"Exception Handling in PHP" full ""

PHP's exception handling mechanism is very similar to Java, but there is no finally, but also can customize the top-level exception handler, after catching the exception information, will jump out of the try-catch block, if there is no jump in the catch action, will continue to execute the next statement.

Simple Exception Capture:

1<?PHP2     functionAddUser ($name)3     {4         if($name= = "Zheng")5         {6             Echo"Added successfully! <br/> ";7         }8         Else9         {Ten             Throw New Exception("Add failed! <br/> "); One         } A     } -  -     functionUpdateUser ($name) the     { -         if($name= = "Song") -         { -             Echo"The update is successful!" <br/> "; +         } -         Else +         { A             Throw New Exception("Update failed!") <br/> "); at         } -     } -     Try -{UpdateUser ("xx"); -AddUser ("Zheng"); -          in     } -     Catch(Exception $e) to     { +         Echo"Caught the exception information!&nbsp;".$e-getMessage (); -     } the     EchoHello; *?>

View Code

By inheriting the exception class, you can customize the exception class, implement custom exceptions, and catch different types of exceptions to implement different processing mechanisms.

1<?PHP2 //This program can be implemented to catch different exceptions! 3 classException1extends Exception4 {5 6 }7 classException2extends Exception 8 {9 Ten } One  A //$x =1; - $x=2; - Try the { -     if($x==1) -     { -         Throw NewException1 ("Exception information 1"); +     } -     Else +     { A         Throw NewException2 ("Exception information 2"); at     } - } - Catch(Exception1$e 1) - { -     Echo"Captured".$e 1->getmessage (). "!"; - } in Catch(Exception2$e 2) - { to     Echo"Captured".$e 2->getmessage (). "!"; + } -?>

View Code

The Set_exception_handler method allows you to customize the system's default exception handler, which we can think of as the top-level exception handler, which is automatically called when an exception occurs.

1<?PHP2 functionMyException ($e)3 {4     Echo"This is the top-level exception handler!" The exception handler that handles exceptions by default when no capture is in progress! <br/> exception information is: ".$e-getMessage ();5 }6 Set_exception_handler("MyException");7 8 Throw New Exception("There was a program exception!") ");9?>

View Code

Finally, there is a bug in PHP's exception handling mechanism (PHP5.3.5):

In the following case PHP will not catch the exception, but the direct error.

1<?PHP2 //PHP two classic bugs3 Try4 {5     $a=8/0;6 }7 Catch(Exception $e)8 {9     Echo"Exception message capture succeeded!" <br/> ";Ten } One  A Try - { -     $file=fopen("Xxx.txt", "r+"); the } - Catch(Exception $e) - { -     Echo"Exception message capture succeeded!" <br/> "; + } -  +?>

View Code

"Exception Handling in PHP" full ""