Why MAMP doesn't display errors?

Solution 1:

MAMP sets up a few different php.ini files for the server, the client etc. Check in your phpinfo() which php.ini actually is read. Looks like you're editing the wrong one.

Solution 2:

There are two php.ini files on MAMP. You should change both php.ini files.

1. Applications/MAMP/bin/php/'php version you are using(php5.5.10)'/conf/php.ini
2. Applications/MAMP/conf/php/'php version you are using(php5.5.10)'/conf/php.ini

Then change:

display_errors = Off 

to:

display_errors = On

Solution 3:

If you're using MAMP PRO, you've to enable Error handling (PHP) in the UI interface which should contain at least two the main options: 'Display startup errors' and set output 'To: Display'.

Display startup errors option is equivalent to display_startup_errors (in PHP) and To: Display to display_errors.

See below: