3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace Foo; define('Foo\\true', \false); define('Foo\\false', \!true); var_dump( true, false, 1 === 1, 1 === 0 );
Output for 5.4.0 - 5.4.24
Parse error: syntax error, unexpected '!', expecting identifier (T_STRING) in /in/qg2uo on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected '!', expecting T_STRING in /in/qg2uo on line 4
Process exited with code 255.
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192.56 ms | 1395 KiB | 61 Q