Core Function Throw
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=== Remarks === | === Remarks === | ||
| + | |||
| + | Unlike a normal function throw uses use parentheses example: | ||
| + | <pre> | ||
| + | // This is CORRECT | ||
| + | throw new Exception("My error"); | ||
| + | </pre> | ||
| + | |||
| + | <pre> | ||
| + | // This is WRONG | ||
| + | // It will work and its cute but its WRONG | ||
| + | throw(new Exception("My error")); | ||
| + | </pre> | ||
The object should be an Exception class or something that inherits from the Exception class. | The object should be an Exception class or something that inherits from the Exception class. | ||
Revision as of 04:19, 23 January 2013
Throw <expression>;
Contents |
Description
Throw an exception causing the program to end (Unless the exception is captured in a TRY statement see example).
expression
An object to send when the exception was thrown.
Return Value
None.
Remarks
Unlike a normal function throw uses use parentheses example:
// This is CORRECT
throw new Exception("My error");
// This is WRONG
// It will work and its cute but its WRONG
throw(new Exception("My error"));
The object should be an Exception class or something that inherits from the Exception class.
Example
Example of using an exception
Try { println("This code always executes"); // None of the exceptions params are required // but it helps to at least have a message (First param) // The second param is the error code can be anything you want // The third param is the PARENT inside a class you would use // the $this variable as the parent for obvious reasons throw new Exception("My Message", 777, $parent); println("This code below the exception will not be executed if there was an exception"); } Catch ( Exception $e ) { println("This code only gets executed if an exception happened"); println("Message: " . $e->getMessage()); // Gets the default or new message println("Code: " . $e->getCode()); // Gets the error code if one exists println("Parent: " . $e->getParent()); // Gets the parent if one exists } Finally { println("This code gets executed regardless if there was an exception or not"); }
Example of creating your own Exception class
Class myException extends Exception { my $myParam; Function __Construct($Message, $Code, $myParam, $Parent) { $this->$myParam = $myParam; parent::__construct($Message, $Code, $Parent); // Call the parent (Exception) class } Function myParam() { return $this->$myParam; } }; Try { println("This code always executes"); // None of the exceptions params are required // but it helps to at least have a message (First param) // The second param is the error code can be anything you want // The third param is the PARENT inside a class you would use // the $this variable as the parent for obvious reasons throw new myException("My Message", 777, "my special param", $parent); println("This code below the exception will not be executed if there was an exception"); } Catch ( myException $e ) { println("This code only gets executed if an exception happened"); println("Message: " . $e->getMessage()); // Gets the default or new message println("Code: " . $e->getCode()); // Gets the error code if one exists println("MyParam: " . $e->myParam()); // Gets our new param that was extended to exception println("Parent: " . $e->getParent()); // Gets the parent if one exists } Finally { println("This code gets executed regardless if there was an exception or not"); }
