3v4l.org

run code in 300+ PHP versions simultaneously
<?php function bar(?$foo){ var_dump($foo); }
Output for 7.1.0 - 7.1.6
Parse error: syntax error, unexpected '$foo' (T_VARIABLE) in /in/ru0TH on line 3
Process exited with code 255.
Output for 7.0.0 - 7.0.20
Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in /in/ru0TH on line 3
Process exited with code 255.
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