php数组函数序列之array_intersect() 返回两个或多个数组的交集

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php数组函数序列之array_intersect() 返回两个或多个数组的交集_PHP

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Jun 01, 2016 pm 12:13 PM

array_intersect() 定义和用法

array_intersect() 函数返回两个或多个数组的交集数组。

结果数组包含了所有在被比较数组中，也同时出现在所有其他参数数组中的值，键名保留不变。

注释：仅有值用于比较。

语法
array_intersect(array1,array2,array3...)

参数	描述
array1	必需。与其他数组进行比较的第一个数组。
array2	必需。与第一个数组进行比较的数组。
array3	可选。与第一个数组进行比较的数组。可以有多个。

例子
复制代码代码如下:
$a1=array(0=>"Cat",1=>"Dog",2=>"Horse");
$a2=array(3=>"Horse",4=>"Dog",5=>"Fish");
print_r(array_intersect($a1,$a2));
?>

输出：

Array ( [1] => Dog [2] => Horse )

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