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<?php $testArray = array( 'percy' => array( 'philip' => array( 'mitch' => array( 'percy' => 'hatcherson', 'mitch' => 'anderson' ) ), 'mitch' => array( 'mitchell', 'anderson', 'percy' => array( 'percy', 'hatcherson' ), 'mitchell' => 'thomas mitchell anderson', 'percy' => 'percy philip hatcherson' ) ) ); $newArray = array(); function recursiveArrayColumn ($array, $index, $helper = array()) { $helper = array_column($v, $index); foreach ($array as $k => $v) { if (is_array($v)) { $helper[] = recursiveArrayColumn($v, $index, $helper); } } } var_dump(recursiveArrayColumn($testArray, 'percy'));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $v in /in/84AbK on line 28 Fatal error: Uncaught TypeError: array_column(): Argument #1 ($array) must be of type array, null given in /in/84AbK:28 Stack trace: #0 /in/84AbK(28): array_column(NULL, 'percy') #1 /in/84AbK(42): recursiveArrayColumn(Array, 'percy') #2 {main} thrown in /in/84AbK on line 28
Process exited with code 255.

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