How to Push Both Key and Value into PHP Array ?
Given an array, the task is to push a new key and value pair into the array. There are some methods to push value and key into the PHP array, these are:
Table of Content
Approach 1: Using Square Bracket [] Syntax
A value can be directly assigned to a specific key by using the square bracket syntax.
Example:
<?php
$myArray = [
"1" => "GeeksforGeeks",
"2" => "GFG",
"3" => "Learn, Practice, and Excel",
];
$myArray["4"] = "PHP";
foreach ($myArray as $keyName => $valueName) {
echo $keyName . " => " . $valueName . "\n";
}
?>
Output
1 => GeeksforGeeks 2 => GFG 3 => Learn, Practice, and Excel 4 => PHP
Approach 2: Using array_merge() Function
The array_merge() function merges two arrays being passed as arguments. The first argument of the array_push() function is the original array and subsequent argument is the key and the value to be added to the array in the form of an array as well.
Note: Keep in mind that this method will re-number numeric keys, if any (keys will start from 0, 1, 2...).
Example:
<?php
$myArray = [
"One" => "GeeksforGeeks",
"Two" => "GFG",
"Three" => "Learn, Practice, and Excel",
];
$myArray = array_merge($myArray, ["Four" => "PHP"]);
foreach ($myArray as $keyName => $valueName) {
echo $keyName . " => " . $valueName . "\n";
}
?>
Output
One => GeeksforGeeks Two => GFG Three => Learn, Practice, and Excel Four => PHP
Approach 3: Using += Operator
The += operator can be used to append a key-value pair to the end of the array.
Example:
<?php
$myArray = [
"1" => "GeeksforGeeks",
"2" => "GFG",
"3" => "Learn, Practice, and Excel",
];
$myArray += ["4" => "PHP"];
foreach ($myArray as $keyName => $valueName) {
echo $keyName . " => " . $valueName . "\n";
}
?>
Output
1 => GeeksforGeeks 2 => GFG 3 => Learn, Practice, and Excel 4 => PHP
Approach 4: Using the array_combine Function
The array_combine function in PHP creates an associative array by combining two arrays: one for keys and one for values. Each element in the first array is used as a key, and the corresponding element in the second array becomes the value.
Example:
<?php
// Define arrays for keys and values
$keys = ['name', 'age', 'city'];
$values = ['Alice', 25, 'New York'];
// Combine the two arrays into an associative array
$associativeArray = array_combine($keys, $values);
// Print the resulting array
print_r($associativeArray);
?>
Output
Array
(
[name] => Alice
[age] => 25
[city] => New York
)
Approach 5: Using array_replace()
In the array_replace() approach, you merge an existing array with a new array containing the key-value pair. This function replaces elements in the original array with elements from the new array. It adds the key-value pair if the key doesn't exist.
Example:
<?php
$array = [];
$key = 'fruit';
$value = 'apple';
$array = array_replace($array, [$key => $value]);
print_r($array); // Output: Array ( [fruit] => apple )
?>
Output
Array
(
[fruit] => apple
)
Approach 6: Using array_push() with Reference
This method involves using the array_push() function to add an associative array (containing the new key-value pair) to the original array. The array_push() function can add one or more elements to the end of an array.
Example: In this example, the pushKeyValuePair function takes the original array by reference, along with the key and value to be added. It creates an associative array containing the new key-value pair and then uses array_push() to add this associative array to the original array.
<?php
function pushKeyValuePair(&$array, $key, $value) {
// Create an associative array with the new key-value pair
$newElement = [$key => $value];
// Use array_push to add the associative array to the original array
array_push($array, $newElement);
}
// Example usage
$array = ['a' => 1, 'b' => 2, 'c' => 3];
$key = 'd';
$value = 4;
pushKeyValuePair($array, $key, $value);
print_r($array);
?>
Output
Array
(
[a] => 1
[b] => 2
[c] => 3
[0] => Array
(
[d] => 4
)
)
Approach 7: Using array_splice()
The array_splice() function can be used to insert a new key-value pair into an array at a specific position. By specifying the position as the end of the array, this function can effectively add the new pair to the array.
Example:
<?php
// Initialize the array
$array = ['a' => 1, 'b' => 2];
// Prepare the new key-value pair
$new_key_value = ['c' => 3];
// Convert the associative array to an indexed array for splicing
$keys = array_keys($array);
$values = array_values($array);
// Append the new key-value pair
array_splice($keys, count($keys), 0, array_keys($new_key_value));
array_splice($values, count($values), 0, array_values($new_key_value));
// Combine the keys and values back into an associative array
$array = array_combine($keys, $values);
print_r($array);
?>
Output
Array
(
[a] => 1
[b] => 2
[c] => 3
)
