Hi,
I'm always wondering if there is a truncate function for a Text (a
post f.e.) which considers opened HTML tags. Everytime i'd truncated a
text with the normal truncate function available in TextHelper, some
html tags werent closed and so my whole page looks damaged.
So i programmed a function which closes HTML functions.
I like you to review this function and to tell me your ideas.
Up to now, the function only acepts std xhtml:
function truncate($text, $length, $ending = '...', $exact = false) {
if(strlen(preg_replace('/<.*?>/', '', $text)) <= $length) {
return $text;
}
preg_match_all('/(<.+?>)?([^<>]*)/is', $text, $ausgabe,
PREG_SET_ORDER);
$total_length = 0;
$arr_elements = array();
$truncate = '';
foreach($ausgabe as $treffer) {
if(!empty($treffer[1])) {
//<img />
if(preg_match('/^<\s*.+?\/\s*>$/s', $treffer[1])) {
//echo
'1:'.htmlspecialchars($treffer[1]).'<br>';
//</b>
} else if(preg_match('/^<\s*\/([^\s]+?)\s*>$/s',
$treffer[1], $treffer2)) {
//echo '2:'.htmlspecialchars($treffer2[1]).'<br>';
$pos = array_search($treffer2[1], $arr_elements);
if($pos !== false) {
unset($arr_elements[$pos]);
}
//<b>
} else if(preg_match('/^<\s*([^\s>!]+).*?>$/s',
$treffer[1], $treffer2)) {
array_unshift($arr_elements,
strtolower($treffer2[1]));
//echo '3:'.htmlspecialchars($treffer2[1]).'<br>';
}
$truncate .= $treffer[1];
}
$content_length =
strlen(preg_replace('/(&[a-z]{1,6};|&#[0-9]+;)/
i', ' ', $treffer[2]));
if($total_length >= $length) {
break;
} else if($total_length+$content_length > $length) {
$left =
$total_length>$length?$total_length-$length:$length-
$total_length;
$entities_length = 0;
if(preg_match_all('/&[a-z]{1,6};|&#[0-9]+;/i',
$treffer[2],
$treffer3, PREG_OFFSET_CAPTURE)) {
foreach($treffer3[0] as $entity) {
if($entity[1]+1-$entities_length <= $left) {
$left--;
$entities_length += strlen($entity[0]);
} else break;
}
}
$truncate .= substr($treffer[2], 0,
$left+$entities_length);
break;
} else {
$truncate .= $treffer[2];
$total_length += $content_length;
}
}
//var_dump($ausgabe);
if(!$exact) {
$spacepos = strrpos($truncate, ' ');
if(isset($spacepos)) {
$truncate = substr($truncate, 0, $spacepos);
}
}
$truncate .= $ending;
foreach($arr_elements as $element) {
$truncate .= '</' . $element . '>';
}
return $truncate;
}
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