Which function is used in PHP to set the error reporting level?

The function used in PHP to set the error reporting level is error_reporting(). This function allows you to specify which types of errors you want PHP to report, leveraging constants provided by PHP to control the visibility of errors, warnings, and notices during script execution.

When you call error_reporting(), you can pass in a combination of predefined constants such as E_ALL, E_WARNING, E_NOTICE, and so forth. This flexibility enables developers to adjust the error reporting level based on the environment (for example, a development or production context), ensuring that only the relevant errors are displayed or logged.

Other options listed do not correspond to any valid PHP function for controlling error reporting levels. Specifically, error_set(), set_error(), and report_errors() do not exist in PHP's built-in functions related to error handling. Understanding how to effectively use error_reporting() is essential for debugging and maintaining the robustness of PHP applications.