The role of the array_filter() function in PHP is to filter the elements in the array and return the filtered new array

The array_filter() function filters the elements of an array using a user-created callback function. It returns the filtered array.

Syntax

array_filter(arr, callback, flag)

Parameters

• arr - The array to be filtered

• callback - The callback function to use

• flag - Parameters sent to the callback function:

  >

  • ARRAY_FILTER_USE_KEY - Pass the key as the only argument to the callback instead of the value

  • ARRAY_FILTER_USE_BOTH - Pass both the value and the key as arguments Passed to the callback instead of the value

Returns

array_filter() function returns the filtered array.

Example

Real-time demonstration

<?php
function check($arr) {
   return(!($arr & 1));
}
$arr1 = array(3, 6, 9, 15, 20, 30, 45, 48, 59, 66);
print_r(array_filter($arr1, "check"));
?>

Output

Array
(
[1] => 6
[4] => 20
[5] => 30
[7] => 48
[9] => 66
)

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