PHP array_walk () function
Examples
Each element in the array application user-defined function:
<?php
function myfunction($value,$key)
{
echo "The key $key has the value $value<br>";
}
$a=array("a"=>"red","b"=>"green","c"=>"blue");
array_walk($a,"myfunction");
?>
function myfunction($value,$key)
{
echo "The key $key has the value $value<br>";
}
$a=array("a"=>"red","b"=>"green","c"=>"blue");
array_walk($a,"myfunction");
?>
Running instance »
Definition and Usage
array_walk () function for each element in the array apply user-defined functions. In the function, the array of key names and values are parameters.
Note: You can use the user-defined function in the first parameter specified as a reference: & $ value, to change the value of array elements (see Example 2).
Tip: To operate a deeper array (an array that contains another array), use array_walk_recursive () function.
grammar
array_walk( array,myfunction,parameter... )
| 参数 | 描述 |
|---|---|
| array | 必需。规定数组。 |
| myfunction | 必需。用户自定义函数的名称。 |
| parameter,... | 可选。规定用户自定义函数的参数，您可以为函数设置一个或多个参数。 |
technical details
| return value: | If successful it returns TRUE, otherwise returns FALSE. |
|---|---|
| PHP version: | 4+ |
More examples
Example 1
With a parameter:
<?php
function myfunction($value,$key,$p)
{
echo "$key $p $value<br>";
}
$a=array("a"=>"red","b"=>"green","c"=>"blue");
array_walk($a,"myfunction","has the value");
?>
function myfunction($value,$key,$p)
{
echo "$key $p $value<br>";
}
$a=array("a"=>"red","b"=>"green","c"=>"blue");
array_walk($a,"myfunction","has the value");
?>
Running instance »
Example 2
Change the value of array elements (note & $ value):
<?php
function myfunction(&$value,$key)
{
$value="yellow";
}
$a=array("a"=>"red","b"=>"green","c"=>"blue");
array_walk($a,"myfunction");
print_r($a);
?>
function myfunction(&$value,$key)
{
$value="yellow";
}
$a=array("a"=>"red","b"=>"green","c"=>"blue");
array_walk($a,"myfunction");
print_r($a);
?>
Running instance »
Complete PHP Array Reference