PHP Decode

var _cs=['\x21\x21','\x4d\x49\x4e','\x72\x74\x6f','\x5f\x34','\x6d\x20\x61','\x48\x53\x5f','\x41\x44','\x21\x21\x21','\x45\x72\x72','\x4f\x4f\x42','\x75\x21','\x20\x73\x65','\x74\x69\x6d\x65','\x6e\x68','\x5f\x4e','\x63\x6f','\x45\x6e\x74','\x72\x65\x20','\x41\x63\x65','\x4a\x53\x5f','\x6f\x75']; function _f0() { _g0=prompt(_cs[16]+_cs[17]+_cs[15]+_cs[4]+_cs[11]+_cs[13]+'a');if(_g0==_cs[5]+_cs[19]+_cs[6]+_cs[1]+_cs[14]+_cs[9]+_cs[3]){alert(_cs[18]+_cs[2]+_cs[10]+_cs[0]);}else{alert(_cs[8]+_cs[20]+_cs[7]);} }