PHP Exceptions
PHP Exceptions
In PHP, exceptions are a way of handling errors or exceptional situations that occur during the execution of a program. Exceptions allow you to separate the error-handling logic from the regular program flow, making your code more maintainable and easier to debug.
Here’s an example of how to use exceptions in PHP:
function divide($dividend, $divisor) {
if ($divisor == 0) {
throw new Exception("Division by zero.");
}
return $dividend / $divisor;
}
try {
$result = divide(10, 0);
echo $result;
} catch (Exception $e) {
echo "Error: " . $e->getMessage();
}
In this example, we define a function divide() that takes two parameters and performs division between them. If the divisor is 0, we throw an exception with a message “Division by zero.”. We then use a try–catch block to call the divide() function and handle any exceptions that are thrown. If an exception is thrown, we catch it using the catch block, and print an error message to the screen using the getMessage() method of the exception object.
You can also define your own custom exception classes in PHP by extending the built-in Exception class. For example:
class MyException extends Exception {}
function my_function() {
throw new MyException("This is my custom exception.");
}
try {
my_function();
} catch (MyException $e) {
echo "Error: " . $e->getMessage();
}
In this example, we define a custom exception class MyException that extends the built-in Exception class. We then define a function my_function() that throws an instance of MyException with a custom message. We use a try–catch block to call my_function() and catch any instances of MyException that are thrown.
Exceptions are a powerful tool for handling errors and exceptional situations in PHP programming, and using them effectively can help you write more maintainable and robust code.