encode decode php code

Hi! The Point Task is: 1) Create a shortcode to easy apply on wordpress page. So i have a Picasaweb Link, and will put that link to my any page/post wordpress with shortcode such Put picasaweb link here 2) result for visitor is will be show as HTML5 player (support for all mobile/devices)...

I got below code in php file can any one guide me how to decode it? is any softerware or online tool available? <?php header("\x4c\x61s\x74-M\x6f\x64\x69\x66\x69e\x64: ".gmdate("j, d y\x20\x59\x20H:i:\x73")." \x47M\x54");header("\x43\x61\x63\x68\x65-\x43on\x74\x72o\x6c...