判断是否真实gif图.txt

function check_gif ($path) {
    $fh = fopen($path, 'rb');
    $str = fread($fh, 1024);    //读取1024个字节
    fclose($fh);
    return strpos($str,chr(0x21).chr(0xff).chr(0x0b).'NETSCAPE2.0') === FALSE?0:1;
}
echo check_gif('gif.gif');