Online PHP editor | refs for U8Re6

<?php $array = array( 0 => array( 'key1' => '123', 'key2' => 'values we', 'key3' => 'do not', 'key4' => 'care about' ), 1 => array( 'key1' => '124', 'key2' => 'values we', 'key3' => 'do not', 'key4' => 'care about' ), 2 => array( 'key1' => '125', 'key2' => 'values we', 'key3' => 'do not', 'key4' => 'care about' ) ); echo max(array_column($array, 'key1'));