<?php $array = [ 'xx' => range(1, 10), 'yy' => range(1, 4), 'zz' => range(1, 6) ]; $length = max(array_map('count', $array)); $array = array_map( function (array $a) use ($length) { return array_pad($a, $length, null); }, $array ); print_r($array);
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