php基礎學習：影像處理

在學習php過程中會遇到影像處理的情況，本篇將會介紹影像處理的方法。

<!-- 影像處理 -->

<?php //     圖片處理gd2設定檔修改 ?>    <!-- 用圖片處理函數畫一張圖 --> <?php //     $img = imagecreatetruecolor(500, 500); //     $red = imagecolorallocate($img, 255, 0, 0); //     $green = imagecolorallocate($img, 0, 255, 0); //     $blue = imagecolorallocate($img, 0, 0, 255); //     $pur = imagecolorallocate($img, 255, 0, 255); //     $yellow = imagecolorallocate($img, 121, 72, 0);        //     imagefilledrectangle($img, 0, 0, 500, 500, $green); //     imageline($img, 0, 0, 500, 500, $red); //     imageline($img, 500, 0, 0, 500, $blue);        //     imagefilledellipse($img, 250, 250, 200, 200, $yellow);        //     imagefilledellipse($img, 200, 200, 300, 300, $blue);        //     imagejpeg($img, 'haha.jpg'); //     echo "<img src='haha.jpg'>"; //     imagedestroy($img); ?>    <!-- 開發驗證碼(產生驗證碼) --> <?php     check_code();     function check_code($width = 100, $height = 50,         $num = 4, $type = 'jpeg'){         $img = imagecreate($width, $height);         $string = '';         for ($i = 0;$i < $num; $i++){             $rand = mt_rand(0, 2);             switch ($rand) {                 case 0:                     $ascii = mt_rand(48, 57);                     break;                 case 1:                     $ascii = mt_rand(65, 90);                     break;                 case 2:                     $ascii = mt_rand(97, 122);                     break;             }             $string .= sprintf('%c', $ascii);         }         imagefilledrectangle($img, 0, 0, $width, $height, randBg($img));         for ($i = 0;$i < 50; $i++){             imagesetpixel($img, mt_rand(0, $width),                  mt_rand(0, $height), randPix($img));         }         for ($i = 0;$i < $num;$i++){             $x = floor($width/$num) * $i + 2;             $y = mt_rand(0, $height - 15);                            imagechar($img, 5, $x, $y, $string[$i], randPix($img));         }                    $func = 'image' . $type;         $header = 'Content-type:image/'.$type;         if (function_exists($func)) {             header($header);             $func($img);         }else {            echo '圖片類型不支援';          }         imagedestroy($img);         return $string;     }     function randBg($img){         return imagecolorallocate($img, mt_rand(130, 255),             mt_rand(130, 255), mt_rand(130, 255));     }     function randPix($img){         return imagecolorallocate($img, mt_rand(0, 120),              mt_rand(0, 120), mt_rand(0, 120));     } ?>  <!-- 映像縮放和剪裁技術 --> <?php     $image = imagecreatefrompng('fbb.png');            $percent = 0.1;     list($width, $height) = getimagesize('fbb.png');            $new_width = $width * $percent;     $new_height = $height * $percent;            $new_image = imagecreatetruecolor($new_width, $new_height);     imagecopyresampled($new_image, $image, 0, 0,         0, 0, $new_width, $new_height, $width, $height);     header('content-type:image/jpeg');     imagejpeg($new_image); ?> <!-- 圖片浮水印處理 --> <?php     $dst = imagecreatefrompng('https://img.php.cn/upload/course/000/         000/002/5833ebba648cf229.png');     $src = imagecreatefrompng('https://img.php.cn/         upload/course/000/000/002/5833ebe90cc11285.png');     $dst_info = getimagesize('5833ebba648cf229.png');     $src_info = getimagesize('5833ebe90cc11285.png');            $dst_x = $dst_info[0] - $src_info[0];     $dst_y = $dst_info[1] - $src_info[1];     imagecopymerge($dst, $src, $dst_x, $dst_y, 0, 0,          $src_info[0], $src_info[1], 100);     header('Content-type:image/png');     imagepng($dst);     imagedestroy($dst);     imagedestroy($src); ?>   <!-- 做一個智能的圖片浮水印函數 --> <?php        ?>

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