How to configure PHP to display detailed errors instead of error 500 page?

I have a PHP application deployed on my IIS hosting and I am always getting generic IIS "error 500" pages insteady of detailed error pages.

I understand I need to modify some php.ini file (from this question).

It seems that display_errors is set correctly:

echo ini_get('display_errors');

outputs 1.

I have also tried setting display_errors and error_reporting in the function that causes the error (I know the particular function is the problem because I manually modified it).

function sendEmail( $aForm, $sFile = 'messages.tpl', $sTargetEmail = null ){ 
  error_reporting(E_ALL);
  ini_set('display_errors', 'On');
  //rest of the function

EDIT: I know I should have set these values in some php.ini file - how can I specify php.ini values on a shared hosting, when I have only access to my app folder via FTP?

How can I identify the error details?

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How to configure PHP to display detailed errors instead of error 500 page?

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