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array_reduce() function in PHP
The array_reduce() function returns an array as a string, using a user-defined function.
Syntax
array_reduce(arr, custom_func, initial)
Parameters
- arr − The array. Required.
- custom_func − The name of the user-defined function. Required.
- initial − Initial value to be sent to the function. Optional.
Return
The array_reduce() function returns the resulting value. It returns NULL, if the array is an empty array and initial isn’t passed.
Example
The following is an example −
<?php
function display($a1,$a2) {
return $a1 . " DEMO " . $a2;
}
$a = array("One","Two");
print_r(array_reduce($a,"display",2));
?>Output
The following is the output −
2 DEMO One DEMO Two
Example
Let us see another example wherein the given array is reduced o the product of all the elements of the array −
<?php
function display($a1,$a2) {
return $a1 + $a2;
}
$arr = array(50, 100, 150, 200, 250);
print_r(array_reduce($arr,"display",500));
?>Output
The following is the output −
1250
Updated on: 24-Jun-2020
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