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PHP | Ds\Sequence apply() Function

Last Updated : 21 Aug, 2019
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The Ds\Sequence::apply() function is an inbuilt function in PHP which is used to updates all value of sequence by applying a callback function to each value. Syntax: 
void abstract public Ds\Sequence::apply ( callable $callback )
Parameter: This function accepts single parameter $callback which is used to apply to each value in the sequence. Return value: This function does not return any parameters. Below programs illustrate the Ds\Sequence::apply() function in PHP: Program 1: php 
<?php 

// Create new sequence 
$seq = new \Ds\Vector([10, 20, 30, 40, 50]); 

// Use apply() function
$seq->apply(function($val) { 
    return $val / 5; 
}); 

// Display result
print_r($seq);

?>
Output: 
Ds\Vector Object
(
    [0] => 2
    [1] => 4
    [2] => 6
    [3] => 8
    [4] => 10
)
Program 2: php 
<?php 

// Create new sequence 
$seq = new \Ds\Vector([2, 3, 5, 6, 8]); 

// Use apply() function
$seq->apply(function($val) { 
    return $val; 
}); 

// Display result
var_dump($seq);

?>
Output: 
object(Ds\Vector)#1 (5) {
  [0]=>
  int(2)
  [1]=>
  int(3)
  [2]=>
  int(5)
  [3]=>
  int(6)
  [4]=>
  int(8)
}
Reference: https://www.php.net/manual/en/ds-sequence.apply.php

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