PHP | Ds\Set filter() Function

Last Updated : 22 Aug, 2019

The Ds\Set::filter() function is an inbuilt function in PHP which is used to create new set using filter function. Syntax:

Ds\Set public Ds\Set::filter( $callback )

Parameters: This function accepts single parameter $callback which is optional and it returns True if the value should be included, False otherwise. Return value: This function returns a new set containing all the values for which either the callback returned True or all values that convert to True if a callback was not provided. Below programs illustrate the Ds\Set::filter() function in PHP: Program 1:

php

<?php   // Create new set  $set = new \Ds\Set([10, 20, 30, 40, 50]);   // Display new set using filter function  var_dump($set->filter(function($val) {      return $val % 4 == 0;  }));   ?>

Output:

  object(Ds\Set)#3 (2) {    [0]=>    int(20)    [1]=>    int(40)  }

Program 2:

php

<?php   // Create new set $set = new \Ds\Set([2, 5, 4, 8, 3, 9]);   // Display new set using filter function  var_dump($set->filter(function($val) {      return $val;  }));   ?>

Output:

  object(Ds\Set)#3 (6) {    [0]=>    int(2)    [1]=>    int(5)    [2]=>    int(4)    [3]=>    int(8)    [4]=>    int(3)    [5]=>    int(9)  }

Reference: https://www.php.net/manual/en/ds-set.filter.php

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