<?php
/**
- * Extract title from an HTML document.
+ * Get cURL callback function for CURLOPT_WRITEFUNCTION
*
- * @param string $html HTML content where to look for a title.
+ * @param string $charset to extract from the downloaded page (reference)
+ * @param string $title to extract from the downloaded page (reference)
+ * @param string $curlGetInfo Optionnaly overrides curl_getinfo function
*
- * @return bool|string Extracted title if found, false otherwise.
+ * @return Closure
*/
-function html_extract_title($html)
+function get_curl_download_callback(&$charset, &$title, $curlGetInfo = 'curl_getinfo')
{
- if (preg_match('!<title.*?>(.*?)</title>!is', $html, $matches)) {
- return trim(str_replace("\n", '', $matches[1]));
- }
- return false;
+ /**
+ * cURL callback function for CURLOPT_WRITEFUNCTION (called during the download).
+ *
+ * While downloading the remote page, we check that the HTTP code is 200 and content type is 'html/text'
+ * Then we extract the title and the charset and stop the download when it's done.
+ *
+ * @param resource $ch cURL resource
+ * @param string $data chunk of data being downloaded
+ *
+ * @return int|bool length of $data or false if we need to stop the download
+ */
+ return function(&$ch, $data) use ($curlGetInfo, &$charset, &$title) {
+ $responseCode = $curlGetInfo($ch, CURLINFO_RESPONSE_CODE);
+ if (!empty($responseCode) && $responseCode != 200) {
+ return false;
+ }
+ $contentType = $curlGetInfo($ch, CURLINFO_CONTENT_TYPE);
+ if (!empty($contentType) && strpos($contentType, 'text/html') === false) {
+ return false;
+ }
+ if (empty($charset)) {
+ $charset = header_extract_charset($contentType);
+ }
+ if (empty($charset)) {
+ $charset = html_extract_charset($data);
+ }
+ if (empty($title)) {
+ $title = html_extract_title($data);
+ }
+ // We got everything we want, stop the download.
+ if (!empty($responseCode) && !empty($contentType) && !empty($charset) && !empty($title)) {
+ return false;
+ }
+
+ return strlen($data);
+ };
}
/**
- * 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).
+ * Extract title from an HTML document.
*
- * @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.
+ * @param string $html HTML content where to look for a title.
*
- * @return string Determined charset.
+ * @return bool|string Extracted title if found, false otherwise.
*/
-function get_charset($headers, $htmlContent, $defaultCharset = 'utf-8')
+function html_extract_title($html)
{
- if ($charset = headers_extract_charset($headers)) {
- return $charset;
- }
-
- if ($charset = html_extract_charset($htmlContent)) {
- return $charset;
+ if (preg_match('!<title.*?>(.*?)</title>!is', $html, $matches)) {
+ return trim(str_replace("\n", '', $matches[1]));
}
-
- return $defaultCharset;
+ return false;
}
/**
- * Extract charset from HTTP headers if it's defined.
+ * Extract charset from HTTP header if it's defined.
*
- * @param array $headers HTTP headers array.
+ * @param string $header HTTP header Content-Type line.
*
* @return bool|string Charset string if found (lowercase), false otherwise.
*/
-function headers_extract_charset($headers)
+function header_extract_charset($header)
{
- if (! empty($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]));
- }
+ preg_match('/charset="?([^; ]+)/i', $header, $match);
+ if (! empty($match[1])) {
+ return strtolower(trim($match[1]));
}
return false;