有没有办法在不编写自己的函数的情况下完成此操作?
例如:
$text = 'Test <span><a>something</a> something else</span>.';
$text = cutText($text, 2, null, 20, true);
//result: Test <span><a>something</a></span>
我需要让这个功能坚不可摧
我的问题类似于 This thread 但我需要一个更好的解决方案。我想保持嵌套标签不变。
到目前为止,我的算法是:
function cutText($content, $max_words, $max_chars, $max_word_len, $html = false) {
$len = strlen($content);
$res = '';
$word_count = 0;
$word_started = false;
$current_word = '';
$current_word_len = 0;
if ($max_chars == null) {
$max_chars = $len;
}
$inHtml = false;
$openedTags = array();
for ($i = 0; $i<$max_chars;$i++) {
if ($content[$i] == '<' && $html) {
$inHtml = true;
}
if ($inHtml) {
$max_chars++;
}
if ($html && !$inHtml) {
if ($content[$i] != ' ' && !$word_started) {
$word_started = true;
$word_count++;
}
$current_word .= $content[$i];
$current_word_len++;
if ($current_word_len == $max_word_len) {
$current_word .= '- ';
}
if (($content[$i] == ' ') && $word_started) {
$word_started = false;
$res .= $current_word;
$current_word = '';
$current_word_len = 0;
if ($word_count == $max_words) {
return $res;
}
}
}
if ($content[$i] == '<' && $html) {
$inHtml = true;
}
}
return $res;
}
但当然不行。我想过要记住打开的标签并关闭它们,如果它们没有关闭但可能有更好的方法吗?
答案 0 :(得分:2)
这对我很有用:
function trimContent ($str, $trimAtIndex) {
$beginTags = array();
$endTags = array();
for($i = 0; $i < strlen($str); $i++) {
if( $str[$i] == '<' )
$beginTags[] = $i;
else if($str[$i] == '>')
$endTags[] = $i;
}
foreach($beginTags as $k=>$index) {
// Trying to trim in between tags. Trim after the last tag
if( ( $trimAtIndex >= $index ) && ($trimAtIndex <= $endTags[$k]) ) {
$trimAtIndex = $endTags[$k];
}
}
return substr($str, 0, $trimAtIndex);
}
答案 1 :(得分:1)
尝试这样的事情
function cutText($inputText, $start, $length) {
$temp = $inputText;
$res = array();
while (strpos($temp, '>')) {
$ts = strpos($temp, '<');
$te = strpos($temp, '>');
if ($ts > 0) $res[] = substr($temp, 0, $ts);
$res[] = substr($temp, $ts, $te - $ts + 1);
$temp = substr($temp, $te + 1, strlen($temp) - $te);
}
if ($temp != '') $res[] = $temp;
$pointer = 0;
$end = $start + $length - 1;
foreach ($res as &$part) {
if (substr($part, 0, 1) != '<') {
$l = strlen($part);
$p1 = $pointer;
$p2 = $pointer + $l - 1;
$partx = "";
if ($start <= $p1 && $end >= $p2) $partx = "";
else {
if ($start > $p1 && $start <= $p2) $partx .= substr($part, 0, $start-$pointer);
if ($end >= $p1 && $end < $p2) $partx .= substr($part, $end-$pointer+1, $l-$end+$pointer);
if ($partx == "") $partx = $part;
}
$part = $partx;
$pointer += $l;
}
}
return join('', $res);
}
参数:
<小时/> 示例#1 - 删除前3个字符
$text = 'Test <span><a>something</a> something else</span>.';
$text = cutText($text, 0, 3);
var_dump($text);
输出(删除“Tes”)
string(47) "t <span><a>something</a> something else</span>."
删除前10个字符
$text = cutText($text, 0, 10);
输出(删除“Test somet”)
string(40) "<span><a>hing</a> something else</span>."
示例2 - 删除内部字符 - “测试”中的“es”
$text = cutText($text, 1, 2);
输出
string(48) "Tt <span><a>something</a> something else</span>."
删除“东西el”
$text = cutText($text, 9, 18);
输出
string(32) "Test <span><a>some</a>se</span>."
