How to Enable PHP5 with 1and1 Hosting
1and1 hosting by default has PHP4 enabled, and there is no options for you to choose. However, here is the knowledge on how you can enable PHP5 support for your application in 1and1.
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How to Enable PHP5 with 1and1 Hosting
smallwei


smallwei 8:31 pm on November 7, 2009
Add the following lines to the beginning of the .htaccess in your application’s root directory to enable PHP5.
Note: Only the directory and the sub-directories has .htaccess with the above lines will have PHP5 support, therefore if you can adjust accordingly for multiple apps in different directories with different requirements.