У меня есть строка вроде этого:
I love @kevinrose 's new website <a href="http://kevinrose.com">Link</a> И у меня есть эта функция:
function short($string, $max = 255) { if (strlen($string) >= $max) { $string = mb_substr($string, 0, $max - 5, 'utf-8') . '...'; } return $string; }
Если я разрежу экран в 50, это будет тем, что:
I love @kevinrose 's new website <a href="http://kevinr...
Который, конечно, убьет html.
Есть ли простой способ избежать резки тега href (раньше или предпочтительно после), не нарушая HTML?
Конечно, мне нужно держать свои теги.
спасибо
см. это из PHP: Truncate string при сохранении HTML-тегов и целых слов – Alan Whipple -> http://alanwhipple.com/2011/05/25/php-truncate-string-preserving-html-tags-words/
<?php /** * truncateHtml can truncate a string up to a number of characters while preserving whole words and HTML tags * * @param string $text String to truncate. * @param integer $length Length of returned string, including ellipsis. * @param string $ending Ending to be appended to the trimmed string. * @param boolean $exact If false, $text will not be cut mid-word * @param boolean $considerHtml If true, HTML tags would be handled correctly * * @return string Trimmed string. */ function truncateHtml($text, $length = 100, $ending = '...', $exact = false, $considerHtml = true) { if ($considerHtml) { // if the plain text is shorter than the maximum length, return the whole text if (strlen(preg_replace('/<.*?>/', '', $text)) <= $length) { return $text; } // splits all html-tags to scanable lines preg_match_all('/(<.+?>)?([^<>]*)/s', $text, $lines, PREG_SET_ORDER); $total_length = strlen($ending); $open_tags = array(); $truncate = ''; foreach ($lines as $line_matchings) { // if there is any html-tag in this line, handle it and add it (uncounted) to the output if (!empty($line_matchings[1])) { // if it's an "empty element" with or without xhtml-conform closing slash if (preg_match('/^<(\s*.+?\/\s*|\s*(img|br|input|hr|area|base|basefont|col|frame|isindex|link|meta|param)(\s.+?)?)>$/is', $line_matchings[1])) { // do nothing // if tag is a closing tag } else if (preg_match('/^<\s*\/([^\s]+?)\s*>$/s', $line_matchings[1], $tag_matchings)) { // delete tag from $open_tags list $pos = array_search($tag_matchings[1], $open_tags); if ($pos !== false) { unset($open_tags[$pos]); } // if tag is an opening tag } else if (preg_match('/^<\s*([^\s>!]+).*?>$/s', $line_matchings[1], $tag_matchings)) { // add tag to the beginning of $open_tags list array_unshift($open_tags, strtolower($tag_matchings[1])); } // add html-tag to $truncate'd text $truncate .= $line_matchings[1]; } // calculate the length of the plain text part of the line; handle entities as one character $content_length = strlen(preg_replace('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|[0-9a-f]{1,6};/i', ' ', $line_matchings[2])); if ($total_length+$content_length> $length) { // the number of characters which are left $left = $length - $total_length; $entities_length = 0; // search for html entities if (preg_match_all('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|[0-9a-f]{1,6};/i', $line_matchings[2], $entities, PREG_OFFSET_CAPTURE)) { // calculate the real length of all entities in the legal range foreach ($entities[0] as $entity) { if ($entity[1]+1-$entities_length <= $left) { $left--; $entities_length += strlen($entity[0]); } else { // no more characters left break; } } } $truncate .= substr($line_matchings[2], 0, $left+$entities_length); // maximum lenght is reached, so get off the loop break; } else { $truncate .= $line_matchings[2]; $total_length += $content_length; } // if the maximum length is reached, get off the loop if($total_length>= $length) { break; } } } else { if (strlen($text) <= $length) { return $text; } else { $truncate = substr($text, 0, $length - strlen($ending)); } } // if the words shouldn't be cut in the middle... if (!$exact) { // ...search the last occurance of a space... $spacepos = strrpos($truncate, ' '); if (isset($spacepos)) { // ...and cut the text in this position $truncate = substr($truncate, 0, $spacepos); } } // add the defined ending to the text $truncate .= $ending; if($considerHtml) { // close all unclosed html-tags foreach ($open_tags as $tag) { $truncate .= '</' . $tag . '>'; } } return $truncate; } ?