Description:
------------
While doing the migration from PHP 7.2 to PHP 7.3, we noticed an output change of strip_tags which broke some text parsing related code in our application. Since the release notes from PHP 7.3 only mentions the deprecation of strip tags stream filtering [1], we are wondering if this output change was an intended or not.

You can see the different output in https://3v4l.org/lE5Vb

[1] https://php.net/manual/en/migration73.deprecated.php#migration73.deprecated.core.strip-tags-streaming

Test script:
---------------
<?php

$s=<<<FOO
<script>if (i<j.length);</script>
hola<a href="foo">demo</a>
<script>
/* <![CDATA[ */

/* ]]> */
if(a>2);
</script>
demo
bar
FOO;

var_dump(strip_tags( $s, '<a>' ));

Expected result:
----------------
string(18) "if (i2);

demo
bar"

Actual result:
--------------
string(26) "if (i */
if(a2);

demo
bar"