blocks|key|1269834|text|我可以修改一下帕兰的代码吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1269835|$truncated+=+(strlen($string)+>+20)+?+substr($string,+0,+20)+.+'...'+:+$string;|code-block|syntax|javascript|1269836|这不会添加“...”如果它更短的话。|1269837|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

May I make a modification to pallan's code?

<pre><code>$truncated = (strlen($string) &gt; 20) ? substr($string, 0, 20) . '...' : $string;
</code></pre>

This doesn't add the '...' if it is shorter.

blocks|key|1269921|text|为了避免在单词中间进行剪切，您可能希望尝试使用wordwrap函数；我想，可以这样做：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1269922|$str+=+"this+is+a+long+string+that+should+be+cut+in+the+middle+of+the+first+'that'";
$wrapped+=+wordwrap($str,+25);
var_dump($wrapped);

$lines+=+explode("\n",+$wrapped);
var_dump($lines);

$new_str+=+$lines[0]+.+'...';
var_dump($new_str);|code-block|syntax|javascript|1269923|$wrapped将包含：|1269924|string+'this+is+a+long+string
that+should+be+cut+in+the
middle+of+the+first
'that''+(length=74)|1269925|$lines数组将如下所示：|1269926|array
++0+=>+string+'this+is+a+long+string'+(length=21)
++1+=>+string+'that+should+be+cut+in+the'+(length=25)
++2+=>+string+'middle+of+the+first'+(length=19)
++3+=>+string+''that''+(length=6)|1269927|最后，您的$new_string：|1269928|string+'this+is+a+long+string'+(length=21)|1269929|使用子字符串，如下所示：|1269930|var_dump(substr($str,+0,+25)+.+'...');|1269931|你会得到：|1269932|string+'this+is+a+long+string+tha...'+(length=28)|1269933|这看起来不是很好:-(|1269934|不过，祝你玩得开心！|1269935|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/wordwrap^0|N|8|N|8|0|0|0|0|8|0|0|0|6|0|0|5|B|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1G|8|@$9|1H|A|1I|B|C]]|D|@$9|1J|A|1K|1|1L]]|E|$]]|$1|F|3|G|5|H|7|1M|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1N|8|@$9|1O|A|1P|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|1Q|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1R|8|@$9|1S|A|1T|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|H|7|1U|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|1V|8|@$9|1W|A|1X|B|C]]|D|@]|E|$]]|$1|U|3|V|5|H|7|1Y|8|@]|D|@]|E|$I|J]]|$1|W|3|X|5|6|7|1Z|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|H|7|20|8|@]|D|@]|E|$I|J]]|$1|10|3|11|5|6|7|21|8|@]|D|@]|E|$]]|$1|12|3|13|5|H|7|22|8|@]|D|@]|E|$I|J]]|$1|14|3|15|5|6|7|23|8|@]|D|@]|E|$]]|$1|16|3|17|5|6|7|24|8|@]|D|@]|E|$]]|$1|18|3|-4|5|6|7|25|8|@]|D|@]|E|$]]]|19|$1A|$5|1B|1C|1D|E|$1E|1F]]]]

To avoid cutting right in the middle of a word, you might want to try the <a href="http://php.net/wordwrap" rel="noreferrer"><code>wordwrap</code></a> function ; something like this, I suppose, could do :

<pre><code>$str = "this is a long string that should be cut in the middle of the first 'that'";
$wrapped = wordwrap($str, 25);
var_dump($wrapped);

$lines = explode("\n", $wrapped);
var_dump($lines);

$new_str = $lines[0] . '...';
var_dump($new_str);
</code></pre>

<code>$wrapped</code> will contain :

<pre><code>string 'this is a long string
that should be cut in the
middle of the first
'that'' (length=74)
</code></pre>

The <code>$lines</code> array will be like :

<pre><code>array
 0 =&gt; string 'this is a long string' (length=21)
 1 =&gt; string 'that should be cut in the' (length=25)
 2 =&gt; string 'middle of the first' (length=19)
 3 =&gt; string ''that'' (length=6)
</code></pre>

