改变图片尺寸
Posted 不弃初衷
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<?php /** * 图片缩放函数(可设置高度固定,宽度固定或者最大宽高,支持gif/jpg/png三种类型) * @param string $source_path 源图片 * @param int $target_width 目标宽度 * @param int $target_height 目标高度 * @param string $fixed_orig 锁定宽高(可选参数 width、height或者空值) * @return string */ function myImageResize($source_path, $target_width = 200, $target_height = 200, $fixed_orig = ‘‘){ $source_info = getimagesize($source_path); $source_width = $source_info[0]; $source_height = $source_info[1]; $source_mime = $source_info[‘mime‘]; $ratio_orig = $source_width / $source_height; //$fixed_orig随便填写,将强制按照填写的大小存储 if ($fixed_orig == ‘width‘){ //宽度固定 $target_height = $target_width / $ratio_orig; } elseif ($fixed_orig == ‘height‘){ //高度固定 $target_width = $target_height * $ratio_orig; } elseif ($fixed_orig === ‘‘) { //最大宽或最大高 if ($target_width / $target_height > $ratio_orig){ $target_width = $target_height * $ratio_orig; }else{ $target_height = $target_width / $ratio_orig; } } switch ($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, $target_height); imagecopyresampled($target_image, $source_image, 0, 0, 0, 0, $target_width, $target_height, $source_width, $source_height); $imgArr = explode(‘.‘, $source_path); $target_path = $imgArr[0] . ‘_new.‘ . $imgArr[1]; imagejpeg($target_image, $target_path, 100); imagedestroy($target_image); imagedestroy($source_image); } $filename= ‘1.jpg‘; myImageResize($filename, 200, 200, ‘free‘); //宽高200 ?>
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