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<?php
namespace GuzzleHttp;
/**
* Manages query string variables and can aggregate them into a string
*/
class Query extends Collection
{
const RFC3986 = 'RFC3986';
const RFC1738 = 'RFC1738';
/** @var callable Encoding function */
private $encoding = 'rawurlencode';
/** @var callable */
private $aggregator;
/**
* Parse a query string into a Query object
*
* $urlEncoding is used to control how the query string is parsed and how
* it is ultimately serialized. The value can be set to one of the
* following:
*
* - true: (default) Parse query strings using RFC 3986 while still
* converting "+" to " ".
* - false: Disables URL decoding of the input string and URL encoding when
* the query string is serialized.
* - 'RFC3986': Use RFC 3986 URL encoding/decoding
* - 'RFC1738': Use RFC 1738 URL encoding/decoding
*
* @param string $query Query string to parse
* @param bool|string $urlEncoding Controls how the input string is decoded
* and encoded.
* @return self
*/
public static function fromString($query, $urlEncoding = true)
{
static $qp;
if (!$qp) {
$qp = new QueryParser();
}
$q = new static();
if ($urlEncoding !== true) {
$q->setEncodingType($urlEncoding);
}
$qp->parseInto($q, $query, $urlEncoding);
return $q;
}
/**
* Convert the query string parameters to a query string string
*
* @return string
*/
public function __toString()
{
if (!$this->data) {
return '';
}
// The default aggregator is statically cached
static $defaultAggregator;
if (!$this->aggregator) {
if (!$defaultAggregator) {
$defaultAggregator = self::phpAggregator();
}
$this->aggregator = $defaultAggregator;
}
$result = '';
$aggregator = $this->aggregator;
$encoder = $this->encoding;
foreach ($aggregator($this->data) as $key => $values) {
foreach ($values as $value) {
if ($result) {
$result .= '&';
}
$result .= $encoder($key);
if ($value !== null) {
$result .= '=' . $encoder($value);
}
}
}
return $result;
}
/**
* Controls how multi-valued query string parameters are aggregated into a
* string.
*
* $query->setAggregator($query::duplicateAggregator());
*
* @param callable $aggregator Callable used to convert a deeply nested
* array of query string variables into a flattened array of key value
* pairs. The callable accepts an array of query data and returns a
* flattened array of key value pairs where each value is an array of
* strings.
*/
public function setAggregator(callable $aggregator)
{
$this->aggregator = $aggregator;
}
/**
* Specify how values are URL encoded
*
* @param string|bool $type One of 'RFC1738', 'RFC3986', or false to disable encoding
*
* @throws \InvalidArgumentException
*/
public function setEncodingType($type)
{
switch ($type) {
case self::RFC3986:
$this->encoding = 'rawurlencode';
break;
case self::RFC1738:
$this->encoding = 'urlencode';
break;
case false:
$this->encoding = function ($v) { return $v; };
break;
default:
throw new \InvalidArgumentException('Invalid URL encoding type');
}
}
/**
* Query string aggregator that does not aggregate nested query string
* values and allows duplicates in the resulting array.
*
* Example: http://test.com?q=1&q=2
*
* @return callable
*/
public static function duplicateAggregator()
{
return function (array $data) {
return self::walkQuery($data, '', function ($key, $prefix) {
return is_int($key) ? $prefix : "{$prefix}[{$key}]";
});
};
}
/**
* Aggregates nested query string variables using the same technique as
* ``http_build_query()``.
*
* @param bool $numericIndices Pass false to not include numeric indices
* when multi-values query string parameters are present.
*
* @return callable
*/
public static function phpAggregator($numericIndices = true)
{
return function (array $data) use ($numericIndices) {
return self::walkQuery(
$data,
'',
function ($key, $prefix) use ($numericIndices) {
return !$numericIndices && is_int($key)
? "{$prefix}[]"
: "{$prefix}[{$key}]";
}
);
};
}
/**
* Easily create query aggregation functions by providing a key prefix
* function to this query string array walker.
*
* @param array $query Query string to walk
* @param string $keyPrefix Key prefix (start with '')
* @param callable $prefixer Function used to create a key prefix
*
* @return array
*/
public static function walkQuery(array $query, $keyPrefix, callable $prefixer)
{
$result = [];
foreach ($query as $key => $value) {
if ($keyPrefix) {
$key = $prefixer($key, $keyPrefix);
}
if (is_array($value)) {
$result += self::walkQuery($value, $key, $prefixer);
} elseif (isset($result[$key])) {
$result[$key][] = $value;
} else {
$result[$key] = array($value);
}
}
return $result;
}
}