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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 $v; else return "$k," . mergeRecursive($v, $result); } } foreach(mergeRecursive($arr) as $v) echo $v . "\n";
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
one two Fatal error: Uncaught Error: Object of class Generator could not be converted to string in /in/GSDXb:27 Stack trace: #0 /in/GSDXb(34): mergeRecursive(Array) #1 {main} thrown in /in/GSDXb on line 27
Process exited with code 255.
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33
one two Recoverable fatal error: Object of class Generator could not be converted to string in /in/GSDXb on line 27
Process exited with code 255.
Output for 7.0.0 - 7.0.20
one two Catchable fatal error: Object of class Generator could not be converted to string in /in/GSDXb on line 27
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Fatal error: Generators cannot return values using "return" in /in/GSDXb on line 27
Process exited with code 255.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '$v' (T_VARIABLE) in /in/GSDXb on line 25
Process exited with code 255.

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