Definition and Usage
定义和用法

The array_walk() function runs each array element in a user-made function. The array's keys and values are parameters in the function. Returns True or False
array_walk()函数将一个数组中的元素应用于用户自定义函数中；该数组中的键和值作为用户自定义函数中的参数。

Syntax
语法

array_walk(array,function,parameter...)

Tips and Notes
提示和注意点

Tip: You can assign one parameter to the function, or as many as you like.
提示：你可以向函数中指定一个或多个参数。

Note: You can change an array element's value in the user-made function by specifying the first parameter as a reference: &$value. (See example 3)
注意：你可以在用户自定义函数的第一个参数中指定“&$value”来改变原数组元素的值。

Example 1
案例1

<?php
function myfunction($value,$key)
{
echo "The key $key has the value $value<br />";
}
$a=array("a"=>"Cat","b"=>"Dog","c"=>"Horse");
array_walk($a,"myfunction");
?>

The output of the code above will be:
上述代码将输出下面的结果：

The key a has the value Cat
The key b has the value Dog
The key c has the value Horse

Example 2
案例2

With a parameter:
附带参数的情况如下：

<?php
function myfunction($value,$key,$p)
{
echo "$key $p $value<br />";
}
$a=array("a"=>"Cat","b"=>"Dog","c"=>"Horse");
array_walk($a,"myfunction","has the value");
?>

The output of the code above will be:
上述代码将输出下面的结果：

a has the value Cat
b has the value Dog
c has the value Horse

Example 3
案例3

Change an array element's value. (Notice the &$value)
改变一个数组中元素的值（特别注意“&$value”）：

<?php
function myfunction(&$value,$key)
{
$value="Bird;
}
$a=array("a"=>"Cat","b"=>"Dog","c"=>"Horse");
array_walk($a,"myfunction");
print_r($a);
?>

The output of the code above will be:
上述代码将输出下面的结果：

Array ( [a] => Bird [b] => Bird [c] => Bird )

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