Exception handling in php is used to modify the normal flow of code execution if a specified error occurs. When an exception is given , the following code will not be executed, and PHP will try to find the appropriate “catch” block. If an exception is not caught, a fatal error will be displayed.
Keywords in Exception Handling:
- try : This is a block of code where an exception may occur.
- catch: It represent block of code that will be executed when a particular exception has been thrown.
- throw: It is used to throw an exception. It is also used to list the exceptions that a function throws, but doesn’t handle itself. Each “throw” must have at least one “catch”.
- finally: It is used in place of catch block or after catch block basically it is put for cleanup activity in PHP code.
Example :
<?php
function checkMarkStatus($mark) {
if($mark>=5) {
throw new Exception("The Student is Pass.");
}
return true;
}
try {
checkMarkStatus(5);
echo 'The Student is Fail';
}
catch(Exception $e) {
echo $e->getMessage();
}
?>
Advantages of Exception Handling :
- Sometimes error handling is very difficult for the developer to understand in normal coding. With try catch block it is more readable and understandable.
- Exceptions allow you to distinguish between different types of errors, and is also great for routing.
- The thrown exception can then be handled by a custom error handler.
