The throw Command
The throw command is used for explicitly throwing an exception in PHP.
It accepts one parameter - an exception object, which must be an instance of a class
inherited from the base Exception class. When this function is called, the execution of the current
code immediately stops, and PHP attempts to find a corresponding catch block to handle the exception.
Syntax
throw new ExceptionClass(message, code, previous);
Example
A simple example of generating an exception:
<?php
$age = -5;
if ($age < 0) {
throw new Exception('Age cannot be negative');
}
?>
Code execution result:
Fatal error: Uncaught Exception: Age cannot be negative
Example
Example with exception handling:
<?php
try {
$res = 10 / 0;
if (is_infinite($res)) {
throw new Exception('Division by zero');
}
} catch (Exception $e) {
echo 'Error: ' . $e->getMessage();
}
?>
Code execution result:
'Error: Division by zero'
Example
Using a custom exception:
<?php
class MyCustomException extends Exception {}
try {
throw new MyCustomException('Custom error message');
} catch (MyCustomException $e) {
echo 'Custom error caught: ' . $e->getMessage();
}
?>
Code execution result:
'Custom error caught: Custom error message'
