Just wondering if Yii has any built in methods for working with substrings and maintaining the HTML, as in, say you chop a text field so yoyu only use the first 500 chars in a previews but the vut of point is mid way between an open <ul> pair of tags (For example)
If not, what ideas would people suggest for this kind of problem?
It’s not so easy to implement.
I use a function - found when searching for this topic: Cut Html
/**
* Truncates a string to the length of $length and replaces the last characters
* with the ending if the text is longer than length.
*
* @param $text String Text to truncate.
* @param $length Integer Length of returned string, including ellipsis.
* @param $ending String Ending to be appended to the trimmed string.
* @param $exact Boolean If true, $text might get cut mid-word
* @param $considerHtml Boolean If true, HTML tags would be handled correctly
*
* @return String Trimmed string.
*
* @see
* http://www.gsdesign.ro/blog/cut-html-string-without-breaking-the-tags/
*
*/
public static function truncate($text, $length = 100, $removetags = array(), $ending = '...', $exact = false, $considerHtml = true) {
if (!empty($removetags)) $text = preg_replace('#<(' . implode('|', $removetags) . ')>.*?</\1>#s', '', $text);
if ($considerHtml) {
if (strlen(preg_replace('/<.*?>/', '', $text)) <= $length) {
return $text;
}
preg_match_all('/(<.+?>)?([^<>]*)/s', $text, $lines, PREG_SET_ORDER);
$total_length = strlen($ending);
$open_tags = array();
$truncate = '';
foreach ($lines as $line_matchings) {
if (!empty($line_matchings[1])) {
if (preg_match('/^<(\s*.+?\/\s*|\s*(img|br|input|hr|area|base|basefont|col|frame|isindex|link|meta|param)(\s.+?)?)>$/is', $line_matchings[1])) {
// do nothing
} else if (preg_match('/^<\s*\/([^\s]+?)\s*>$/s', $line_matchings[1], $tag_matchings)) {
$pos = array_search($tag_matchings[1], $open_tags);
if ($pos !== false) {
unset($open_tags[$pos]);
}
} else if (preg_match('/^<\s*([^\s>!]+).*?>$/s', $line_matchings[1], $tag_matchings)) {
array_unshift($open_tags, strtolower($tag_matchings[1]));
}
$truncate .= $line_matchings[1];
}
$content_length = strlen(preg_replace('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|&#x[0-9a-f]{1,6};/i', ' ', $line_matchings[2]));
if ($total_length + $content_length > $length) {
$left = $length - $total_length;
$entities_length = 0;
if (preg_match_all('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|&#x[0-9a-f]{1,6};/i', $line_matchings[2], $entities, PREG_OFFSET_CAPTURE)) {
foreach ($entities[0] as $entity) {
if ($entity[1]+1-$entities_length <= $left) {
$left--;
$entities_length += strlen($entity[0]);
} else {
break;
}
}
}
$truncate .= substr($line_matchings[2], 0, $left + $entities_length);
break;
} else {
$truncate .= $line_matchings[2];
$total_length += $content_length;
}
if ($total_length>= $length) break;
}
} else {
if (strlen($text) <= $length) {
return $text;
} else {
$truncate = substr($text, 0, $length - strlen($ending));
}
}
if (!$exact) {
$spacepos = strrpos($truncate, ' ');
if (isset($spacepos)) {
$truncate = substr($truncate, 0, $spacepos);
}
}
$truncate .= $ending;
if($considerHtml) {
foreach ($open_tags as $tag) {
$truncate .= '</' . $tag . '>';
}
}
return $truncate;
}