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PHP | Ds\Vector filter() Function
  • Last Updated : 22 Aug, 2019

The Ds\Vector::filter() function is used to filter out the only elements which satisfy the condition defined in the callback function. After doing a filter on the vector, it will eliminate the elements which do not satisfy the condition mentioned in the function.

Syntax:

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

Parameters: This function accepts single parameter $callback which returns true if the element in the vector is to be included, else return false.

Return Value: This function returns the vector with all the elements which are filtered according to the callable function.

Below programs illustrate the Ds\Vector::filter() function in PHP:



Program 1:




<?php
  
// Create new vector element
$vector = new \Ds\Vector([1, 2, 3, 4, 5]);
  
echo "Original Vector elements\n";
  
// Display the vector element
var_dump($vector);
  
echo("\nElements greater than or equal to 4\n");
  
// Filter the vector element
var_dump($vector->filter(function($value) {
    return $value >= 4;
}));
  
?>

Output:

Original Vector elements
object(Ds\Vector)#1 (5) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
  [4]=>
  int(5)
}

Elements greater than or equal to 4
object(Ds\Vector)#3 (2) {
  [0]=>
  int(4)
  [1]=>
  int(5)
}

Program 2:




<?php
  
// Create new vector element
$vector = new \Ds\Vector([1, 2, 3, 4, 5]);
  
echo "Original Vector elements\n";
  
// Display the vector element
var_dump($vector);
  
echo("\nOdd elements\n");
  
// Use filter() function to filter
// the vector element
var_dump($vector->filter(function($value) {
    return $value % 2 == 1;
}));
  
?>

Output:

Original Vector elements
object(Ds\Vector)#1 (5) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
  [4]=>
  int(5)
}

Odd elements
object(Ds\Vector)#3 (3) {
  [0]=>
  int(1)
  [1]=>
  int(3)
  [2]=>
  int(5)
}

Reference: http://php.net/manual/en/ds-vector.filter.php

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