Fix Argument Count Error in phpagi_error_handler() for PHP 8 Compatibility

[janduy]

Summary

This PR removes the $context parameter from the phpagi_error_handler() function to resolve an "ArgumentCountError" that occurs in PHP 8.1 when using set_error_handler().

Problem

In PHP 8.1, set_error_handler() only passes 4 arguments by default:

• $level
• $message
• $file
• $line

However, phpagi_error_handler() is currently defined with 5 parameters:

function phpagi_error_handler($level, $message, $file, $line, $context)

Problem

PHP Fatal error: Uncaught ArgumentCountError: Too few arguments to function phpagi_error_handler(), 4 passed and exactly 5 expected

Solution

• The $context parameter is not used anywhere in the function, so it is safe to remove it.
• This change ensures full compatibility with PHP 8.1 while maintaining the expected behavior.

Changes in This PR

• Modified phpagi_error_handler() to accept only 4 parameters (removing $context).
• Updated send_error_email() to align with the new function signature.

Before (causing error in PHP 8.1)

function phpagi_error_handler($level, $message, $file, $line, $context)

After (fixes PHP 8.1 error)

function phpagi_error_handler($level, $message, $file, $line)

Impact

✅ Fixes compatibility issues in PHP 8.1
✅ No change in behavior, as $context was never used
✅ Improves stability for projects using PHP 8.1+

Testing

• Tested with PHP 8.1.
• No regression found in error handling functionality.