php实现按照指定的尺寸像素压缩到指定路径图片源码
- /**
- * * 按照指定的尺寸压缩图片
- * * @param $source_path 原图路径
- * * @param $imgWidth 目标宽度
- * * @param $imgHeight 目标高度
- * * @return bool|string
- */
- function resize_image($source_path, $imgWidth, $imgHeight)
- {
- $source_info = getimagesize($source_path);
- $source_mime = $source_info['mime'];
- switch ($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;
- }
- $target_image = imagecreatetruecolor($imgWidth, $imgHeight); //创建一个彩色的底图
- imagecopyresampled($target_image, $source_image, 0, 0, 0, 0, $imgWidth, $imgHeight, $source_info[0], $source_info[1]);
- if(!imagejpeg($target_image, $source_path)){
- $source_path = '';
- }
- imagedestroy($target_image);
- return $source_path;
- }
