Enabling Xdebug on MAMP

Add something like the following to your php.ini:

[xdebug]
zend_extension="/Applications/MAMP/bin/php/php5.6.7/lib/php/extensions/no-debug-non-zts-20131226/xdebug.so"
;xdebug.default_enable=1
xdebug.remote_enable=1
xdebug.remote_handler=dbgp
xdebug.remote_mode=req
xdebug.remote_host=127.0.0.1
xdebug.remote_port=9000
;xdebug.remote_autostart=1

There are good instructions for setting up Xdebug on MAMP here http://www.human-element.com/xdebug-setup-mamp-aptana/ and here https://www.jetbrains.com/phpstorm/help/configuring-xdebug.html.