How to Convert a PHP Array into a Query String?

PHP Function to Construct a Query String from an Array

In PHP, there's an inherent function that effortlessly constructs a query string from an array of key-value pairs. This article aims to unveil the name of this elusive function.

Built-In PHP Function

Despite the abundance of third-party solutions available online, the PHP language offers its own dedicated function for this task. Its name is http_build_query().

Usage

The http_build_query() function accepts an array of key-value pairs as its input and returns a query string. The syntax is as follows:

<code class="php">http_build_query($data);</code>

where $data is the input array.

Example

Consider the following array:

<code class="php">$data = array(
    'name' => 'John Doe',
    'age' => 30,
    'city' => 'New York'
);</code>

Using http_build_query():

<code class="php">$queryString = http_build_query($data);</code>

The resulting query string will be:

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

Notes

• The key-value pairs are separated by ampersands (&).
• Spaces in the values are automatically URL-encoded.
• The function can also handle nested arrays, allowing for complex query strings to be built.

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