I am wondering if there is an elegant way to trim some text but while being HTML tag aware?

我想知道是否有一種優雅的方式來修剪一些文本但是在識別HTML標簽的同時？

For example, I have this string:

例如，我有這個字符串：

$data = 'some title text here that could get very long';

And let's say I need to return/output this string on a page but would like it to be no more than X characters. Let's say 35 for this example.

並且假設我需要在頁面上返回/輸出此字符串，但希望它不超過X個字符。讓我們說35這個例子。

Then I use:

然后我用：

$output = substr($data,0,20);

But now I end up with:

但現在我最終得到：

some title text here that

which as you can see the closing strong tags are discarded thus breaking the HTML display.

正如您所看到的那樣，關閉強標簽將被丟棄，從而打破HTML顯示。

Is there a way around this? Also note that it is possible to have multiple tags in the string for example:

有沒有解決的辦法？另請注意，可以在字符串中包含多個標記，例如：

some text here and here

3 个解决方案

#1

3

A few mounths ago I created a special function which is solution for your problem.

幾個mounths之前我創建了一個特殊功能，它可以解決您的問題。

Here is a function:

這是一個功能：

function substr_close_tags($code, $limit = 300)

{

if ( strlen($code) <= $limit )

{

return $code;

}

$html = substr($code, 0, $limit);

preg_match_all ( "#

foreach($result[1] AS $key => $value)

{

if ( strtolower($value) == 'br' )

{

unset($result[1][$key]);

}

}

$openedtags = $result[1];

preg_match_all ( "#([a-zA-Z]+)>#iU", $html, $result );

$closedtags = $result[1];

foreach($closedtags AS $key => $value)

{

if ( ($k = array_search($value, $openedtags)) === FALSE )

{

continue;

}

else

{

unset($openedtags[$k]);

}

}

if ( empty($openedtags) )

{

if ( strpos($code, ' ', $limit) == $limit )

{

return $html."...";

}

else

{

return substr($code, 0, strpos($code, ' ', $limit))."...";

}

}

$position = 0;

$close_tag = '';

foreach($openedtags AS $key => $value)

{

$p = strpos($code, (''.$value.'>'), $limit);

if ( $p === FALSE )

{

$code .= (''.$value.'>');

}

else if ( $p > $position )

{

$close_tag = ''.$value.'>';

$position = $p;

}

}

if ( $position == 0 )

{

return $code;

}

return substr($code, 0, $position).$close_tag."...";

}

這是演示：http：//sandbox.onlinephpfunctions.com/code/899d8137c15596a8528c871543eb005984ec0201(單擊“執行代碼”以檢查其工作原理)。

#2

0

Using @newbieuser his function, I had the same issue, like @pablo-pazos, that it was (not) breaking when $limit fell into an html tag (in my case
at the r)

使用@newbieuser他的功能，我遇到了同樣的問題，比如@ pablo-pazos，當$ limit落入html標簽時(在我的情況下，在r處)它是(不)破壞的

Fixed with some code

修復了一些代碼

if ( strlen($code) <= $limit ){

return $code;

}

$html = substr($code, 0, $limit);

//We must find a . or > or space so we are sure not being in a html-tag!

//In my case there are only

//If you have more tags, or html formatted text, you must do a little more and also use something like http://htmlpurifier.org/demo.php

$_find_last_char = strrpos($html, ".")+1;

if($_find_last_char > $limit/3*2){

$html_break = $_find_last_char;

}else{

$_find_last_char = strrpos($html, ">")+1;

if($_find_last_char > $limit/3*2){

$html_break = $_find_last_char;

}else{

$html_break = strrpos($html, " ");

}

}

$html = substr($html, 0, $html_break);

preg_match_all ( "#

......

#3

-3

substr(strip_tags($content), 0, 100)

substr(strip_tags($ content)，0,100)