PHP | Ds\Set slice() Function

The Ds\Set::slice() function is an inbuilt function in PHP which is used to return the sub-set of given range.

Syntax:

Ds\Set public Ds\Set::slice ( int $index [, int $length ] )

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

• $index: This parameter holds the starting index of sub-set. The index value can be positive and negative. If the index value is positive then it starts at the index of the set and if the index value is negative then set starts from ends.
• $length: This parameter holds the length of sub-set. This parameter can take positive and negative values. If length is positive then sub-set size is equal to a given length and if the length is negative then the set will stop that many values from the end.

Return Value: This function returns the sub-set of given range.

Below programs illustrate the Ds\Set::slice() function in PHP:

Program 1:

<?php

// Create new set
$set = new \Ds\Set([1, 3, 6, 9, 10, 15, 20]);

// Use slice() function to create
// sub-set and display it
print_r($set->slice(2));

print_r($set->slice(1, 2));

print_r($set->slice(2, -2));

?>

Output:

Ds\Set Object
(
    [0] => 6
    [1] => 9
    [2] => 10
    [3] => 15
    [4] => 20
)
Ds\Set Object
(
    [0] => 3
    [1] => 6
)
Ds\Set Object
(
    [0] => 6
    [1] => 9
    [2] => 10
)

Program 2:

<?php

// Create new set
$set = new \Ds\Set(["Geeks", "GFG", "Abc", "for"]);

// Use slice() function to create
// sub-set and display it
print_r($set->slice(3));

print_r($set->slice(2, 0));

print_r($set->slice(0, 3));

?>

Output:

Ds\Set Object
(
    [0] => for
)
Ds\Set Object
(
)
Ds\Set Object
(
    [0] => Geeks
    [1] => GFG
    [2] => Abc
)

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