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<?php $array = array( array("title" => 1, "children" => array( array( "selected" => true, "key" => 12345, "children" => array() ) ) ) ); $selectedValues = array(); $iterator = new \RecursiveIteratorIterator(new \RecursiveArrayIterator($tree)); foreach ($iterator as $key => $value) { if ($key == "selected" && $value) { $selectedValues[] = $iterator["key"]; } } var_dump($selectedValues);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined variable $tree in /in/bQ5sK on line 13 Fatal error: Uncaught TypeError: ArrayIterator::__construct(): Argument #1 ($array) must be of type array, null given in /in/bQ5sK:13 Stack trace: #0 /in/bQ5sK(13): ArrayIterator->__construct(NULL) #1 {main} thrown in /in/bQ5sK on line 13
Process exited with code 255.
Output for 7.0.20, 7.1.5 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: tree in /in/bQ5sK on line 13 Fatal error: Uncaught InvalidArgumentException: Passed variable is not an array or object in /in/bQ5sK:13 Stack trace: #0 /in/bQ5sK(13): ArrayIterator->__construct(NULL) #1 {main} thrown in /in/bQ5sK on line 13
Process exited with code 255.
Output for 7.3.32 - 7.3.33
Fatal error: Uncaught InvalidArgumentException: Passed variable is not an array or object in /in/bQ5sK:13 Stack trace: #0 /in/bQ5sK(13): ArrayIterator->__construct(NULL) #1 {main} thrown in /in/bQ5sK on line 13
Process exited with code 255.
Output for 7.0.0 - 7.0.6, 7.1.0
Notice: Undefined variable: tree in /in/bQ5sK on line 13 Fatal error: Uncaught InvalidArgumentException: Passed variable is not an array or object, using empty array instead in /in/bQ5sK:13 Stack trace: #0 /in/bQ5sK(13): ArrayIterator->__construct(NULL) #1 {main} thrown in /in/bQ5sK on line 13
Process exited with code 255.
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Notice: Undefined variable: tree in /in/bQ5sK on line 13 Fatal error: Uncaught exception 'InvalidArgumentException' with message 'Passed variable is not an array or object, using empty array instead' in /in/bQ5sK:13 Stack trace: #0 /in/bQ5sK(13): ArrayIterator->__construct(NULL) #1 {main} thrown in /in/bQ5sK on line 13
Process exited with code 255.
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