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You need to run PHP 5.2.0 or newer for Magento. This is normally not a problem for MAMP but a recent reader has asked about determining which version is running on their Mac when this error does occur. I just wanted to make a quick post on checking PHP versions in MAMP, because it seems if your Mac has other versions of php installed you can end up having odd results when trying to run Magento in MAMP.

You can determine which PHP version your MAMP server is running by opening the MAMP ’start page’ and clicking the phpInfo link in the top menu. This will also tell you which php.ini file is being used.

You can also run:

 php -version

Run this in a terminal (Terminal.app), to print the PHP version that is on your PATH. You can determine which php is being run by typing:

which php

To find any php binaries on your Mac you can run the locate command in a terminal:

locate php | grep "[^\.]php$"

The pipe into grep just filters out any files that have php in the path, but are not php binaries, and also removes any files that are of the form filename.php which would otherwise turn up in the search.

You can execute any of the php binaries this command finds with the argument -version to find out what version of PHP it is. This may help you to identify any versions of PHP you have installed that you do not want anymore.

For example:

/usr/bin/php -version
/Applications/MAMP/bin/php4/bin/php -version

If anyone has any other tips for solving this or questions please post them below. Hopefully we can make sure this problem doesn’t trip anyone else up!