3v4l.org

run code in 300+ PHP versions simultaneously
<?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()) { $helper = array_column($array, $index); foreach ($array as $k => $v) { if (is_array($v)) { $helper[] = recursiveArrayColumn($v, $index, $helper); } } } var_dump(recursiveArrayColumn($testArray, 'percy'));

preferences:
45.05 ms | 402 KiB | 5 Q