript" src="http://www.mamicode.com/jquery-2.1.1.js"></script>26 <div style="width:100px;height:30px;" >27 <image id="captcher" src="http://www.mamicode.com/test.php" style="width:100px;height:30px;border:1px solid #ff0000;"/>28 </div>29 <script>30     $("#captcher").click(function(){31         this.src = http://www.mamicode.com/‘test.php?id=‘+Math.random();32     });33 </script>

  1 header("Content-type:image/png");  2 function img2thumb($src_img, $dst_img, $width = 75, $height = 75, $cut = 0, $proportion = 0)  3 {  4     if(!is_file($src_img))  5     {  6         return false;  7     }  8     $ot = fileext($dst_img);  9     $otfunc = ‘image‘ . ($ot == ‘jpg‘ ? ‘jpeg‘ : $ot); 10     $srcinfo = getimagesize($src_img); 11     $src_w = $srcinfo[0]; 12     $src_h = $srcinfo[1]; 13     $type  = strtolower(substr(image_type_to_extension($srcinfo[2]), 1)); 14     $createfun = ‘imagecreatefrom‘ . ($type == ‘jpg‘ ? ‘jpeg‘ : $type); 15  16     $dst_h = $height; 17     $dst_w = $width; 18     $x = $y = 0; 19  20     /** 21      * 缩略图不超过源图尺寸（前提是宽或高只有一个） 22      */ 23     if(($width> $src_w && $height> $src_h) || ($height> $src_h && $width == 0) || ($width> $src_w && $height == 0)) 24     { 25         $proportion = 1; 26     } 27     if($width> $src_w) 28     { 29         $dst_w = $width = $src_w; 30     } 31     if($height> $src_h) 32     { 33         $dst_h = $height = $src_h; 34     } 35  36     if(!$width && !$height && !$proportion) 37     { 38         return false; 39     } 40     if(!$proportion) 41     { 42         if($cut == 0) 43         { 44             if($dst_w && $dst_h) 45             { 46                 if($dst_w/$src_w> $dst_h/$src_h) 47                 { 48                     $dst_w = $src_w * ($dst_h / $src_h); 49                     $x = 0 - ($dst_w - $width) / 2; 50                 } 51                 else 52                 { 53                     $dst_h = $src_h * ($dst_w / $src_w); 54                     $y = 0 - ($dst_h - $height) / 2; 55                 } 56             } 57             else if($dst_w xor $dst_h) 58             { 59                 if($dst_w && !$dst_h)  //有宽无高 60                 { 61                     $propor = $dst_w / $src_w; 62                     $height = $dst_h  = $src_h * $propor; 63                 } 64                 else if(!$dst_w && $dst_h)  //有高无宽 65                 { 66                     $propor = $dst_h / $src_h; 67                     $width  = $dst_w = $src_w * $propor; 68                 } 69             } 70         } 71         else 72         { 73             if(!$dst_h)  //裁剪时无高 74             { 75                 $height = $dst_h = $dst_w; 76             } 77             if(!$dst_w)  //裁剪时无宽 78             { 79                 $width = $dst_w = $dst_h; 80             } 81             $propor = min(max($dst_w / $src_w, $dst_h / $src_h), 1); 82             $dst_w = (int)round($src_w * $propor); 83             $dst_h = (int)round($src_h * $propor); 84             $x = ($width - $dst_w) / 2; 85             $y = ($height - $dst_h) / 2; 86         } 87     } 88     else 89     { 90         $proportion = min($proportion, 1); 91         $height = $dst_h = $src_h * $proportion; 92         $width  = $dst_w = $src_w * $proportion; 93     } 94  95     $src = $createfun($src_img); 96     $dst = imagecreatetruecolor($width ? $width : $dst_w, $height ? $height : $dst_h); 97     $white = imagecolorallocate($dst, 255, 255, 255); 98     imagefill($dst, 0, 0, $white); 99 100     if(function_exists(‘imagecopyresampled‘))101     {102         imagecopyresampled($dst, $src, $x, $y, 0, 0, $dst_w, $dst_h, $src_w, $src_h);103     }104     else105     {106         imagecopyresized($dst, $src, $x, $y, 0, 0, $dst_w, $dst_h, $src_w, $src_h);107     }108     $otfunc($dst, $dst_img);109     $image = imagepng($dst);110     //print_r($dst);111     imagedestroy($dst);112     imagedestroy($src);113     return $image;114 }115 function fileext($file)116 {117     return pathinfo($file, PATHINFO_EXTENSION);118 }119 120 $img = img2thumb(‘cj.png‘, ‘chen.png‘, 100, 100, 5, 0.6);

