php二维数组除去重合数据

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Release: 2016-06-13 12:44:10
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php二维数组去除重合数据
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??????

PHP 二维数组
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