<code>$str = '这是<div>一道<a href="http://www.baidu.com">php字符串</a>截取题</div>。'; </code>
Truncate the first 7 characters of the above string and display it. The final result should be this:
<code>'这是<div>一道<a href="http://www.baidu.com">php</a></div>' </code>
Requirements:
If there is an HTML tag in the string, skip it and don’t count it
If any HTML tags are truncated after interception, then the truncated tags must be added with a closing tag at the end
<code>$str = '这是<div>一道<a href="http://www.baidu.com">php字符串</a>截取题</div>。'; </code>
Truncate the first 7 characters of the above string and display it. The final result should be this:
<code>'这是<div>一道<a href="http://www.baidu.com">php</a></div>' </code>
Requirements:
If there is an HTML tag in the string, skip it and don’t count it
If any HTML tags are truncated after interception, then the truncated tags must be added with a closing tag at the end
I didn’t speculate on the purpose of the question, I simply wrote a regular replacement as required
<code class="php">function pure_cut($str, $len) { $reg = '/' . str_repeat('[^<>]((?:<[^>]+>)+)?', $len) . '$/u'; $str = preg_replace_callback($reg, function($matches) { array_shift($matches); $replace = join('', $matches); return $replace; }, $str, 7); return $str; } echo pure_cut($str, 7);</code>
But I don’t quite understand requirement 2. When requirement 1 is met, the html tag will not be damaged and does not need to be repaired.
It should be to capture the content of the rich text editing box.
<code class="php"><?php $str = '这是<div>一道<a href="http://www.baidu.com">php字符串</a>截取题</div>。'; function truncate($text, $length = 100, $ending = '...', $exact = false, $considerHtml = true) { if ($considerHtml) { if (mb_strlen(strip_tags($text)) <= $length) { return $text; } preg_match_all('/(<.+?>)?([^<>]*)/s', $text, $lines, PREG_SET_ORDER); $total_length = mb_strlen($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', $line_matchings[1])) { } else if (preg_match('/^<\s*\/([^\s]+?)\s*>$/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 = mb_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) { $left = $length - $total_length; $entities_length = 0; if (preg_match_all('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|[0-9a-f]{1,6};/i', $line_matchings[2], $entities, PREG_OFFSET_CAPTURE)) { foreach ($entities[0] as $entity) { if ($entity[1]+1-$entities_length <= $left) { $left--; $entities_length += mb_strlen($entity[0]); } else { break; } } } $truncate .= mb_substr($line_matchings[2], 0, $left+$entities_length); break; } else { $truncate .= $line_matchings[2]; $total_length += $content_length; } if($total_length >= $length) { break; } } } else { if (mb_strlen($text) <= $length) { return $text; } else { $truncate = mb_substr($text, 0, $length - mb_strlen($ending)); } } if (!$exact) { $spacepos = mb_strrpos($truncate, ' '); if (isset($spacepos)) { $truncate = mb_substr($truncate, 0, $spacepos); } } $truncate .= $ending; if($considerHtml) { foreach ($open_tags as $tag) { $truncate .= '</' . $tag . '>'; } } return $truncate; } echo truncate($str, 7, '', true, true);</code>