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PHP | Ds\Sequence map() Function

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The Ds\Sequence::map() function is an inbuilt function in PHP which returns the result after applying callback function to each value. Syntax:
Ds\Sequence abstract public Ds\Sequence::map( $callback )
Parameter: This function accepts single parameter $callback. The callback apply on each value of sequence. Return Value: This function returns the callback after applying on each value. Below programs illustrate the Ds\Sequence::map() function in PHP: Program 1:
<?php
   
// Create new sequence
$seq new \Ds\Vector( [4, 8, 12, 16] );
  
// Use map() function and display it
var_dump($seq->map(function($val) { 
        return $val * 3; 
}));
   
?>

                    
Output:
object(Ds\Vector)#3 (4) {
  [0]=>
  int(12)
  [1]=>
  int(24)
  [2]=>
  int(36)
  [3]=>
  int(48)
}
Program 2:
<?php
   
// Create new sequence
$seq new \Ds\Vector([12, 15, 18, 20]);
  
// Use map() function and display it 
var_dump($seq->map(function($val) { 
        return $val / 3; 
}));
   
?>

                    
Output:
object(Ds\Vector)#3 (4) {
  [0]=>
  int(4)
  [1]=>
  int(5)
  [2]=>
  int(6)
  [3]=>
  float(6.6666666666667)
}
Reference: http://php.net/manual/en/ds-sequence.map.php

Last Updated : 21 Aug, 2019
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