What is the purpose of `error_reporting()` in PHP?

`error_reporting()` is a function that allows you to control which types of PHP errors are reported. You can specify error levels like `E_ALL`, `E_WARNING`, `E_NOTICE`, `E_ERROR`, etc. Setting it to `E_ALL` reports all errors, while setting it to `0` suppresses all error reporting. It's crucial for debugging and production environments.