PHP 分类获取图片对象

/**
 * 分类获取图片对象
 */
function getImgCreateFrom($img_path)
{
    $ename = getimagesize($img_path);
    $ename = explode('/', $ename['mime']);
    $ext = $ename[1];
    switch ($ext) {
        case "png":
            
            $image = imagecreatefrompng($img_path);
            break;
        case "jpeg":
            
            $image = imagecreatefromjpeg($img_path);
            break;
        case "jpg":
            
            $image = imagecreatefromjpeg($img_path);
            break;
        case "gif":
            
            $image = imagecreatefromgif($img_path);
            break;
    }
    return $image;
}