php截取html字符串自动补全html标签
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2022-05-20 15:57:33
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文章来总结一下关于利用php截取html字符串自动补全html标签,实际开发中会经常碰到,很多人直接先strip_tags过滤掉html标签,但是就只剩下纯文本了,可读性非常差,下面是一个函数,代码如下:
]+?>)~si", $html, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE); foreach ($contents as $tag) { if (trim($tag) == "") & nbsp; continue; if (preg_match("~]*?/>~si", $tag)) { $result.= $tag; } else if (preg_match("~([a-z0-9]+)[^/>]*?>~si", $tag, $match)) { if ($tagStack[count($tagStack) - 1] == $match[1]) { array_pop($tagStack); $result.= $tag; } } else if (preg_match("~]*?>~si", $tag, $match)) { array_push($tagStack, $match[1]); $result.= $tag; } else if (preg_match("~~si", $tag)) { $result.= $tag; } else { if ($len + mstrlen($tag) '; } return $result; } /** * 截取中文字符串 * @param $string 字符串 * @param $start 起始位 * @param $length 长度 * @param $charset 编码 * @param $dot 附加字串 */ function msubstr($string, $start, $length, $dot = '', $charset = 'UTF-8') { $string = str_replace(array( '&', '"', '<', '>', ' ' ) , array( '&', '"', '', ' ' ) , $string); if (strlen($string) = $length) { break; } } if ($noc > $length) { $n-= $tn; } $strcut = substr($string, 0, $n); } else { for ($i = 0; $i 127 ? $string[$i] . $string[++$i] : $string[$i]; } } return $strcut . $dot; } /** * 取得字符串的长度,包括中英文。 */ function mstrlen($str, $charset = 'UTF-8') { if (function_exists('mb_substr')) { $length = mb_strlen($str, $charset); } elseif (function_exists('iconv_substr')) { $length = iconv_strlen($str, $charset); } else { preg_match_all("/[x01-x7f]|[xc2-xdf][x80-xbf]|xe0[xa0-xbf][x80-xbf]|[xe1-xef][x80-xbf][x80-xbf]|xf0[x90-xbf][x80-xbf][x80-xbf]|[xf1-xf7][x80-xbf][x80-xbf][x80-xbf]/", $text, $ar); & nbsp; $length = count($ar[0]); } return $length; } ?>
实例,代码如下:
= $leng) return $str; $word = 0; $i = 0; /** 字符串指针 **/ $stag = array( array() ); /** 存放开始HTML的标志 **/ $etag = array( array() ); /** 存放结束HTML的标志 **/ $sp = 0; $ep = 0; while ($word != $num) { if (ord($str[$i]) > 128) { //$re.=substr($str,$i,3); $i+= 3; $word++; } else if ($str[$i] == '') { $ptag[$k][] = $str[$i]; continue; } else { $ptag[$k] = implode('', $ptag[$k]); $k++; break; } } $i++; continue; } else { //$re.=substr($str,$i,1); $word++; $i++; } } foreach ($etag as $val) { $key1 = array_search($val, $stag); if ($key1 !== false) unset($stag[$key]); } foreach ($stag as $key => $val) { if (in_array($val, array( 'br', 'img' ))) unset($stag[$key1]); } array_reverse($stag); $ends = '' . implode('>', $stag) . '>'; $re = substr($str, 0, $i) . $ends; if ($more) $re.= '...'; return $re; } ?>
PHP截取字符串,生成文章摘要,我们在写BLOG时经常需要显示文章前一部分,但是又怕不恰当截断破坏封闭标签以造成整个文档结构破坏,代码如下:
]*(>?)"; $Single = "/BASE|META|LINK|HR|BR|PARAM|IMG|AREA|INPUT|BR/i"; $Stack = array(); $posStack = array(); mb_ereg_search_init($Foremost, $re, 'i'); while ($pos = mb_ereg_search_pos()) { $match = mb_ereg_search_getregs(); /* [Child-matching Formulation]: $matche[1] : A "/" charactor indicating whether current "<...>" Friction is Closing Part $matche[2] : Element Name. $matche[3] : Right > of a "<...>" Friction */ if ($match[1] == "") { $Elem = $match[2]; if (mb_eregi($Single, $Elem) && $match[3] != "") { continue; } ?>
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