PHP array_reduce() function
Example
Send the values in the 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"));
?>
Definition and Usage
The array_reduce() function sends the values in the array to a user-defined function and returns a string.
Comment:If the array is empty and no value is passed initial Parameters, this function returns NULL.
Description
The array_reduce() function iteratively reduces an array to a single value using a callback function.
If the third parameter is specified, it will be treated as the first value in the array, or as the final return value if the array is empty.
Syntax
array_reduce(array,myfunction,initial)
| Parameters | Description |
|---|---|
| array | Required. Specifies the array. |
| myfunction | Required. Specifies the name of the function. |
| initial | Optional. Specifies the initial value sent to the function. |
Technical Details
| Return Value: | Return Result Value. |
| PHP Version: | 4.0.5+ |
| Update Log: | Since PHP 5.3.0,initial Parameters accept multiple types (mixed), versions prior to PHP 5.3.0 only support integers. |
More Examples
Example 1
Set initial Parameters:
<?php
function myfunction($v1,$v2)
{
return $v1 . "-" . $v2;
}
$a=array("Dog","Cat","Horse");
print_r(array_reduce($a,"myfunction",5));
?>
Example 2
Return Total:
<?php
function myfunction($v1,$v2)
{
return $v1+$v2;
}
$a=array(10,15,20);
print_r(array_reduce($a,"myfunction",5));
?>
