PHP TO HEX

I have a php code i would like to convert to hex. When I check google, i only see how to decode hex codes to php but none to convert it back. Need someone who is good with all this PHP thingy to help. You can send me a pm or any how to contact you easily. Thank you

By hex I mean php with this kind of strings..

${"G\x4c\x4f\x42\x41L\x53"}["\x... bla bla bla..

Please mention your budget