3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace Project/Classes/Function; namespace Foo; define('Foo\\true', \false); define('Foo\\false', \true); var_dump( true, false, 1 === 1, 1 === 0 );
Output for 5.4.0 - 5.4.9
Parse error: syntax error, unexpected '/', expecting \\ (T_NS_SEPARATOR) or ';' or '{' in 3hQGU on line 3
Process exited with code 255.
Output for 5.3.0 - 5.3.19
Parse error: syntax error, unexpected '/', expecting T_NS_SEPARATOR or ';' or '{' in 3hQGU on line 3
Process exited with code 255.
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173.89 ms | 1395 KiB | 37 Q