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php二维数组去除重合数据

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Release： 2016-06-23 14:14:46
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PHP 二维数组

Array
(
    [0] => Array
        (
            [knowledge_id] => 1
            [tag_id] => 2
        )

    [1] => Array
        (
            [knowledge_id] => 1
            [tag_id] => 3
        )

)

把他里面量相同的[knowledge_id] => 1合并只留一个？？？？？？

回复讨论(解决方案)

留哪个呢？还是2个 tag_id 都要？

不用只要一个数组[0] => Array
        (
            [knowledge_id] => 1
            [tag_id] => 2
        )

设原数组为 $ar, 则 

$res = array(); //结果数组foreach($ar as $v) {  if(! isset($res[$v['knowledge_id']])) $res[$v['knowledge_id']] = $v;}$res = array_values($res);
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