Example
Send the values in an array to a user-defined function and return a string:
<?php
function myfunction($v1,$v2)
{
return $v1 . "-" . $v2;
}
$a=array("Dog","Cat","Horse");
print_r(array_reduce($a,"myfunction"));
?>
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Definition and Usage
The array_reduce() function sends the values in an array to a user-defined function, and returns a string.
Note: If the array is empty and initial is not passed, this function returns NULL.
Syntax
array_reduce(array,myfunction,initial)
| Parameter | Description |
|---|---|
| array | Required. Specifies an array |
| myfunction | Required. Specifies the name of the function |
| initial | Optional. Specifies the initial value to send to the function |
Technical Details
| Return Value: | Returns the resulting value |
|---|---|
| PHP Version: | 4.0.5+ |
| Changelog: | As of PHP 5.3.0, the initial parameter accepts multiple types (mixed). Versions prior to PHP 5.3.0, only allowed integer. |
More Examples
Example 1
With the initial parameter:
<?php
function myfunction($v1,$v2)
{
return $v1 . "-" . $v2;
}
$a=array("Dog","Cat","Horse");
print_r(array_reduce($a,"myfunction",5));
?>
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Example 2
Returning a sum:
<?php
function myfunction($v1,$v2)
{
return $v1+$v2;
}
$a=array(10,15,20);
print_r(array_reduce($a,"myfunction",5));
?>
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< PHP Array Reference