What are the functions of the error_log function in PHP?

The error_log function in PHP is used to log error messages or other information to the server’s error log file. Its features include:

1. Record error messages: you can use the error_log function to record custom error messages, so you can easily view or track issues while debugging your code.
2. Specify error level: You can designate the level of error messages by specifying the second parameter, for example using the constant LOG_ERR to indicate error messages or LOG_WARNING for warnings.
3. Designate log file: You can specify the destination for error messages to be recorded by providing the third parameter, which can be either a relative or absolute path.
4. Configure error handling: The behavior of the error_log function can be configured in the php.ini file, such as specifying the default error log file path and the format of error messages.