How can developers effectively trace function calls in PHP to identify the source of errors?

Developers can effectively trace function calls in PHP by using tools like Xdebug or setting up error logging to track function calls and identify the source of errors. By enabling Xdebug, developers can generate stack traces that show the path of function calls leading up to an error. Error logging can also be configured to log function calls along with other debugging information.

// Enable Xdebug for tracing function calls
xdebug_start_trace();

// Code where error occurs

// Stop Xdebug tracing
xdebug_stop_trace();