Decript php code

I bought a simple php cart program that i was told i could modify but once i paid for it it has been encripted i only interested in adding my own addons to the sript nothing else i think encripted with base 64 ? not sure i have also been told a 1 line program will decript the code is so, can someone either decode all my scripts in the programe or write a simple program to do it. i have enclosed a sample index encripted page.

<?php $_F=__FILE__;$_X='P0ZOPzM1Mw05DTl0dzdVWXR3X1QuZ3coIlM4VHR3X2dJXVNTeTM1MyIpOw05DTkJDTkNOQlZZCgkNVRrd18zXWp3RG9vREMpRG0NOQ05CQk1d11hd3QoIn1UZ104WVQuOkQiRHkkYVl0XzNdODV5RCJ7Z1QuOHcuOHkzNTMiKTsNOQkJd2NZODsNOQkxDTkJd0lTd0RtDTkNOQkJNXddYXd0KCJ9VGddOFlULjpEIkR5JGFZdF8zXTg1eUQie1M4VHR3eTM1MyIpOw05CQl3Y1k4Ow05CTENOQ05P0Y=';$_D=strrev('edoced_46esab');eval($_D('JF9YPWJhc2U2NF9kZWNvZGUoJF9YKTskX1g9c3RydHIoJF9YLCdTSFkvcTFSeklkVWZYNHhhVkYKW0F5Y017T0xoQ3VnNTNiV3JLPC4+MiA3R0VsVH1tc3Y2RD1vbmlRazhCdHdwakplWjlQMF1OJywnc09pUFJ9TktsZnVFWTJ3ZDg+SkJrLnh6L3ZdSDFDY2hwWlhRQTVuUzBXcTk3NG9Me2JbeSBJPVZGTW10anJlR2dEVFUKNjNhPCcpOyRfUj1lcmVnX3JlcGxhY2UoJ19fRklMRV9fJywiJyIuJF9GLiInIiwkX1gpO2V2YWwoJF9SKTskX1I9MDskX1g9MDs='));?>

this is just 1 page there are about 70 pages

thank you

JavaScript PHP Segurança na rede

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