And, finally, your <code>$new_string</code> :

<pre><code>string 'this is a long string' (length=21)
</code></pre>

 
With a substr, like this :

<pre><code>var_dump(substr($str, 0, 25) . '...');
</code></pre>

You'd have gotten :

<pre><code>string 'this is a long string tha...' (length=28)
</code></pre>

Which doesn't look that nice :-(

 
Still, have fun !

blocks|key|1269643|text|很快的，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1269644|$truncated+=+substr('12345678901234567890abcdefg',+0,+20)+.+'...'|code-block|syntax|javascript|1269645|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Really quickly,

<pre><code>$truncated = substr('12345678901234567890abcdefg', 0, 20) . '...'
</code></pre>

blocks|key|1484681|text|这个方法很短，并且考虑到了单词边界，它没有使用循环，这使得它非常有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1484682|function+truncate($str,+$chars,+$end+=+'...')+{
++++if+(strlen($str)+<=+$chars)+return+$str;
++++$new+=+substr($str,+0,+$chars+%2B+1);
++++return+substr($new,+0,+strrpos($new,+'+'))+.+$end;
}|code-block|syntax|javascript|1484683|用法：|1484684|truncate('My+string',+5);+//returns:+My...|1484685|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

This one is short and takes word boundary into account, it doesn't use loops which makes it very efficient

<pre><code>function truncate($str, $chars, $end = '...') {
 if (strlen($str) &lt;= $chars) return $str;
 $new = substr($str, 0, $chars + 1);
 return substr($new, 0, strrpos($new, ' ')) . $end;
}
</code></pre>

Usage:

<pre><code>truncate('My string', 5); //returns: My...
</code></pre>

blocks|key|1484545|text|$words=explode('+',+$string);
for($ii+=+0,$j=0;+$ii<+5+&&+$j+<+sizeof($words)+;$j%2B%2B){
++++$ii+%2B=+strlen($words[$j]);
++++$intro=+$words[$j].+"+";++++
}
$intro.=+"...";|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1484546|我知道为时已晚，但如果其他人要返回这个页面，这就行了，|unstyled|1484547|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>$words=explode(' ', $string);
for($ii = 0,$j=0; $ii&lt; 5 &amp;&amp; $j &lt; sizeof($words) ;$j++){
 $ii += strlen($words[$j]);
 $intro= $words[$j]. " "; 
}
$intro.= "...";
</code></pre>

I know its to late, but if anyone else is returning to this page, this will do,

blocks|key|1484189|text|substr函数是最适合您的函数|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1484190|entityMap|0|LINK|mutability|MUTABLE|url|http://us2.php.net/manual/en/function.substr.php^0|0|6|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

<a href="http://us2.php.net/manual/en/function.substr.php" rel="nofollow noreferrer">substr</a> function is the right one for you

blocks|key|1269730|text|您正在寻找substr方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1269731|$s+=+substr($input,+0,+25);|code-block|syntax|javascript|1269732|这将使您获得字符串的第一个chuck，然后您可以将您想要的任何内容附加到最后。|1269733|entityMap|0|LINK|mutability|MUTABLE|url|http://us2.php.net/manual/en/function.substr.php^0|5|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

You're looking for the <a href="http://us2.php.net/manual/en/function.substr.php" rel="nofollow noreferrer">substr</a> method.

<pre><code>$s = substr($input, 0, 25);
</code></pre>

This will get you the first chuck of the string and then you can append whatever you'd like to the end.

blocks|key|1270074|text|我会采用Pascal+MARTIN的答案，并做了一些额外的改进。因为；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1270075|1-+"PHP+wordwrap"，自动遵守单词边界|1270076|2-如果你的字符串包含一个超过25个字符的单词(aagh，所以没有什么可做的)，你可以强制"PHP+wordwrap“剪切单词。(改进)|1270077|3-如果字符串少于25个字符，则"...“在一个完整的句子之后看起来会很丑陋。|1270078|$str+=+"This+string+might+be+longer+than+25+chars,+or+might+not!";
//+we+are+forcing+to+cut+long+words...
$wrapped+=+wordwrap($str,+25,+"\n",+1);
var_dump($wrapped);

