How To Add Key Value In Array Php

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In PHP, arrays are one of the most commonly used data structures that allow you to store multiple values in a single variable. You can create an array with numeric keys (indexed array) or with string keys (associative array).

In this blog post, we will discuss how to add a key-value pair to an array in PHP.

Adding Key-Value Pair to an Associative Array

To add a key-value pair to an associative array, you can simply use the assignment operator (=) and specify the key in square brackets []:

<?php
$associative_array = array(
    "first_name" => "John",
    "last_name" => "Doe"
);

$associative_array["age"] = 30;

print_r($associative_array);
?>

This will output the following array:

Array
(
    [first_name] => John
    [last_name] => Doe
    [age] => 30
)

Adding Key-Value Pair to an Indexed Array

To add a value to an indexed array, you can simply use the array_push() function which will append the value to the end of the array:

<?php
$indexed_array = array(10, 20, 30);

array_push($indexed_array, 40);

print_r($indexed_array);
?>

This will output the following array:

Array
(
    [0] => 10
    [1] => 20
    [2] => 30
    [3] => 40
)

Alternatively, you can use the empty square brackets [] without specifying the key to add a value to an indexed array:

<?php
$indexed_array = array(10, 20, 30);

$indexed_array[] = 40;

print_r($indexed_array);
?>

The result will be the same as with the array_push() function:

Array
(
    [0] => 10
    [1] => 20
    [2] => 30
    [3] => 40
)

Conclusion

In this blog post, we learned how to add a key-value pair in both associative and indexed arrays in PHP. With these techniques, you can easily manage and manipulate arrays in your PHP applications.