如何在php中截断字符串的一部分

Question

for example i have a text like

<p>
Quis vel accusantium libero. Suscipit officiis culpa
<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7">
libero quia ad.
</p>

and i want to check if the string has any data:image then truncate only this part so max char of 50, so the results become

<p>
Quis vel accusantium libero. Suscipit officiis culpa
<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH...">
libero quia ad.
</p>

am not sure how exactly to achieve that with preg_replace and "data:image.+?" pattern

Answer 1

You can do that in different ways, with preg_match(_all), preg_split, etc.

But with the preg_replace will work like this: run to see

<?php
$text='data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7';
$result=preg_replace('/(?<=data:image.{50}).*/', '', $text);

echo $result;