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3 liveuser 1 
<?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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}