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<?php $arr = [ "one" => "one", "two" => "two", "group1" => [ "three" => "three", "four" => "four", "group2" => [ "five" => "five", ], ], "group3" => [ "six" => "six", ] ]; function mergeRecursive(array $array, $result = []) { foreach($array as $k => $v) { if(!is_array($array)) $result[] = $v; else $result[] = $k . mergeRecursive($v); } return $result; } $result = mergeRecursive($array); print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $array in /in/ZW9IO on line 35 Fatal error: Uncaught TypeError: mergeRecursive(): Argument #1 ($array) must be of type array, null given, called in /in/ZW9IO on line 35 and defined in /in/ZW9IO:22 Stack trace: #0 /in/ZW9IO(35): mergeRecursive(NULL) #1 {main} thrown in /in/ZW9IO on line 22
Process exited with code 255.

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