PHP array_reduce() Function

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"));
?>

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.

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

Return Value:	Returns the resulting value
PHP Version:	4.0.5+
PHP Changelog:	As of PHP 5.3.0, the initial parameter accepts multiple types (mixed). Versions prior to PHP 5.3.0, only allowed integer.

With the initial parameter:

<?php
function myfunction($v1,$v2)
{
return $v1 . "-" . $v2;
}
$a=array("Dog","Cat","Horse");
print_r(array_reduce($a,"myfunction",5));
?>

Returning a sum:

<?php
function myfunction($v1,$v2)
{
return $v1+$v2;
}
$a=array(10,15,20);
print_r(array_reduce($a,"myfunction",5));
?>