php图像裁剪服务器搭建

在我们的工作的项目中，有时候我们需要显示规定尺寸的图片，虽然可以通过css来控制显示大小。但是如果图片过大，会造成加载的延迟，影响网站整体性能。因此，我们需要一个服务器来帮助我们进行图片的裁剪。流程大致是，首先我们传给服务器原图像和裁剪的尺寸，然后服务器进行裁剪，生成对应的裁剪图片，下次我们再访问相同图像和相同的裁剪尺寸的时候，我们就不需要裁剪，直接进行图片的访问就行。

Talk is cheap, show me the code.

<?php // ①构建图片请求地址比如  http://xxx.com/resize.php?site=www&width=300&height=200&mode=2&path=uploadfile/helloworld.png // ②配置nginx重写规则  rewrite /s/(.*)/(\d+)x(\d+)-(\d)/(.*) /s/resize.php?site=$1&width=$2&height=$3&mode=$4&path=$5 last; //③进行裁剪图片的处理 $path = trim($_GET['path']); $mode = intval($_GET['mode']); $site = trim($_GET['site']); $width = intval($_GET['width']); $height = intval($_GET['height']); $site_list = array('crop' => '.'); $orig_dir = dirname(__FILE__); if (!array_key_exists($site, $site_list)) {     header('HTTP/1.1 400 Bad Request');     exit(); } if ($mode > 3 || $mode < 0) {     header('HTTP/1.1 400 Bad Request');     exit(); } $orig_file = $site_list[$site] . $path; if (!file_exists($orig_file)) {     header('HTTP/1.1 404 Not Found');     exit(); } $file_ext = '.' . pathinfo($path, PATHINFO_EXTENSION); $file_name = basename($path, $file_ext); $save_path = "{$orig_dir}/{$site}/{$width}x{$height}-{$mode}{$path}"; $save_dir = dirname($save_path); if (!file_exists($save_dir)) {     wpx_mkdir($save_dir); } $target_width = $width; $target_height = $height; $save_image = $save_dir . '/' . $file_name . '.jpg'; if (file_exists($save_image)) {     header('Content-Type: image/jpeg');     header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');     echo file_get_contents($save_image); } imagecropper2($orig_file, $target_width, $target_height, $save_image); die; //原图像对应缩放裁剪，会拉伸图片 function imagecropper2($source_path, $width, $height, $save_image) {          //获取原图像$filename的宽度$width_orig和高度$height_orig     $info =  getimagesize($source_path);          $width_orig = $info[0];     $height_orig = $info[1];     $mime = $info['mime'];          //根据参数$width和$height值，换算出等比例缩放的高度和宽度     if ($width && ($width_orig<$height_orig)){         $width = ($height/$height_orig)*$width_orig;     }else{         $height = ($width / $width_orig)*$height_orig;     }     //将原图缩放到这个新创建的图片资源中     $image_p = imagecreatetruecolor($width, $height);     //获取原图的图像资源     if($mime=='image/jpeg'){         $image = imagecreatefromjpeg($source_path);     }elseif($mime=='image/png'){         $image = imagecreatefrompng($source_path);     }elseif($mime=='image/gif'){         $image = imagecreatefromgif($source_path);     }          //使用imagecopyresampled()函数进行缩放设置     imagecopyresampled($image_p,$image,0,0,0,0,$width,$height,$width_orig,$height_orig);         //将缩放后的图片$image_p保存，100(质量最佳，文件最大)     if($mime=='image/jpeg'){         imagejpeg($image_p,$save_image);         header('Content-Type: image/jpeg');         imagejpeg($image_p);     }elseif($mime=='image/png'){         imagepng($image_p,$save_image);         header('Content-Type: image/jpeg');         imagepng($image_p);     }else{         imagegif($image_p,$save_image);         header('Content-Type: image/jpeg');         imagegif($image_p);     }      } //进行比例保存裁剪，会丢失图像部分像素 function imagecropper($source_path, $target_width, $target_height, $save_image) {     $source_info = getimagesize($source_path);     $source_width = $source_info[0];     $source_height = $source_info[1];     $source_mime = $source_info['mime'];     $source_ratio = $source_height / $source_width;     $target_ratio = $target_height / $target_width;     // 源图过高     if ($source_ratio > $target_ratio) {         $cropped_width = $source_width;         $cropped_height = $source_width * $target_ratio;         $source_x = 0;         $source_y = ($source_height – $cropped_height) / 2;     }     // 源图过宽     elseif ($source_ratio < $target_ratio) {         $cropped_width = $source_height / $target_ratio;         $cropped_height = $source_height;         $source_x = ($source_width – $cropped_width) / 2;         $source_y = 0;     }     // 源图适中     else {         $cropped_width = $source_width;         $cropped_height = $source_height;         $source_x = 0;         $source_y = 0;     }     switch ($source_mime) {         case 'image/gif':             $source_image = imagecreatefromgif($source_path);             break;         case 'image/jpeg':             $source_image = imagecreatefromjpeg($source_path);             break;         case 'image/png':             $source_image = imagecreatefrompng($source_path);             break;         default:             return false;             break;     }     $target_image = imagecreatetruecolor($target_width, $target_height);     $cropped_image = imagecreatetruecolor($cropped_width, $cropped_height);     // 裁剪     $bool = imagecopy($cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height);     // 缩放     $bool = imagecopyresampled($target_image, $cropped_image, 0, 0, 0, 0, $target_width, $target_height, $cropped_width, $cropped_height);     imagejpeg($target_image, $save_image);     header('Content-Type: image/jpeg');     imagejpeg($target_image);     imagedestroy($source_image);     imagedestroy($target_image);     imagedestroy($cropped_image); } // 循环生成目录 function wpx_mkdir($dir, $mode = 0777) {     if (is_dir($dir) || @mkdir($dir, $mode)) {         return true;     }     if (!wpx_mkdir(dirname($dir), $mode)) {         return false;     }     return @mkdir($dir, $mode); }

通过上面的处理，我们就将图片按照我们设置的尺寸进行了裁剪。我们还可以定期对裁剪图片进行清理，这样就不需要占用太多服务器空间。只有经常访问的图片才会一直保存。

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