http_build_query() Function in PHP 8.2 With Example

Support PHP Version: PHP 7.1, PHP 7.2, PHP 7.3, PHP 7.4, PHP 8.0, PHP 8.1, PHP 8.2, PHP 8.3 With Latest All Version Support.

The `http_build_query()` function in PHP is used to generate a URL-encoded query string from an associative (or indexed) array. It’s commonly used when you need to construct a query string to be appended to a URL in HTTP requests. This function is particularly useful when dealing with forms and constructing URLs with dynamic parameters.

Here’s an example of how you can use `http_build_query()`:

<?php

// Sample associative array with query parameters
$data = array(
'name' => 'John Doe',
'age' => 30,
'city' => 'New York',
'country' => 'USA'
);

// Generate a URL-encoded query string
$queryString = http_build_query($data);

// Output the generated query string
echo $queryString;

?>

Output:

name=John+Doe&age=30&city=New+York&country=USA

In this example, the associative array `$data` contains key-value pairs representing various parameters. When `http_build_query()` is called with this array, it constructs a URL-encoded query string where each key-value pair is separated by an ampersand (`&`), and the key and value are separated by an equals sign (`=`). Additionally, spaces are replaced by plus signs (`+`) in the resulting string.