2023-11-14 分類: 網(wǎng)站建設(shè)
在我們的工作的項(xiàng)目中,有時(shí)候我們需要顯示規(guī)定尺寸的圖片,雖然可以通過css來控制顯示大小。但是如果圖片過大,會(huì)造成加載的延遲,影響網(wǎng)站整體性能。因此,我們需要一個(gè)服務(wù)器來幫助我們進(jìn)行圖片的裁剪。流程大致是,首先我們傳給服務(wù)器原圖像和裁剪的尺寸,然后服務(wù)器進(jìn)行裁剪,生成對(duì)應(yīng)的裁剪圖片,下次我們?cè)僭L問相同圖像和相同的裁剪尺寸的時(shí)候,我們就不需要裁剪,直接進(jìn)行圖片的訪問就行。
Talk is cheap, show me the code.
<?php// ①構(gòu)建圖片請(qǐng)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重寫規(guī)則 rewrite /s/(.*)/(\d+)x(\d+)-(\d)/(.*) /s/resize.php?site=$1&width=$2&height=$3&mode=$4&path=$5 last;//③進(jìn)行裁剪圖片的處理$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, $save_image);die;//原圖像對(duì)應(yīng)縮放裁剪,會(huì)拉伸圖片function imagecropper2($source_path, $width, $height, $save_image){//獲取原圖像$filename的寬度$width_orig和高度$height_orig$info = getimagesize($source_path);$width_orig = $info[0];$height_orig = $info[1];$mime = $info['mime'];//根據(jù)參數(shù)$width和$height值,換算出等比例縮放的高度和寬度if ($width && ($width_orig<$height_orig)){$width = ($height/$height_orig)*$width_orig;}else{$height = ($width / $width_orig)*$height_orig;}//將原圖縮放到這個(gè)新創(chuàng)建的圖片資源中$image_p = imagecreatetruecolor($width, $height);//獲取原圖的圖像資源if($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()函數(shù)進(jìn)行縮放設(shè)置imagecopyresampled($image_p,$image,0,0,0,0,$width,$height,$width_orig,$height_orig);//將縮放后的圖片$image_p保存,100(質(zhì)量最佳,文件大)if($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);}}//進(jìn)行比例保存裁剪,會(huì)丟失圖像部分像素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 / $target_width;// 源圖過高if ($source_ratio > $target_ratio) {$cropped_width = $source_width;$cropped_height = $source_width * $target_ratio;$source_x = 0;$source_y = ($source_height – $cropped_height) / 2;}// 源圖過寬elseif ($source_ratio < $target_ratio) {$cropped_width = $source_height / $target_ratio;$cropped_height = $source_height;$source_x = ($source_width – $cropped_width) / 2;$source_y = 0;}// 源圖適中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, $cropped_height);// 縮放$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($cropped_image);}// 循環(huán)生成目錄function wpx_mkdir($dir, $mode = 0777){if (is_dir($dir) || @mkdir($dir, $mode)) {return true;}if (!wpx_mkdir(dirname($dir), $mode)) {return false;}return @mkdir($dir, $mode);}
通過上面的處理,我們就將圖片按照我們?cè)O(shè)置的尺寸進(jìn)行了裁剪。我們還可以定期對(duì)裁剪圖片進(jìn)行清理,這樣就不需要占用太多服務(wù)器空間。只有經(jīng)常訪問的圖片才會(huì)一直保存。
分享名稱:玩php你會(huì)圖像裁剪嗎創(chuàng)新互聯(lián)教你圖像裁剪服務(wù)器搭建
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