Description:
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After upgrading from PHP 5.0.4 to 5.1.4, custom php.ini's are not being loaded from user's homedirs/public_html anymore (using PHP Su Exec). Looking around in different forums everyone seems to have this issue no matter what configuration you have, as long as it's PHP 5.1.x.

Expected result:
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To load php.ini under user homedir. For example clip from phpinfo();

Before adding php.ini should be:

Configuration File (php.ini) Path 	/usr/local/Zend/etc/php.ini


After adding custom php.ini under public_html:
/home/user/public_html/php.ini

Actual result:
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Before / After is always:

Configuration File (php.ini) Path 	/usr/local/Zend/etc/php.ini

Custom php.ini is not loaded.