/** * 截取HTML,并自动补全闭合 * @param $html * @param $length * @param $end */ function subHtml($html,$length) { $result = ''; $tagStack = array(); $len = 0;
$contents = preg_split("~(<[^>]+?>)~si",$html, -1,PREG_SPLIT_NO_EMPTY| PREG_SPLIT_DELIM_CAPTURE); foreach($contents as $tag) { if (trim($tag)=="") continue; if(preg_match("~<([a-z0-9]+)[^/>]*?/>~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 .= $tag; } }else if(preg_match("~<([a-z0-9]+)[^/>]*?>~si",$tag,$match)){ array_push($tagStack,$match[1]); $result .= $tag; }else if(preg_match("~~si",$tag)){ $result .= $tag; }else{ if($len + mstrlen($tag) < $length){ $result .= $tag; $len += mstrlen($tag); }else { $str = msubstr($tag,0,$length-$len+1); $result .= $str; break; } } } while(!empty($tagStack)){ $result .= ''.array_pop($tagStack).'>'; } 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) { return $string; } if(strtolower($charset) == 'utf-8') { $n = $tn = $noc = 0; while($n < strlen($string)) { $t = ord($string[$n]); if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) { $tn = 1; $n++; } elseif(194 <= $t && $t <= 223) { $tn = 2; $n += 2; } elseif(224 <= $t && $t <= 239) { $tn = 3; $n += 3; } elseif(240 <= $t && $t <= 247) { $tn = 4; $n += 4; } elseif(248 <= $t && $t <= 251) { $tn = 5; $n += 5; } elseif($t == 252 || $t == 253) { $tn = 6; $n += 6; } else { $n++; } $noc++; if($noc >= $length) { break; } } if($noc > $length) { $n -= $tn; } $strcut = substr($string, 0, $n); } else { for($i = 0; $i < $length; $i++) { $strcut .= ord($string[$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); $length=count($ar[0]); } return $length; }
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