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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 
  
// 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 
  
// 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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