PHP | Ds\Sequence set() Function

The Ds\Sequence::set() function is an inbuilt function in PHP which is used to updates a value at a given index.

Syntax:

void abstract public Ds\Sequence::set ( int $index , mixed $value )

Parameters: This function accepts two parameters as mentioned above and described below:

• $index: It is used to hold the index number where value of sequence to be updated.
• $value: It is used to hold the new value which to be update at given index.

Return value: This function does not return any value.

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

Program 1:

<?php

// Create new Sequence
$seq = new \Ds\Vector([1, 2, 3, 4, 5]);

echo("Original Sequence\n");

// Display the Sequence elements
print_r($seq);

// Use set() function to update
// the sequence elements
$seq->set(2, "Geeks");

echo("\nSequence after updating the elements\n");

// Display the Sequence elements
print_r($seq);

?>

Output:

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

Sequence after updating the elements
Ds\Vector Object
(
    [0] => 1
    [1] => 2
    [2] => Geeks
    [3] => 4
    [4] => 5
)

Program 2:

<?php

// Create new Sequence
$seq = new \Ds\Vector(["Geeks", "for", "Geeks",
        "Computer", "Science", "Portal"]);

echo("Original Sequence\n");

// Display the Sequence elements
print_r($seq);

// Use set() function to set
// the sequence elements
$seq->set(0, "Welcome");
$seq->set(1, "to");
$seq->set(2, "GeeksforGeeks");

echo("\nSequence after updating the elements\n");

// Display the Sequence elements
print_r($seq);

?>

Output:

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

Sequence after updating the elements
Ds\Vector Object
(
    [0] => Welcome
    [1] => to
    [2] => GeeksforGeeks
    [3] => Computer
    [4] => Science
    [5] => Portal
)

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