I was given a VM at my company to install web software on. But I came across a rather bizarre issue where PHP variables would be overwritten (rewritten) by the server if they matched a specific pattern. What could rewrite PHP variables like this?
The following is as an entire standalone script.
<?php foo = 'b.domain.com'; echo $foo; // 'dev01.sandbox.b.domain.com' $bar = 'dev01.sandbox.domain.com'; echo $bar; // 'dev01.sandbox.sandbox.domain.com' $var = 'b.domainfoo.com'; echo $var; // 'b.domainfoo.com' (not overwritten because it didn't match whatever RegEx has been set) ?>
Essentially any variable which contains a subdomain and matches on the domain name would be rewritten. This isn't something mod_rewrite would be able to touch, so it has to be something at the server level that is parsing out PHP and rewriting a string if it matches a RegEx.