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PHP | Ds\Sequence set() Function

Last Updated : 22 Aug, 2019
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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 
<?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 
<?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

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