PHP求某二维数组，某一列元素的最大最小值

<?php $box = array( 0 =>array( 'boxnum' => 1, 'record' => 66 ), 1 =>array( 'boxnum' => 2, 'record' => 66 ), 2 =>array( 'boxnum' => 3, 'record' => 66 ) )

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