3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace foo { const true = \false; const false = \true; } namespace { use const foo\true; use const foo\false; var_dump(false, true); }
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.32
Fatal error: Cannot redeclare constant 'true' in /in/Wr6rN on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_STRING in /in/Wr6rN on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/Wr6rN on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Wr6rN on line 3
Process exited with code 255.
preferences:
224.54 ms | 1395 KiB | 123 Q