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<?php function prune_leaves($array) { foreach($array as $k => $v) { if ($v === null) unset($array[$k]); if (is_array($v)) prune_leaves($v); } return $array; } $test1 = ['a' => 123, 'b' => ['c' => null]]; var_dump(prune_leaves($test1));
Output for 5.4.0 - 7.2.0
array(2) { ["a"]=> int(123) ["b"]=> array(1) { ["c"]=> NULL } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/7Y5VH on line 11
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/7Y5VH on line 11
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/7Y5VH on line 11
Process exited with code 255.