0, 'pre' => 2, 'next' => 6, ), array( 'id' => 1, 'pre' => 13, 'next' => 18, ), array( 'id' => 3, 'pre' => 3, 'next' => 8, ), array( 'id' => 4, 'pre' => 0, 'next' => 5, )); $all_pre = array_column($records, 'pre');//打印出所有的前驱节点print_r($all_pre);?>
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