Limit String Length

You can use the wordwrap() function then explode on newline and take the first part, if you don't want to split words.

$str = 'Stack Overflow is as frictionless and painless to use as we could make it.';
$str = wordwrap($str, 28);
$str = explode("\n", $str);
$str = $str[0] . '...';

Source: https://stackoverflow.com/a/1104329/1060423

If you don't care about splitting words, then simply use the php substr function.

echo substr($str, 0, 28) . '...';

From php 4.0.6 , there is a function for the exact same thing

function mb_strimwidth can be used for your requirement

<?php
echo mb_strimwidth("Hello World", 0, 10, "...");
//Hello W...
?>

It does have more options though,here is the documentation for this mb_strimwidth

You can use something similar to the below:

if (strlen($str) > 10)
   $str = substr($str, 0, 7) . '...';