一段很另类的Hello world!

define(_,'chr(');

define(__,').');

define(___,"print ");

define(____,"'!';");

define(_____,_."0x48".__._."0x65".__._."0x6C".__._."0x6C".__);

define(______,_."0x6F".__._."0x20".__._."0x77".__._."0x6F".__);

define(_______,_."0x72".__._."0x6C".__._."0x64".__);

define(________,_____.______._______);

define(_________,___.________.____);

eval(_________);