Question

How can I do the following? For example I have this text (it’s a source code):

Welcome to asdfasdf, <h2>Welcome</h2>, <a href="index.php?my_id=1">Homepage</a>,
<br />, Hi, this is some text. 
Check <a href="index.php?my_id=12945">this link</a> or 
<a href="index.php?my_id=138>this link</a> for more information.
<br /><strong>Thanks</strong>

Now I would like to search this string with php for “my_id” and display all the id’s. So the output would be:

1
12945
138

Hope you understand me. Thanks!

Answer 1

Here it is:

<?php

$str='Welcome to asdfasdf, <h2>Welcome</h2>, <a href="index.php?my_id=1">Homepage</a>,
<br />, Hi, this is some text. 
Check <a href="index.php?my_id=12945">this link</a> or 
<a href="index.php?my_id=138>this link</a> for more information.
<br /><strong>Thanks</strong>';


$res = array();
preg_match_all('~<a[^>]*?\?my_id=([0-9]+)[^>]*?>~uis', $str, $res);

print_r($res);

My regexp is not very strict, but it requires that ?my_id=123 appears inside <a> tag.