(.*?)!is', $html, $matches)) { return trim(str_replace("\n", '', $matches[1])); } return false; } /** * Extract charset from HTTP header if it's defined. * * @param string $header HTTP header Content-Type line. * * @return bool|string Charset string if found (lowercase), false otherwise. */ function header_extract_charset($header) { preg_match('/charset="?([^; ]+)/i', $header, $match); if (! empty($match[1])) { return strtolower(trim($match[1])); } return false; } /** * Extract charset HTML content (tag ). * * @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('#/]+)["\']? */?>#Usi', $html, $enc); if (!empty($enc[1])) { return strtolower($enc[1]); } return false; } /** * Count private links in given linklist. * * @param array|Countable $links Linklist. * * @return int Number of private links. */ function count_private($links) { $cpt = 0; foreach ($links as $link) { if ($link['private']) { $cpt += 1; } } return $cpt; } /** * In a string, converts URLs to clickable links. * * @param string $text input string. * @param string $redirector if a redirector is set, use it to gerenate links. * @param bool $urlEncode Use `urlencode()` on the URL after the redirector or not. * * @return string returns $text with all links converted to HTML links. * * @see Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722 */ function text2clickable($text, $redirector = '', $urlEncode = true) { $regex = '!(((?:https?|ftp|file)://|apt:|magnet:)\S+[a-z0-9\(\)]/?)!si'; if (empty($redirector)) { return preg_replace($regex, '$1', $text); } // Redirector is set, urlencode the final URL. return preg_replace_callback( $regex, function ($matches) use ($redirector, $urlEncode) { $url = $urlEncode ? urlencode($matches[1]) : $matches[1]; return ''. $matches[1] .''; }, $text ); } /** * Auto-link hashtags. * * @param string $description Given description. * @param string $indexUrl Root URL. * * @return string Description with auto-linked hashtags. */ function hashtag_autolink($description, $indexUrl = '') { /* * To support unicode: http://stackoverflow.com/a/35498078/1484919 * \p{Pc} - to match underscore * \p{N} - numeric character in any script * \p{L} - letter from any language * \p{Mn} - any non marking space (accents, umlauts, etc) */ $regex = '/(^|\s)#([\p{Pc}\p{N}\p{L}\p{Mn}]+)/mui'; $replacement = '$1#$2'; return preg_replace($regex, $replacement, $description); } /** * This function inserts   where relevant so that multiple spaces are properly displayed in HTML * even in the absence of
  (This is used in description to keep text formatting).
 *
 * @param string $text input text.
 *
 * @return string formatted text.
 */
function space2nbsp($text)
{
    return preg_replace('/(^| ) /m', '$1 ', $text);
}

/**
 * Format Shaarli's description
 *
 * @param string $description shaare's description.
 * @param string $redirector  if a redirector is set, use it to gerenate links.
 * @param bool   $urlEncode   Use `urlencode()` on the URL after the redirector or not.
 * @param string $indexUrl    URL to Shaarli's index.

 * @return string formatted description.
 */
function format_description($description, $redirector = '', $urlEncode = true, $indexUrl = '')
{
    return nl2br(space2nbsp(hashtag_autolink(text2clickable($description, $redirector, $urlEncode), $indexUrl)));
}

/**
 * Generate a small hash for a link.
 *
 * @param DateTime $date Link creation date.
 * @param int      $id   Link ID.
 *
 * @return string the small hash generated from link data.
 */
function link_small_hash($date, $id)
{
    return smallHash($date->format(LinkDB::LINK_DATE_FORMAT) . $id);
}

/**
 * Returns whether or not the link is an internal note.
 * Its URL starts by `?` because it's actually a permalink.
 *
 * @param string $linkUrl
 *
 * @return bool true if internal note, false otherwise.
 */
function is_note($linkUrl)
{
    return isset($linkUrl[0]) && $linkUrl[0] === '?';
}