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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。
array_walk(array,function,parameter...) |
Parameter参数 | Description描述 |
---|---|
array | Required. Specifying an array 必要参数。指定一个数组 |
function | Required. The name of the user-made function 必要参数。指定用户自定义函数的名称 |
parameter | Optional. Specifies a parameter to the user-made function 可选参数。为用户自定义函数指定一个参数 |
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。
<?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 |
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 |
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 ) |