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<?php |
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namespace Xparse\Parser\Helper; |
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/** |
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* Class EncodingConverter |
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* @package Xparse\Parser\Helper |
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*/ |
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class HtmlEncodingConverter { |
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/** |
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* @var array|null |
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*/ |
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private static $supportedEncodings = null; |
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/** |
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* Try to detect input encoding from contentType or from html <meta> tag |
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* |
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* @param string $html |
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* @param bool $contentType |
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* @return string |
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*/ |
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public static function convertToUtf($html, $contentType = false) { |
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$encoding = null; |
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if (!empty($contentType)) { |
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preg_match("!^.*charset=([A-Za-z0-9-]{4,})$!", $contentType, $contentTypeData); |
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$encoding = !empty($contentTypeData[1]) ? trim($contentTypeData[1]) : null; |
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} |
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if ($encoding === null) { |
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preg_match("!.*<meta.*charset=[\"']?[ \t]*([A-Za-z0-9-]{4,})[ \t]*[\"']!mi", $html, $metaContentType); |
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$encoding = !empty($metaContentType[1]) ? trim($metaContentType[1]) : null; |
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} |
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if ($encoding === null) { |
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return $html; |
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} |
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$encoding = strtolower($encoding); |
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if (in_array($encoding, self::getSupportedEncodings())) { |
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$html = mb_convert_encoding($html, 'utf-8', $encoding); |
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} |
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return $html; |
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} |
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/** |
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* @return array |
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*/ |
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private static function getSupportedEncodings() { |
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if (self::$supportedEncodings !== null) { |
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return self::$supportedEncodings; |
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} |
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$hasAliasesFunction = function_exists('mb_encoding_aliases'); |
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self::$supportedEncodings = []; |
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foreach (mb_list_encodings() as $encoding) { |
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$encoding = strtolower($encoding); |
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if ($encoding === 'utf-8' or $encoding === 'utf8') { |
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continue; |
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} |
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self::$supportedEncodings[] = $encoding; |
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if ($hasAliasesFunction) { |
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foreach (mb_encoding_aliases($encoding) as $encodingAlias) { |
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$encodingAlias = strtolower($encodingAlias); |
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self::$supportedEncodings[] = $encodingAlias; |
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} |
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} |
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} |
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return self::$supportedEncodings; |
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} |
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} |
xparse /
Parser
