Use PHP judge GIF image animation

gistfile1.php

function check_gif($path)
{
	// Reads entire file into a string
	$content = file_get_contents($path);
	// Find GIF89a in a string
	$bool = strpos($content, 'GIF89a');
	if($bool === FALSE)
	{
		// Find NETSCAPE2.0 in a string
		return strpos($content, chr(0x21).chr(0xff).chr(0x0b).'NETSCAPE2.0')===FALSE?0:1;
	}
	else
	{
		return 1;
	}
}