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-rwxr-xr-xapplication/LinkUtils.php79
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1<?php
2
3/**
4 * Extract title from an HTML document.
5 *
6 * @param string $html HTML content where to look for a title.
7 *
8 * @return bool|string Extracted title if found, false otherwise.
9 */
10function html_extract_title($html)
11{
12 if (preg_match('!<title>(.*)</title>!is', $html, $matches)) {
13 return trim(str_replace("\n", ' ', $matches[1]));
14 }
15 return false;
16}
17
18/**
19 * Determine charset from downloaded page.
20 * Priority:
21 * 1. HTTP headers (Content type).
22 * 2. HTML content page (tag <meta charset>).
23 * 3. Use a default charset (default: UTF-8).
24 *
25 * @param array $headers HTTP headers array.
26 * @param string $htmlContent HTML content where to look for charset.
27 * @param string $defaultCharset Default charset to apply if other methods failed.
28 *
29 * @return string Determined charset.
30 */
31function get_charset($headers, $htmlContent, $defaultCharset = 'utf-8')
32{
33 if ($charset = headers_extract_charset($headers)) {
34 return $charset;
35 }
36
37 if ($charset = html_extract_charset($htmlContent)) {
38 return $charset;
39 }
40
41 return $defaultCharset;
42}
43
44/**
45 * Extract charset from HTTP headers if it's defined.
46 *
47 * @param array $headers HTTP headers array.
48 *
49 * @return bool|string Charset string if found (lowercase), false otherwise.
50 */
51function headers_extract_charset($headers)
52{
53 if (! empty($headers['Content-Type']) && strpos($headers['Content-Type'], 'charset=') !== false) {
54 preg_match('/charset="?([^; ]+)/i', $headers['Content-Type'], $match);
55 if (! empty($match[1])) {
56 return strtolower(trim($match[1]));
57 }
58 }
59
60 return false;
61}
62
63/**
64 * Extract charset HTML content (tag <meta charset>).
65 *
66 * @param string $html HTML content where to look for charset.
67 *
68 * @return bool|string Charset string if found, false otherwise.
69 */
70function html_extract_charset($html)
71{
72 // Get encoding specified in HTML header.
73 preg_match('#<meta .*charset="?([^">/]+)"? */?>#Usi', $html, $enc);
74 if (!empty($enc[1])) {
75 return strtolower($enc[1]);
76 }
77
78 return false;
79}