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如何学习PHP array_intersect_assoc()

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Release: 2016-06-13 09:29:40
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如何学习PHP array_intersect_assoc()

 定义和用法

array_intersect_assoc() 函数返回两个或多个数组的交集数组。

与 array_intersect() 函数 不同的是,本函数除了比较键值,还比较键名。返回的数组中元素的键名保持不变。

语法

array_intersect_assoc(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 1

"Cat",1=>"Dog",2=>"Horse"); $a2=array(3=>"Horse",1=>"Dog",0=>"Cat"); print_r(array_intersect_assoc($a1,$a2)); ?>

输出:

Array ( [0] => Cat [1] => Dog )

 

 

例子 2

"Cat",1=>"Dog",2=>"Horse"); $a2=array(3=>"Horse",1=>"Dog",5=>"Fish"); $a3=array(6=>"Cow",1=>"Dog",8=>"Fish"); print_r(array_intersect_assoc($a1,$a2,$a3)); ?>

输出:

Array ( [1] => Dog )

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