希望这有帮助。
嗯,也许这不是最好的解决方案,但这是我目前所能做的一切。
答案 2 :(得分:1)
好的,我解决了这件事。
我把它分为两部分。 首先剪切文本而不破坏html:
function cutHtml($content, $max_words, $max_chars, $max_word_len) {
$len = strlen($content);
$res = '';
$word_count = 0;
$word_started = false;
$current_word = '';
$current_word_len = 0;
if ($max_chars == null) {
$max_chars = $len;
}
$inHtml = false;
$openedTags = array();
$i = 0;
while ($i < $max_chars) {
//skip any html tags
if ($content[$i] == '<') {
$inHtml = true;
while (true) {
$res .= $content[$i];
$i++;
while($content[$i] == ' ') { $res .= $content[$i]; $i++; }
//skip any values
if ($content[$i] == "'") {
$res .= $content[$i];
$i++;
while(!($content[$i] == "'" && $content[$i-1] != "\\")) {
$res .= $content[$i];
$i++;
}
}
//skip any values
if ($content[$i] == '"') {
$res .= $content[$i];
$i++;
while(!($content[$i] == '"' && $content[$i-1] != "\\")) {
$res .= $content[$i];
$i++;
}
}
if ($content[$i] == '>') { $res .= $content[$i]; $i++; break;}
}
$inHtml = false;
}
if (!$inHtml) {
while($content[$i] == ' ') { $res .= $content[$i]; $letter_count++; $i++; } //skip spaces
$word_started = false;
$current_word = '';
$current_word_len = 0;
while (!in_array($content[$i], array(' ', '<', '.', ','))) {
if (!$word_started) {
$word_started = true;
$word_count++;
}
$current_word .= $content[$i];
$current_word_len++;
if ($current_word_len == $max_word_len) {
$current_word .= '-';
$current_word_len = 0;
}
$i++;
}
if ($letter_count > $max_chars) {
return $res;
}
if ($word_count < $max_words) {
$res .= $current_word;
$letter_count += strlen($current_word);
}
if ($word_count == $max_words) {
$res .= $current_word;
$letter_count += strlen($current_word);
return $res;
}
}
}
return $res;
}
接下来就是关闭未关闭的标签:
function cleanTags(&$html) {
$count = strlen($html);
$i = -1;
$openedTags = array();
while(true) {
$i++;
if ($i >= $count) break;
if ($html[$i] == '<') {
$tag = '';
$closeTag = '';
$reading = false;
//reading whole tag
while($html[$i] != '>') {
$i++;
while($html[$i] == ' ') $i++; //skip any spaces (need to be idiot proof)
if (!$reading && $html[$i] == '/') { //closing tag
$i++;
while($html[$i] == ' ') $i++; //skip any spaces
$closeTag = '';
while($html[$i] != ' ' && $html[$i] != '>') { //start reading first actuall string
$reading = true;
$html[$i] = strtolower($html[$i]); //tags to lowercase
$closeTag .= $html[$i];
$i++;
}
$c = count($openedTags);
if ($c > 0 && $openedTags[$c-1] == $closeTag) array_pop($openedTags);
}
if (!$reading) //read only tag
while($html[$i] != ' ' && $html[$i] != '>') { //start reading first actuall string
$reading = true;
$html[$i] = strtolower($html[$i]); //tags to lowercase
$tag .= $html[$i];
$i++;
}
//skip any values
if ($html[$i] == "'") {
$i++;
while(!($html[$i] == "'" && $html[$i-1] != "\\")) {
$i++;
}
}
//skip any values
if ($html[$i] == '"') {
$i++;
while(!($html[$i] == '"' && $html[$i-1] != "\\")) {
$i++;
}
}
if ($reading && $html[$i] == '/') { //self closed tag
$tag = '';
break;
}
}
if (!empty($tag)) $openedTags[] = $tag;
}
}
while (count($openedTags) > 0) {
$tag = array_pop($openedTags);
$html .= "</$tag>";
}
}
这不是白痴证明,但是可以清除这个东西,所以不需要进一步的清洁。
它可能有点长,但我认为它不会占用大量资源,它应该比正则表达式更快。</ p>