3v4l.org

run code in 300+ PHP versions simultaneously
<?php $is_php7 = false; if ( $is_php7 ) { function test_php7_synthax(): bool { return true; } } echo 'Done';
Output for 8.1.23 - 8.1.28, 8.2.10 - 8.2.19, 8.3.0 - 8.3.7
Done
Output for 5.6.40
Parse error: syntax error, unexpected ':', expecting '{' in /in/ER9XA on line 4
Process exited with code 255.
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55.96 ms | 401 KiB | 30 Q