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<?php
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namespace GuzzleHttp\Psr7;
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final class Query
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{
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/**
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* Parse a query string into an associative array.
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*
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* If multiple values are found for the same key, the value of that key
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* value pair will become an array. This function does not parse nested
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* PHP style arrays into an associative array (e.g., `foo[a]=1&foo[b]=2`
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* will be parsed into `['foo[a]' => '1', 'foo[b]' => '2'])`.
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*
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* @param string $str Query string to parse
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* @param int|bool $urlEncoding How the query string is encoded
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*
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* @return array
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*/
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public static function parse($str, $urlEncoding = true)
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{
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$result = [];
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if ($str === '') {
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return $result;
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}
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if ($urlEncoding === true) {
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$decoder = function ($value) {
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return rawurldecode(str_replace('+', ' ', $value));
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};
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} elseif ($urlEncoding === PHP_QUERY_RFC3986) {
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$decoder = 'rawurldecode';
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} elseif ($urlEncoding === PHP_QUERY_RFC1738) {
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$decoder = 'urldecode';
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} else {
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$decoder = function ($str) { return $str; };
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}
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foreach (explode('&', $str) as $kvp) {
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$parts = explode('=', $kvp, 2);
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$key = $decoder($parts[0]);
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$value = isset($parts[1]) ? $decoder($parts[1]) : null;
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if (!isset($result[$key])) {
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$result[$key] = $value;
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} else {
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if (!is_array($result[$key])) {
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$result[$key] = [$result[$key]];
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}
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$result[$key][] = $value;
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}
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}
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return $result;
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}
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/**
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* Build a query string from an array of key value pairs.
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*
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* This function can use the return value of `parse()` to build a query
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* string. This function does not modify the provided keys when an array is
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* encountered (like `http_build_query()` would).
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*
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* @param array $params Query string parameters.
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* @param int|false $encoding Set to false to not encode, PHP_QUERY_RFC3986
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* to encode using RFC3986, or PHP_QUERY_RFC1738
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* to encode using RFC1738.
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* @return string
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*/
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public static function build(array $params, $encoding = PHP_QUERY_RFC3986)
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{
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if (!$params) {
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return '';
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}
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if ($encoding === false) {
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$encoder = function ($str) { return $str; };
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} elseif ($encoding === PHP_QUERY_RFC3986) {
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$encoder = 'rawurlencode';
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} elseif ($encoding === PHP_QUERY_RFC1738) {
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$encoder = 'urlencode';
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} else {
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throw new \InvalidArgumentException('Invalid type');
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}
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$qs = '';
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foreach ($params as $k => $v) {
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$k = $encoder($k);
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if (!is_array($v)) {
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$qs .= $k;
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if ($v !== null) {
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$qs .= '=' . $encoder($v);
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}
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$qs .= '&';
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} else {
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foreach ($v as $vv) {
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$qs .= $k;
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if ($vv !== null) {
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$qs .= '=' . $encoder($vv);
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}
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$qs .= '&';
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}
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}
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}
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return $qs ? (string) substr($qs, 0, -1) : '';
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}
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}
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