 1 $image = imagecreatetruecolor(100, 100); 2  3 $white    = imagecolorallocate($image, 0xFF, 0xFF, 0xFF); 4 $gray     = imagecolorallocate($image, 0xC0, 0xC0, 0xC0); 5 $darkgray = imagecolorallocate($image, 0x90, 0x90, 0x90); 6 $navy     = imagecolorallocate($image, 0x00, 0x00, 0x80); 7 $darknavy = imagecolorallocate($image, 0x00, 0x00, 0x50); 8 $red      = imagecolorallocate($image, 0xFF, 0x00, 0x00); 9 $darkred  = imagecolorallocate($image, 0x90, 0x00, 0x00);10 11 for ($i=60; $i>50; $i--) {12     imagefilledarc($image, 50, $i, 100, 50, 0, 45, $darknavy, IMG_ARC_PIE);13     imagefilledarc($image, 50, $i, 100, 50, 45, 75 , $darkgray, IMG_ARC_PIE);14     imagefilledarc($image, 50, $i, 100, 50, 75, 360 , $darkred, IMG_ARC_PIE);15 }16 imagefilledarc($image, 50, 50, 100, 50, 0, 45, $navy, IMG_ARC_PIE);17 imagefilledarc($image, 50, 50, 100, 50, 45, 75 , $gray, IMG_ARC_PIE);18 imagefilledarc($image, 50, 50, 100, 50, 75, 360 , $red, IMG_ARC_PIE);19 20 header(‘Content-type: image/png‘);21 imagepng($image);22 imagedestroy($image);

 1 $size = 450; 2 $image = imagecreatetruecolor($size, 280); 3 $back = imagecolorallocate($image, 255, 255, 255); 4 $border = imagecolorallocate($image, 0, 0, 0); 5  6 imagefilledrectangle($image, 0, 0, $size-1, $size-1, $back); 7 imagerectangle($image, 0, 0, $size-1, $size-1, $border); 8  9 10 $yellow_x = 100;11 $yellow_y = 85;12 $red_x = $yellow_x + 120;13 $red_y = $yellow_y;14 $blue_x   = $yellow_x + 240;15 $blue_y   = $yellow_y;16 $radius   = 150;17 $green_x = $yellow_x +60;18 $green_y = 180;19 $red_low_x = $green_x + 120;20 $red_low_y = $green_y;21 22 $yellow = imagecolorallocatealpha($image, 255, 255, 0,75);23 $red = imagecolorallocatealpha($image, 255, 0, 0, 75);24 $blue = imagecolorallocatealpha($image, 0, 0, 255, 75);25 $green = imagecolorallocatealpha($image, 0, 255, 0, 75);26 $red_low = imagecolorallocatealpha($image, 255, 0, 255, 75);27 28 imagefilledellipse($image, $yellow_x, $yellow_y, $radius, $radius, $yellow);29 imagefilledellipse($image, $red_x, $red_y, $radius, $radius, $red);30 imagefilledellipse($image, $blue_x, $blue_y, $radius, $radius, $blue);31 imagefilledellipse($image, $green_x, $green_y, $radius, $radius, $green);32 imagefilledellipse($image, $red_low_x, $red_low_y, $radius, $radius, $red_low);33 34 header(‘Content-Type:image/png‘);35 36 imagepng($image);37 imagedestroy($image);