http_build_query polyfill

http_build_query.php

<?php 

if (!defined('PHP_QUERY_RFC1738')) {
	define('PHP_QUERY_RFC1738', 1);
}

if (!defined('PHP_QUERY_RFC3986')) {
	define('PHP_QUERY_RFC3986', 2);
}

if (!function_exists('http_build_query')) {
	function http_build_query($query_data, $numeric_prefix = null, $arg_separator = '&', $enc_type = PHP_QUERY_RFC1738, $recursive_prefix = null) {
		$query = '';

		// Check for arg_separator.output INI setting
		$arg_separator_ini = ini_get('arg_separator.output');
		if ('&' == $arg_separator && $arg_separator_ini) {
			$arg_separator = $arg_separator_ini;
		}

		// Loop thru query data
		foreach ($query_data as $key => $value) {
			// Handle numeric_prefix
			if (!$recursive_prefix && $numeric_prefix && is_int($key)) {
				$key = $numeric_prefix . $key;
			}

			// Handle recursive sub-arrays
			if ($recursive_prefix) {
				$key = $recursive_prefix . http_build_query_polyfill_encode('[' . $key . ']', $enc_type);
			}

			if (is_array($value)) {
				// Run recursively if necessary
				$query .= http_build_query($value, $numeric_prefix, $arg_separator, $enc_type, $key);
			} else {
				// Otherwise just encode
				$query .= $key . '=' . http_build_query_polyfill_encode($value, $enc_type) . $arg_separator;
			}
		}

		$query = rtrim($query, $arg_separator);
		return $query;
	}

	function http_build_query_polyfill_encode($value, $enc_type) {
		if (PHP_QUERY_RFC3986 == $enc_type) {
			return rawurlencode($value);
		}

		return urlencode($value);
	}
}