/**
* Truncate a string that contains HTML tags. Will close all HTML tags as needed.
*
* Truncates a string to a max. length and optionally adds a filler string,
* e.g. '...', to indicate the truncation.
* This function is multi-byte string aware. This function is based on a
* code snippet by pitje at Snipplr.com.
*
* NOTE: The truncated string may be shorter or longer than $maxlen characters.
* Currently any initial html tags in the truncated string are taken into account.
* The $filler string is also taken into account but any html tags that are added
* by this function to close open html tags are not.
*
* @param string $htmltext the text string which contains HTML tags to truncate
* @param int $maxlen max. number of characters in the truncated string
* @param string $filler optional filler string, e.g. '...'
* @param int $endchars number of characters to show after the filler
* @return string truncated string
*
*/
function COM_truncateHTML($htmltext, $maxlen, $filler = '', $endchars = 0)
{
$newlen = $maxlen - MBYTE_strlen($filler);
$len = MBYTE_strlen($htmltext);
if ($len > $maxlen) {
$htmltext = MBYTE_substr($htmltext, 0, $newlen - $endchars);
// Strip any mangled tags off the end
if (MBYTE_strrpos($htmltext, '<') > MBYTE_strrpos($htmltext, '>')) {
$htmltext = MBYTE_substr($htmltext, 0, MBYTE_strrpos($htmltext, '<'));
}
$htmltext = $htmltext . $filler . MBYTE_substr($htmltext, $len - $endchars, $endchars);
// put all opened tags into an array
preg_match_all("#<([a-z]+)( .*)?(?!/)>#iU", $htmltext, $result);
$openedtags = $result[1];
$openedtags = array_diff($openedtags, array("img", "hr", "br"));
$openedtags = array_values($openedtags);
// put all closed tags into an array
preg_match_all("#</([a-z]+)>#iU", $htmltext, $result);
$closedtags = $result[1];
$len_opened = count($openedtags);
// all tags are closed
if (count($closedtags) == $len_opened) {
return $htmltext;
}
$openedtags = array_reverse($openedtags);
// close tags
for ($i = 0; $i < $len_opened; $i++) {
if (!in_array($openedtags[$i], $closedtags)) {
$htmltext .= "</" . $openedtags[$i] . ">";
} else {
unset($closedtags[array_search($openedtags[$i], $closedtags)]);
}
}
}
return $htmltext;
}
/**
* Truncate a feed item's text to a given max. length of characters
*
* @param string $text the item's text
* @param int $length max. length
* @return string truncated text
*
*/
function SYND_truncateSummary($text, $length)
{
if ($length == 0) {
return '';
} else {
$text = stripslashes($text);
$text = trim($text);
$text = str_replace(array("\r\n", "\r"), "\n", $text);
if ($length > 3 && MBYTE_strlen($text) > $length) {
$text = MBYTE_substr($text, 0, $length - 3) . '...';
}
// Check if we broke an html tag and storytext is now something
// like "blah blah <a href= ...". Delete "<*" if so.
if (MBYTE_strrpos($text, '<') > MBYTE_strrpos($text, '>')) {
$text = MBYTE_substr($text, 0, MBYTE_strrpos($text, '<')) . ' ...';
}
return $text;
}
}