>не<?php /** * truncateHtml can truncate a string up to a number of characters while preserving whole words and HTML tags * * @param string $text String to truncate. * @param integer $length Length of returned string, including ellipsis. * @param string $ending Ending to be appended to the trimmed string. * @param boolean $exact If false, $text will not be cut mid-word * @param boolean $considerHtml If true, HTML tags would be handled correctly * * @return string Trimmed string. */ function truncateHtml($text, $length = 100, $ending = '...', $exact = false, $considerHtml = true) { if ($considerHtml) { // if the plain text is shorter than the maximum length, return the whole text if (strlen(preg_replace('/<.*?>/', '', $text)) <= $length) { return $text; } // splits all html-tags to scanable lines preg_match_all('/(<.+?>)?([^<>]*)/s', $text, $lines, PREG_SET_ORDER); $total_length = strlen($ending); $open_tags = array(); $truncate = ''; foreach ($lines as $line_matchings) { // if there is any html-tag in this line, handle it and add it (uncounted) to the output if (!empty($line_matchings[1])) { // if it's an "empty element" with or without xhtml-conform closing slash if (preg_match('/^<(\s*.+?\/\s*|\s*(img|br|input|hr|area|base|basefont|col|frame|isindex|link|meta|param)(\s.+?)?)>$/is', $line_matchings[1])) { // do nothing // if tag is a closing tag } else if (preg_match('/^<\s*\/([^\s]+?)\s*>$/s', $line_matchings[1], $tag_matchings)) { // delete tag from $open_tags list $pos = array_search($tag_matchings[1], $open_tags); if ($pos !== false) { unset($open_tags[$pos]); } // if tag is an opening tag } else if (preg_match('/^<\s*([^\s>!]+).*?>$/s', $line_matchings[1], $tag_matchings)) { // add tag to the beginning of $open_tags list array_unshift($open_tags, strtolower($tag_matchings[1])); } // add html-tag to $truncate'd text $truncate .= $line_matchings[1]; } // calculate the length of the plain text part of the line; handle entities as one character $content_length = strlen(preg_replace('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|[0-9a-f]{1,6};/i', ' ', $line_matchings[2])); if ($total_length+$content_length> $length) { // the number of characters which are left $left = $length - $total_length; $entities_length = 0; // search for html entities if (preg_match_all('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|[0-9a-f]{1,6};/i', $line_matchings[2], $entities, PREG_OFFSET_CAPTURE)) { // calculate the real length of all entities in the legal range foreach ($entities[0] as $entity) { if ($entity[1]+1-$entities_length <= $left) { $left--; $entities_length += strlen($entity[0]); } else { // no more characters left break; } } } $truncate .= substr($line_matchings[2], 0, $left+$entities_length); // maximum lenght is reached, so get off the loop break; } else { $truncate .= $line_matchings[2]; $total_length += $content_length; } // if the maximum length is reached, get off the loop if($total_length>= $length) { break; } } } else { if (strlen($text) <= $length) { return $text; } else { $truncate = substr($text, 0, $length - strlen($ending)); } } // if the words shouldn't be cut in the middle... if (!$exact) { // ...search the last occurance of a space... $spacepos = strrpos($truncate, ' '); if (isset($spacepos)) { // ...and cut the text in this position $truncate = substr($truncate, 0, $spacepos); } } // add the defined ending to the text $truncate .= $ending; if($considerHtml) { // close all unclosed html-tags foreach ($open_tags as $tag) { $truncate .= '</' . $tag . '>'; } } return $truncate; } ?>
также см. здесь
Вот немного более короткий метод. Он не идет по дереву DOM, но он будет работать практически во всех ситуациях.
Этот метод сначала удаляет все html-теги из содержимого (поэтому html-теги не будут считаться также для длины строки). Затем, если строка должна быть усечена, она обрезает ее и снова вставляет все теги html.
<?php function short($string, $max = 255) { preg_match_all('/<[^>]+>/', $string, $tags); // Save tag information for later $stripped = preg_replace('/<[^>]+>/', '', $string); // Strip html tags // Truncate the string if needed if (strlen($stripped) > $max) { $truncated = mb_substr($stripped, 0, $max, 'utf-8'); // Insert html tags, if any if (sizeof($tags) > 0) { $pos = 0; foreach ($tags[0] as $tag) { $pos += strpos($string, $tag); // Get the position the tag should be inserted at $string = substr($string, $pos); // Shift to avoid issues with duplicate tags $truncated = substr_replace($truncated, $tag, $pos, 0); // Insert the tag } } $string = $truncated . '…'; } return $string; } echo short('I love @kevinrose\'s new website <a href="http://kevinrose.com">Link</a>. Here is a bit of additional text after the link.<a></a>', 50);