If you are running Joomla 1.0.15 and your provider upgrades from PHP 5.2 to 5.3 you will be faced with a lot of error messages of the type:
Assigning the return value of new by reference is deprecated
Function eregi() is deprecated
Function eregi_replace() is deprecated
Function split() is deprecated
Deprecated: Function set_magic_quotes_runtime() is deprecated
To fix this situation if you are going to continue run Joomla 1.0.15 on PHP 5.3 you have several choices: Firstly, find a friendly host that will continue to run PHP 5.2 for you. This is possible but let us be honest this is only a temporary solution as PHP 5.2 will eventually be shelved by everyone and when 5.3 is rolled out everywhere, you will be left out in the cold. It is only a matter of time. However, if you do need such a friendly host then contact me and I'll provide the details.