In PHP, an exception can be seen as discontinuation in the normal flow of program execution. An exception can also be seen as an error that causes a complete disruption in the code execution flow.
Exception handling is making the program respond appropriately when an error occurs. If an error occurs, the program should respond with the actual cause of the error and possibly where the error occurred. We achieve this functionality using the try-catch exception handler.
(try(//protected code)(catch Exception e1 (//catch block)))
The try-catch checks for errors in a code (protected code) and output specific error messages (catch block) when an error arises in the code block.
<?php//create function with an exceptionfunction verify($digit) {if($digit>1) {throw new Exception("Parameter should be less than 1");}return true;}//check for exceptiontry {verify(2);//this text will display if there is no exceptionecho 'You passed a value lower than 1';}//catch exceptioncatch(Exception $e) {echo 'Message: ' .$e->getMessage();}?>
throw to define a new Exception when the number passed into the verify function is greater than 1.try block.verify function and pass 2 as a parameter.echo message if the function runs successfully if the function throw an exception the message won't display, instead the catch block will catch this exception and output the defined exception created in line 5.catch the exception and display the message defined in the throw in line 5.