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Editing: Header.php

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<?php

namespace GuzzleHttp\Psr7;

final class Header
{
    /**
     * Parse an array of header values containing ";" separated data into an
     * array of associative arrays representing the header key value pair data
     * of the header. When a parameter does not contain a value, but just
     * contains a key, this function will inject a key with a '' string value.
     *
     * @param string|array $header Header to parse into components.
     *
     * @return array Returns the parsed header values.
     */
    public static function parse($header)
    {
        static $trimmed = "\"'  \n\t\r";
        $params = $matches = [];

foreach (self::normalize($header) as $val) {
            $part = [];
            foreach (preg_split('/;(?=([^"]*"[^"]*")*[^"]*$)/', $val) as $kvp) {
                if (preg_match_all('/<[^>]+>|[^=]+/', $kvp, $matches)) {
                    $m = $matches[0];
                    if (isset($m[1])) {
                        $part[trim($m[0], $trimmed)] = trim($m[1], $trimmed);
                    } else {
                        $part[] = trim($m[0], $trimmed);
                    }
                }
            }
            if ($part) {
                $params[] = $part;
            }
        }

return $params;
    }

/**
     * Converts an array of header values that may contain comma separated
     * headers into an array of headers with no comma separated values.
     *
     * @param string|array $header Header to normalize.
     *
     * @return array Returns the normalized header field values.
     */
    public static function normalize($header)
    {
        if (!is_array($header)) {
            return array_map('trim', explode(',', $header));
        }

$result = [];
        foreach ($header as $value) {
            foreach ((array) $value as $v) {
                if (strpos($v, ',') === false) {
                    $result[] = $v;
                    continue;
                }
                foreach (preg_split('/,(?=([^"]*"[^"]*")*[^"]*$)/', $v) as $vv) {
                    $result[] = trim($vv);
                }
            }
        }

return $result;
    }
}

Editing: Header.php

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