<?php $array = array( 0 => array( '1' => '123', '2' => '120', '3' => '30', '4' => '150' ), 1 => array( '1' => '123', '2' => '122', '3' => '30', '4' => '158' ), 2 => array( '1' => '123', '2' => '129', '3' => '300', '4' => '150' ) ); $a = array_merge(...$array); print_r($a); echo max($a);
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