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- <?php
- /**
- * Extract title from an HTML document.
- *
- * @param string $html HTML content where to look for a title.
- *
- * @return bool|string Extracted title if found, false otherwise.
- */
- function html_extract_title($html)
- {
- if (preg_match('!<title>(.*)</title>!is', $html, $matches)) {
- return trim(str_replace("\n", ' ', $matches[1]));
- }
- return false;
- }
- /**
- * Determine charset from downloaded page.
- * Priority:
- * 1. HTTP headers (Content type).
- * 2. HTML content page (tag <meta charset>).
- * 3. Use a default charset (default: UTF-8).
- *
- * @param array $headers HTTP headers array.
- * @param string $htmlContent HTML content where to look for charset.
- * @param string $defaultCharset Default charset to apply if other methods failed.
- *
- * @return string Determined charset.
- */
- function get_charset($headers, $htmlContent, $defaultCharset = 'utf-8')
- {
- if ($charset = headers_extract_charset($headers)) {
- return $charset;
- }
- if ($charset = html_extract_charset($htmlContent)) {
- return $charset;
- }
- return $defaultCharset;
- }
- /**
- * Extract charset from HTTP headers if it's defined.
- *
- * @param array $headers HTTP headers array.
- *
- * @return bool|string Charset string if found (lowercase), false otherwise.
- */
- function headers_extract_charset($headers)
- {
- if (! empty($headers['Content-Type']) && strpos($headers['Content-Type'], 'charset=') !== false) {
- preg_match('/charset="?([^; ]+)/i', $headers['Content-Type'], $match);
- if (! empty($match[1])) {
- return strtolower(trim($match[1]));
- }
- }
- return false;
- }
- /**
- * Extract charset HTML content (tag <meta charset>).
- *
- * @param string $html HTML content where to look for charset.
- *
- * @return bool|string Charset string if found, false otherwise.
- */
- function html_extract_charset($html)
- {
- // Get encoding specified in HTML header.
- preg_match('#<meta .*charset="?([^">/]+)"? */?>#Usi', $html, $enc);
- if (!empty($enc[1])) {
- return strtolower($enc[1]);
- }
- return false;
- }
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