<?php define("DEFINE",1); define("HELLO", 'this_exists'); define("this_doesnt_exist", "HELLO"); $var = 12349394; $vvar = "this_doesnt_exist"; var_dump( defined("DEFINE"), defined(DEFINE), defined($var), defined("Hi"), $var, DEFINE, defined("HELLO"), defined(this_doesnt_exist), defined($vvar) );
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