PHP array_reduce() function

The array_reduce() function is a inbuilt function of PHP. The array_reduce( ) function is used to reduce the array to a single value using a callback function. This function was introduced in PHP 4.0.5.

Syntax

mixed array_reduce ( array $array , callable $callback [, mixed $initial = NULL ] );

Parameter

Parameter	Description	Is compulsory
array	Specifies an array.	compulsory
User defined function	User supplied function to accept values from the array.	compulsory
Initial_value	Initial value to send to the function.	Optional

Return type

The array_reduce( ) function returns the reduced result. It can be of any type int, float or string.

Example 1

<?php
function userfunction($x1,$x2)
{
return $x1 . "-" . $x2;
}
$a=array("PHP","java","python");
print_r(array_reduce($a,"userfunction",6));
?>

Output:

6-PHP-java-python

Example 2

<?php
function add($x, $y)
{
$x += $y;
return $x;
}
$a = array(1,2,3,4,5,6);
$x=array_reduce($a,"add");
echo $x;
?>

Output:

Example 3

<?php
function myfunction($x1, $x2)
{
return $x1 . " and " . $x2;
}
$array = array(15, 120, 45, 320);
print_r(array_reduce($array, "myfunction", "start"));
?>

Output:

start and 15 and 120 and 45 and 320

Example 4

<?php
function myfunction($n1, $n2)
{
		$n1 = $n1 * $n2;
return $n1;
}
$array = array(2, 4, 5, 10, 100);
print_r(array_reduce($array, "myfunction", "3"));
?>

Output:

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