What are the best practices for handling internal server errors or misconfigurations in PHP applications?

When handling internal server errors or misconfigurations in PHP applications, it is important to provide a user-friendly error message to the end user while logging detailed error information for the developer to troubleshoot the issue. This can be achieved by setting the display_errors directive to off in the php.ini file and using the error_log directive to specify a file where PHP errors should be logged.

// Set error reporting level and log errors to a file
ini_set('display_errors', 0);
ini_set('log_errors', 1);
ini_set('error_log', '/path/to/error.log');

// Custom error handling function
function customErrorHandler($errno, $errstr, $errfile, $errline) {
    error_log("Error: [$errno] $errstr in $errfile on line $errline");
    echo "An internal server error has occurred. Please try again later.";
}

// Set custom error handler
set_error_handler("customErrorHandler");