Description:
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str_ireplace() causes errors with some particular inputs.  If you save the following line into test.php:
<?php echo str_ireplace("\r", '', 'interclub_test@p-s.co.nz'); ?>

and try to load it in a browser, the browser will ask what to do with the php file instead of running it as normal.  E.g. "Opening test.php.  You have chosen to open test.php which is a: PHP Coder File from: http://www.psal.co.nz.  What should Firefox do with this file? etc".

A demo is at www.psal.co.nz/test.php. The case sensitive version str_replace() does not have the same problem, and str_ireplace() often works depending what is thrown at it.

Actually the PHP version is 5.2.1 but I can't upgrade to the latest for testing because I am using shared hosting and they use 5.2.1. I apologise if the bug has vanished in a more recent version but this is pretty easy to test.

Reproduce code:
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<?php echo str_ireplace("\r", '', 'interclub_test@p-s.co.nz'); ?>

Expected result:
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interclub_test@p-s.co.nz

Actual result:
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The browser will ask what to do with the php file.  E.g. "Opening test.php.  You have chosen to open test.php which is a: PHP Coder File from: http://www.psal.co.nz.  What should Firefox do with this file?" etc.