PHP - Creating custom exception


The following code extends Exception to create custom exception.

     use Exception; 

     class InvalidIdException extends Exception { 
        public function __construct($message = null) { 
            $message = $message ?: 'Invalid id provided.'; 

The InvalidIdException class extends from the class Exception.

The constructor of the class takes an optional argument, $message.

The ?: operator is a shorter version of a conditional.

parent::__construct will invoke the parent's constructor.

We can use this new exception.

throw new InvalidIdException('Id cannot be a negative number.'); 

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