How to Handle errors in PHP?

Handling errors in PHP involves various techniques and constructs to detect, report, and manage errors or exceptions that occur during script execution.

Error Reporting Level:

Controls the level of error messages displayed or logged in PHP scripts.

// Set the error reporting level to display all errors
error_reporting(E_ALL);

// Example code that may generate errors
echo $undefinedVariable; // Example of accessing an undefined variable

Error Logging:

Logs error messages to a specified file, facilitating debugging and troubleshooting.

error_log("Error message", 3, "/path/to/error.log");

The try-catch Blocks (Exceptions):

Allows you to handle exceptions gracefully by enclosing code that may throw exceptions within a try block and provide error-handling logic in catch blocks.

try {
    // Code that may throw an exception
} catch (Exception $e) {
    // Handle the exception
}

Custom Error Handlers:

Enables the definition of custom functions to handle PHP errors or exceptions, providing more control over error-handling behavior.

function customErrorHandler($errno, $errstr, $errfile, $errline) {
    // Custom error handling logic
}

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