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function cutstr($string, $length, $dot = ' ...') {
if(strlen($string) <= $length) {
return $string;
}
$pre = chr(1);
$end = chr(1);
$string = str_replace(array('&', '"', '<', '>'), array($pre.'&'.$end, $pre.'"'.$end, $pre.'<'.$end, $pre.'>'.$end), $string);
$strcut = '';
$n = $tn = $noc = 0;
while($n < strlen($string)) {
$t = ord($string[$n]);
if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
$tn = 1; $n++; $noc++;
} elseif(194 <= $t && $t <= 223) {
$tn = 2; $n += 2; $noc += 2;
} elseif(224 <= $t && $t <= 239) {
$tn = 3; $n += 3; $noc += 2;
} elseif(240 <= $t && $t <= 247) {
$tn = 4; $n += 4; $noc += 2;
} elseif(248 <= $t && $t <= 251) {
$tn = 5; $n += 5; $noc += 2;
} elseif($t == 252 || $t == 253) {
$tn = 6; $n += 6; $noc += 2;
} else {
$n++;
}
if($noc >= $length) {
break;
}
}
if($noc > $length) {
$n -= $tn;
}
$strcut = substr($string, 0, $n);
$strcut = str_replace(array($pre.'&'.$end, $pre.'"'.$end, $pre.'<'.$end, $pre.'>'.$end), array('&', '"', '<', '>'), $strcut);
$pos = strrpos($strcut, chr(1));
if($pos !== false) {
$strcut = substr($strcut,0,$pos);
}
return $strcut.$dot;
}
function substr_ignore_tags($str, $len = 0){
function strRepeat($str, $frequency){
if(!$frequency){
return ;
}
for($i = 0; $i < $frequency; $i++){
$str .= $str;
}
return $str;
}
$str = preg_replace('#(</?[^>]+>)#', chr(9) . '\1', $str);
$arr = explode(chr(9), $str);
if(count($arr) == 1){
return $str;
}
$str = '';
while(strlen(strip_tags($str)) < $len){
$_str = array_shift($arr);
$strLen = strlen(strip_tags($str));
$_strLen = strlen(strip_tags($_str));
if($strLen + $_strLen >= $len){
$getLen = $len - $strLen;
preg_match_all('#(</?[^>]+>)#', $_str, $match);
if(!isset($match[0][0])){
return $_str;
}
$endTag = $match[0][0];
$str .= $endTag . substr(strip_tags($_str), 0, $getLen);
break;
}else{
$str .= $_str;
}
}
preg_match_all('#(</?[^>]+>)#', $str, $match);
$allTags = array_reverse($match[0]);
$_allTags = array();
foreach($allTags as $tag){
if(strpos($tag, '</') !== false){
preg_match('#</([^>]+)>#', $tag, $_tag);
if(isset($_allTags[trim($_tag[1])]['n_num'])){
$_allTags[trim($_tag[1])]['n_num'] += 1;
}else{
$_allTags[trim($_tag[1])] = array('s_num' => 0, 'n_num' => 1);
}
}else{
preg_match('#<([^ ]+)([^>]*)>#', $tag, $_tag);
if(isset($_allTags[trim($_tag[1])]['s_num'])){
$_allTags[trim($_tag[1])]['s_num'] += 1;
}else{
$_allTags[trim($_tag[1])] = array('s_num' => 1, 'n_num' => 0);
}
}
}
foreach($_allTags as $tag => $info){
$str .= strRepeat('</' . $tag . '>', $info['n_num'] - $info['s_num']);
}
return $str;
}
$str = 'aaaaa<span style="color: red">bbbbb<b>ccccc</b>ddddd</span>eeeee';
$len = 6;
echo substr_ignore_tags($str, $len);