3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var = array( 'a' => 'a', 'b' => 'b', ); array_walk($var, function(value){ }); var_dump(key($var));
Output for 5.6.8 - 5.6.17, 7.0.0 - 7.0.2
Parse error: syntax error, unexpected ')', expecting variable (T_VARIABLE) in /in/LAhFv on line 8
Process exited with code 255.
Output for 5.5.24 - 5.5.31
Parse error: syntax error, unexpected ')', expecting '&' or variable (T_VARIABLE) in /in/LAhFv on line 8
Process exited with code 255.
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163.54 ms | 1395 KiB | 28 Q