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run code in 200+ php & hhvm versions
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<?php define('\true', false); if (\true) { echo "TRUE"; } else { echo "FALSE!!!"; }
Output for 5.3.0 - 7.1.7
TRUE
Output for 4.3.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/9IJJO on line 5 TRUE