3v4l.org

run code in 300+ PHP versions simultaneously
<?php function f_false():int|false{ // perfectly legal (php>=8) return false; } function f_true():int|true{ // .. Fatal error: Cannot use 'true' as class name return true; }
Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33
Fatal error: Cannot use 'true' as class name as it is reserved in /in/uD2LA on line 7
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Parse error: syntax error, unexpected '|', expecting '{' in /in/uD2LA on line 4
Process exited with code 255.
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