Parameters.php
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Parameters.php
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	<?php

	declare(strict_types=1);

	namespace Ddeboer\Imap\Message;

	/**
	* @extends \ArrayIterator<int\|string, int\|string\|\stdClass[]>
	*/
	class Parameters extends \ArrayIterator
	{
	/**
	* @var array<string, string>
	*/
	private static array $attachmentCustomKeys = [
	'name*' => 'name',
	'filename*' => 'filename',
	];

	/**
	* @param \stdClass[] $parameters
	*/
	public function add(array $parameters = []): void
	{
	foreach ($parameters as $parameter) {
	$key = \strtolower($parameter->attribute);
	if (isset(self::$attachmentCustomKeys[$key])) {
	$key = self::$attachmentCustomKeys[$key];
	}
	$value = $this->decode($parameter->value);
	$this[$key] = $value;
	}
	}

	/**
	* @return null\|int\|\stdClass[]\|string
	*/
	public function get(string $key)
	{
	return $this[$key] ?? null;
	}

	final protected function decode(string $value): string
	{
	$parts = \imap_mime_header_decode($value);
	if (!\is_array($parts)) {
	return $value;
	}

	$decoded = '';
	foreach ($parts as $part) {
	$text = $part->text;
	if ('default' !== $part->charset) {
	$text = Transcoder::decode($text, $part->charset);
	}
	// RFC2231
	if (1 === \preg_match('/^(?<encoding>[^\']+)\'[^\']*?\'(?<urltext>.+)$/', $text, $matches)) {
	$hasInvalidChars = 1 === \preg_match('#[^%a-zA-Z0-9\-_\.\+]#', $matches['urltext']);
	$hasEscapedChars = 1 === \preg_match('#%[a-zA-Z0-9]{2}#', $matches['urltext']);
	if (!$hasInvalidChars && $hasEscapedChars) {
	$text = Transcoder::decode(\urldecode($matches['urltext']), $matches['encoding']);
	}
	}

	$decoded .= $text;
	}

	return $decoded;
	}
	}