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What is the Ds\Vector remove() function in PHP?

Hammad Nasir

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

Overview

The Vector class in PHP is an array that is automatically resized. The elements of a Vector instance are accessible via indexes.

This shot discusses the remove method of the Vector class.

The remove method removes an element from the Vector at the specified $index argument and returns the removed element.

Syntax

<?php
public Ds\Vector::remove(int $index): mixed
?>

Parameters

  • $index is an integer that specifies the index of the Vector to be removed.

Return value

  • The value that is removed is returned.

Exceptions

  • OutOfRangeException is thrown if the index is not valid (e.g., is not in range).

Example

<?php
$vec = new \Ds\Vector(["A", "B", "C"]);
print_r("Vector before remove call: ");
foreach ($vec as $elem) {
print_r($elem." ");
}
print_r("\n");
print_r("Element removed from index 1: ".$vec->remove(1));
print_r("\n");
print_r("Vector after remove call: ");
foreach ($vec as $elem) {
print_r($elem." ");
}
print_r("\n");
?>

Output:

Vector before remove call: A B C
Element removed from index 1: B
Vector after remove call: A C 

To run this program, you need to install Data Structures for PHP on your local machine.

A new Vector is initialized and stored in the $vec variable in the example above. $vec consists of A, B, and C. The $vec->remove(1) expression invokes the remove method with the $index value of 1 over the $vec variable, resulting in the removal of element B from $vec. Moreover, the remove method call also returns this removed element, B.

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Hammad Nasir
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Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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