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                [PHP array_unique() 函數](http://www.w3school.com.cn/php/func_array_unique.asp) #### 定義和用法 array_unique() 函數移除數組中的重復的值,并返回結果數組。 當幾個數組元素的值相等時,只保留第一個元素,其他的元素被刪除。 返回的數組中鍵名不變。 **注釋**:被保留的數組將保持第一個數組項的鍵名類型。 ~~~ $a=array("a"=>"red","b"=>"green","c"=>"red"); $b=array("1"=>"red","2"=>"green","3"=>"red"); $c=array_unique(array_merge($a,$b)); print_r(array_unique($a)); print_r(array_unique($b)); print_r(array_unique($c)); ~~~ Array ( [a] => red [c] => blue [b] => yellow ) Array ( [a] => red [b] => green ) Array ( [1] => red [2] => green ) Array ( [0] => red [1] => green ) * * * * * 思路: 交集:將兩個數組串接到一個數組然后通過array_unique(),array_merge()等函數合并排序。
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