3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo ($foo, $bar = $foo) { var_dump($foo, $bar); } foo(42);
Output for 7.0.0 - 7.0.10
Fatal error: Constant expression contains invalid operations in /in/AnMFQ on line 3
Process exited with code 255.
Output for 5.6.0 - 5.6.25
Parse error: syntax error, unexpected '$foo' (T_VARIABLE) in /in/AnMFQ on line 3
Process exited with code 255.
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148.05 ms | 1237 KiB | 6 Q