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<?php $x = [ 'foo' => [], 'biz' => [ 'baz' => [] ] ]; var_dump(array_flatten($x));
based on 4MPEb
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Call to undefined function array_flatten() in /in/C03dq:8 Stack trace: #0 {main} thrown in /in/C03dq on line 8
Process exited with code 255.
Output for 5.4.10 - 5.6.28
Fatal error: Call to undefined function array_flatten() in /in/C03dq on line 8
Process exited with code 255.
Output for 5.3.20 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/C03dq on line 2
Process exited with code 255.