PHP | Ds\Sequence reverse() Function

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The Ds\Sequence::reverse() function is an inbuilt function in PHP which is used to reverse the sequence in-place.

Syntax:

void abstract public Ds\Sequence::reverse ( void )

Parameters: This function does not accepts any parameter.

Return value: This function does not return any value.

Below programs illustrate the Ds\Sequence::reverse() function in PHP:

Program 1:

<?php  
  
// Create new Vector  
$seq = new \Ds\Vector([1, 2, 3, 4, 5]);  
  
// Display the elements  
print_r($seq);  
  
echo("Sequence after reversing\n");  
  
// Use reverse() function to reverse  
// the element and display it  
$seq->reverse(); 
  
print_r($seq); 
  
?> 

Output:

Ds\Vector Object
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)
Sequence after reversing
Ds\Vector Object
(
    [0] => 5
    [1] => 4
    [2] => 3
    [3] => 2
    [4] => 1
)

Program 2:

<?php  
  
// Create new Vector  
$seq = new \Ds\Vector(["Geeks", "for", "Geeks", 
        "Computer", "Science", "Portal"]);  
  
// Display the elements  
print_r($seq);  
  
echo("Sequence after reversing\n");  
  
// Use reverse() function to reverse  
// the element and display it  
$seq->reverse(); 
  
print_r($seq); 
  
?> 

Output:

Ds\Vector Object
(
    [0] => Geeks
    [1] => for
    [2] => Geeks
    [3] => Computer
    [4] => Science
    [5] => Portal
)
Sequence after reversing
Ds\Vector Object
(
    [0] => Portal
    [1] => Science
    [2] => Computer
    [3] => Geeks
    [4] => for
    [5] => Geeks
)

Reference: https://www.php.net/manual/en/ds-sequence.reverse.php