$lines+=+explode("\n",+$wrapped);
var_dump($lines);

//+if+our+$str+is+shorter+than+25,+there+will+be+no+$lines[1]
(array_key_exists('1',+$lines))+?+$suffix+=+'...'+:+$suffix+=+'';
$new_str+=+$lines[0]+.+$suffix;
var_dump($new_str);|code-block|syntax|javascript|1270079|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|R|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I would go with Pascal MARTIN's answer, with some additional improvements. Because;

1 - "PHP wordwrap", respects word boundaries automatically

2 - If your string contains a word more than 25 chars(aagh, so there is nothing to do) you can force "PHP wordwrap" to cut word.(improvement)

3 - If your string is shorter than 25 chars, then "..." will seem ugly after a complete sentence.(improvement)

<pre><code>$str = "This string might be longer than 25 chars, or might not!";
// we are forcing to cut long words...
$wrapped = wordwrap($str, 25, "\n", 1);
var_dump($wrapped);

$lines = explode("\n", $wrapped);
var_dump($lines);

// if our $str is shorter than 25, there will be no $lines[1]
(array_key_exists('1', $lines)) ? $suffix = '...' : $suffix = '';
$new_str = $lines[0] . $suffix;
var_dump($new_str);
</code></pre>

blocks|key|1269656|text|<?php+echo+substr('12345678901234567890abcdefg',+0,+20)+.+'...'+?>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1269657|http://fr.php.net/manual/en/function.substr.php|unstyled|offset|length|1269658|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1B|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|Q|8|@]|9|@$G|R|H|S|1|T]]|A|$]]|$1|I|3|-4|5|F|7|U|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|E]]]]

<pre><code>&lt;?php echo substr('12345678901234567890abcdefg', 0, 20) . '...' ?&gt;
</code></pre>

<a href="http://fr.php.net/manual/en/function.substr.php" rel="nofollow noreferrer">http://fr.php.net/manual/en/function.substr.php</a>

blocks|key|1484356|text|+echo+substr($str,0,25)."...";|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1484357|可以做到这一点，但是如果你正在处理单词，你可能想要切断单词边界，这样你就不会有不完整的单词了。|unstyled|1484358|因此，要做到这一点(从我的头顶粗糙)：|1484359|$words+=+split("+",+strlen($str));

for($i+=+0,$j=0;+$i<+25+&&+$j+<+sizeof($words)+;$j%2B%2B)
{
++++$i+%2B=+strlen($words[$j]);
++++echo+$words[$j].+"+";++++
}
echo+"...";|1484360|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$B|C]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code> echo substr($str,0,25)."...";
</code></pre>

Would do the trick, but if you are dealing with words, you might want to cut off on word boundries so you don't have partial word doig this: The quick bl...

So to do that (crude off the top of my head):

<pre><code>$words = split(" ", strlen($str));

for($i = 0,$j=0; $i&lt; 25 &amp;&amp; $j &lt; sizeof($words) ;$j++)
{
 $i += strlen($words[$j]);
 echo $words[$j]. " "; 
}
echo "...";
</code></pre>

I have two string that i want to limit to lets say the first 25 characters for example. Is there a way to cut off text after the 25th character and add a ... to the end of the string?

So '12345678901234567890abcdefg'
would turn into '12345678901234567890abcde...' where 'fg' is cut off.

How do you cut off text after a certain amount of characters in PHP?

我有两个字符串，我想将其限制为前25个字符。有没有办法去掉第25个字符之后的文字，然后加上一个...到字符串的末尾？所以'12345678901234567890abcdefg‘会变成'12345678901234567890abcde...’其中'fg‘被截断。

问如何在PHP中截取一定数量的字符后的文本？
EN

回答 10

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问如何在PHP中截取一定数量的字符后的文本？
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