How can environment variables and error handlers be used to communicate errors to clients in PHP scripts?

Environment variables can be used to set error reporting levels in PHP scripts, allowing developers to control how errors are displayed or logged. Error handlers can be used to customize error messages and responses sent to clients, providing more helpful information about what went wrong in the script. 

// Set error reporting level using environment variable
error_reporting(getenv('ERROR_LEVEL'));

// Custom error handler function
function customErrorHandler($errno, $errstr, $errfile, $errline) {
    // Log the error
    error_log("Error: [$errno] $errstr in $errfile on line $errline");
    
    // Send a custom error message to the client
    http_response_code(500);
    echo "An error occurred. Please try again later.";
}

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

Keywords

environment variables error handlers communication errors clients

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