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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 => $v) { if(!is_array($v)) yield $v; else yield "$k," . mergeRecursive($v, $result); } } foreach(mergeRecursive($arr) as $v) echo $v . "\n";
Output for git.master, git.master_jit, rfc.property-hooks
one two Fatal error: Uncaught Error: Object of class Generator could not be converted to string in /in/NMGdN:27 Stack trace: #0 /in/NMGdN(34): mergeRecursive(Array) #1 {main} thrown in /in/NMGdN on line 27
Process exited with code 255.

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