As we all know that to enable display_errors was an easy task. Unfortunately I've made more than 10 attempts to configure this.

Initially I was edit /Applications/MAMP/conf/php5.4.4/php.ini, it doesn't solve my problem. Then I've tried to edit all php.ini in each php version. Sadly, it failed again.

Finally, I echo out phpInfo() to see it's attributes, and the value of display_errors was Off. The path for php.ini was located in /Applications/MAMP/bin/php/php5.4.4/conf/php.ini. :|

Damn!