PHP

PHP

πŸ“€ PHP array_pop() Function: Removing the Last Element

The array_pop() function in PHP removes and returns the last element off the end of an array. It shortens the target array by one element and resets array pointers.

  • Return Value: array_pop() returns the removed value. If the array is empty, it returns null.

πŸ› οΈ Basic Syntax & Usage

Pass an array variable to array_pop() to strip its final value:

PHP
$stack = ["HTML", "CSS", "JavaScript", "PHP"];

// Pop the last element off the end
$lastItem = array_pop($stack);

echo "Popped Element: " . $lastItem; // Outputs: Popped Element: PHP

print_r($stack);
/*
Output:
Array
(
    [0] => HTML
    [1] => CSS
    [2] => JavaScript
)
*/

πŸ”„ Stack (LIFO) Operations with PHP

Combining array_push() and array_pop() allows you to easily implement a standard Last-In, First-Out (LIFO) stack data structure in PHP.

PHP
$actions = [];

// Push items onto stack
array_push($actions, "Page 1");
array_push($actions, "Page 2");

// Undo action (Pop last item)
$previousPage = array_pop($actions); // "Page 2"

echo "Current Page: " . end($actions); // Outputs: Page 1

πŸ“‹ Key Rules & Behaviors

  • 1. Direct Mutation: Like array_push(), array_pop() modifies the source array directly by reference.
  • 2. Indexing Behavior: Numeric keys are re-indexed consecutively, while associative string keys are cleanly removed without affecting other key pairs.
  • 3. Empty Array Handling: Calling array_pop() on an empty array silently returns null without raising an error.

πŸ“Š Array End Stack Operations Comparison

Function Action Target Position Return Value
array_push() Adds element(s) End of array New total element count
array_pop() Removes element End of array The removed element value (or null)

  • πŸ“ Short Summary

  • array_pop() extracts and removes the final element from an array.
  • It directly modifies the source array variable passed into the function.
  • Use array_pop() in combination with array_push() to build LIFO stacks.
PHP array_push()
PHP array_shift()