首页 / 网页编程 / PHP / PHP实现图片不变型裁剪及图片按比例裁剪的方法

<?php/** * imageCropper * @param string $source_path * @param string $target_width * @param string $target_height */function imageCropper（$source_path, $target_width, $target_height）{$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 / $target_width;if （$source_ratio > $target_ratio）{// image-to-height$cropped_width = $source_width;$cropped_height = $source_width * $target_ratio;$source_x = 0;$source_y = （$source_height - $cropped_height） / 2;}elseif （$source_ratio < $target_ratio）{//image-to-widht$cropped_width = $source_height / $target_ratio;$cropped_height = $source_height;$source_x = （$source_width - $cropped_width） / 2;$source_y = 0;}else{//image-size-ok$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 ;break;}$target_image = imagecreatetruecolor（$target_width, $target_height）;$cropped_image = imagecreatetruecolor（$cropped_width, $cropped_height）;// copyimagecopy（$cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height）;// zoomimagecopyresampled（$target_image, $cropped_image, 0, 0, 0, 0, $target_width, $target_height, $cropped_width, $cropped_height）;header（"Content-Type: image/jpeg"）;imagejpeg（$target_image）;imagedestroy（$source_image）;imagedestroy（$target_image）;imagedestroy（$cropped_image）;}$filename = "8fcb7a0831b79c61.jpg";imageCropper（$filename,200,200）;?>

<?php/** * imageZoom * @param string $file * @param double $zoom */function imageZoom（$filename,$zoom=0.6）{//baseinfo$sourceImageInfo = getimagesize（$filename）;$sourceWidth = $sourceImageInfo[0];$sourceHeight = $sourceImageInfo[1];$sourceMine = $sourceImageInfo["mime"];$sourceRatio = $sourceWidth/$sourceHeight;$sourceX = 0;$sourceY = 0;//zoom$targetRatio = $zoom;//target-widht-height$targetWidth = $sourceWidth*$targetRatio;$targetHeight = $sourceHeight*$targetRatio;//init-params$sourceImage = null;switch（$sourceMine）{case "image/gif":$sourceImage = imagecreatefromgif（$filename）;break;case "image/jpeg":$sourceImage = imagecreatefromjpeg（$filename）;break;case "image/png":$sourceImage = imagecreatefrompng（$filename）;break;default:return ;break;}//temp-target-image$tempSourceImage = imagecreatetruecolor（$sourceWidth, $sourceHeight）;$targetImage = imagecreatetruecolor（$targetWidth,$targetHeight）;//copyimagecopy（$tempSourceImage, $sourceImage, 0, 0, $sourceX, $sourceY, $sourceWidth, $sourceHeight）;//zoomimagecopyresampled（$targetImage, $tempSourceImage, 0, 0, 0, 0, $targetWidth, $targetHeight, $sourceWidth, $sourceHeight）;//headerheader（"Content-Type: image/jpeg"）;//image-loadingimagejpeg（$targetImage）;//destroyimagedestroy（$tempSourceImage）;imagedestroy（$sourceImage）;imagedestroy（$targetImage）;}$filename = "8fcb7a0831b79c61.jpg";imageZoom（$filename）;?>