1557cefbd7
* `get_http_url()` renamed to `get_http_response()`. * Use the same HTTP context to retrieve response headers and content. * Follow HTTP 301 and 302 redirections to retrieve the title (default max 3 redirections). * Add `LinkUtils` to extract titles and charset. * Try to retrieve charset from HTTP headers first (new), then HTML content. * Use mb_string to re-encode title if necessary.
80 lines
2 KiB
PHP
Executable file
80 lines
2 KiB
PHP
Executable file
<?php
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/**
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* Extract title from an HTML document.
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*
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* @param string $html HTML content where to look for a title.
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*
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* @return bool|string Extracted title if found, false otherwise.
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*/
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function html_extract_title($html)
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{
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if (preg_match('!<title>(.*)</title>!is', $html, $matches)) {
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return trim(str_replace("\n", ' ', $matches[1]));
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}
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return false;
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}
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/**
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* Determine charset from downloaded page.
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* Priority:
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* 1. HTTP headers (Content type).
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* 2. HTML content page (tag <meta charset>).
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* 3. Use a default charset (default: UTF-8).
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*
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* @param array $headers HTTP headers array.
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* @param string $htmlContent HTML content where to look for charset.
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* @param string $defaultCharset Default charset to apply if other methods failed.
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*
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* @return string Determined charset.
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*/
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function get_charset($headers, $htmlContent, $defaultCharset = 'utf-8')
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{
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if ($charset = headers_extract_charset($headers)) {
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return $charset;
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}
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if ($charset = html_extract_charset($htmlContent)) {
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return $charset;
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}
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return $defaultCharset;
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}
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/**
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* Extract charset from HTTP headers if it's defined.
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*
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* @param array $headers HTTP headers array.
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*
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* @return bool|string Charset string if found (lowercase), false otherwise.
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*/
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function headers_extract_charset($headers)
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{
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if (! empty($headers['Content-Type']) && strpos($headers['Content-Type'], 'charset=') !== false) {
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preg_match('/charset="?([^; ]+)/i', $headers['Content-Type'], $match);
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if (! empty($match[1])) {
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return strtolower(trim($match[1]));
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}
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}
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return false;
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}
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/**
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* Extract charset HTML content (tag <meta charset>).
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*
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* @param string $html HTML content where to look for charset.
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*
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* @return bool|string Charset string if found, false otherwise.
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*/
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function html_extract_charset($html)
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{
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// Get encoding specified in HTML header.
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preg_match('#<meta .*charset="?([^">/]+)"? */?>#Usi', $html, $enc);
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if (!empty($enc[1])) {
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return strtolower($enc[1]);
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}
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return false;
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}
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