<?php

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namespace GuzzleHttp\Psr7;

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final class Header

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{

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/**

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* Parse an array of header values containing ";" separated data into an

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* array of associative arrays representing the header key value pair data

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* of the header. When a parameter does not contain a value, but just

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* contains a key, this function will inject a key with a '' string value.

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*

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* @param string|array $header Header to parse into components.

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*

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* @return array Returns the parsed header values.

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*/

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public static function parse($header)

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{

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static $trimmed = "\"' \n\t\r";

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$params = $matches = [];

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foreach (self::normalize($header) as $val) {

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$part = [];

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foreach (preg_split('/;(?=([^"]*"[^"]*")*[^"]*$)/', $val) as $kvp) {

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if (preg_match_all('/<[^>]+>|[^=]+/', $kvp, $matches)) {

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$m = $matches[0];

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if (isset($m[1])) {

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$part[trim($m[0], $trimmed)] = trim($m[1], $trimmed);

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} else {

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$part[] = trim($m[0], $trimmed);

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}

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}

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}

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if ($part) {

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$params[] = $part;

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}

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}

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return $params;

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}

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/**

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* Converts an array of header values that may contain comma separated

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* headers into an array of headers with no comma separated values.

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*

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* @param string|array $header Header to normalize.

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*

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* @return array Returns the normalized header field values.

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*/

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public static function normalize($header)

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{

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if (!is_array($header)) {

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return array_map('trim', explode(',', $header));

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}

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$result = [];

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foreach ($header as $value) {

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foreach ((array) $value as $v) {

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if (strpos($v, ',') === false) {

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$result[] = $v;

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continue;

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}

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foreach (preg_split('/,(?=([^"]*"[^"]*")*[^"]*$)/', $v) as $vv) {

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$result[] = trim($vv);

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}

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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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