/**
* Limits HTML with specific length with a proper tag handling.
* @param string $html HTML string to limit
* @param int $maxLength String length to truncate at
* @param string $end
* @return string
*/
public static function limit($html, $maxLength = 100, $end = '...')
{
$printedLength = 0;
$position = 0;
$tags = [];
$re = '{</?([a-z]+)[^>]*>|&#?[a-zA-Z0-9]+;|[\\x80-\\xFF][\\x80-\\xBF]*}';
$result = '';
while ($printedLength < $maxLength && preg_match($re, $html, $match, PREG_OFFSET_CAPTURE, $position)) {
list($tag, $tagPosition) = $match[0];
$str = mb_substr($html, $position, $tagPosition - $position);
if ($printedLength + StrHelper::length($str) > $maxLength) {
$result .= mb_substr($str, 0, $maxLength - $printedLength) . $end;
$printedLength = $maxLength;
break;
}
$result .= $str;
$printedLength += StrHelper::length($str);
if ($printedLength >= $maxLength) {
$result .= $end;
break;
}
if ($tag[0] == '&' || ord($tag) >= 0x80) {
$result .= $tag;
$printedLength++;
} else {
$tagName = $match[1][0];
if ($tag[1] == '/') {
$openingTag = array_pop($tags);
$result .= $tag;
} else {
if ($tag[StrHelper::length($tag) - 2] == '/') {
$result .= $tag;
} else {
$result .= $tag;
$tags[] = $tagName;
}
}
}
$position = $tagPosition + StrHelper::length($tag);
}
if ($printedLength < $maxLength && $position < StrHelper::length($html)) {
$result .= substr($html, $position, $maxLength - $printedLength);
}
while (!empty($tags)) {
$result .= sprintf('</%s>', array_pop($tags));
}
return $result;
}
/**
* Return the length of the given string.
*
* @param string $value
* @return int
* @static
*/
public static function length($value)
{
//Method inherited from \Illuminate\Support\Str
return \October\Rain\Support\Str::length($value);
}
