Using array_push() to Append Elements to PHP Arrays

In PHP programming, arrays are a fundamental data structure, and adding new elements to the end of an existing array can be done quickly with the array_push() function. This article details the usage of array_push() and provides practical code examples.

The syntax of array_push() is:

array_push(array &$array, mixed $value1, mixed $value2, ...)

Parameter description: &$array: required, the array to which elements will be added. $value1, $value2, ...: required, one or more values to append to the array.

Example 1 – adding elements one by one:

<?php
// Create an empty array
$fruits = array();

// Add elements to the array
array_push($fruits, "apple");
array_push($fruits, "banana");
array_push($fruits, "orange");

// Output the array contents
print_r($fruits);
?>

Running the above code outputs:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
)

Example 2 – adding multiple elements at once:

<?php
$numbers = array(1, 2);

// Add several elements in a single call
array_push($numbers, 3, 4, 5);

print_r($numbers);
?>

The result is:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)

Note that array_push() returns the new length of the array after the elements are added. You can capture this return value as shown below:

<?php
$myArray = array(1, 2);

// Add elements and get the new length
$length = array_push($myArray, "a", "b", "c");

echo "New array length: " . $length;
?>

This script outputs:

New array length: 5

In summary, array_push() is a convenient PHP function that allows you to quickly append one or more elements to the end of an array, returning the updated array length, which helps simplify code and improve development efficiency.