PHP Exception Handling

one, exception Handling--can effectively control multiple errors or exceptions in the code

• The basic syntax is as follows:

Try {  // code for possible exception } Catch (Exception$e) {  // for exception handling//1, self-processing//2, no processing, continue to throw }

Exception is a PHP built-in exception handling class

　　　　

• Example

<?PHPfunctionAddUser ($name){        if($name= = "abc"){            Echo"added successfully! "; }Else{            //Throw Exception            Throw New Exception("add failed! "); }    }    functionUpdateUser ($name){        if($name= = "abc"){            Echo"modified successfully!" "; }Else{            //Throw Exception            Throw New Exception("modification Failed!") "); }    }    Try{addUser ("abc"); UpdateUser ("Ben."); }    //Catching exceptions    Catch(Exception $e){        Echo"failure message:".$e-GetMessage ();
Throw $e; can also continue to be thrown after capture}?>

The results of the operation are as Follows:

second, top-level exception Handling--catch exceptions that are not caught

• The basic usage is as follows:

<? PHP      function myexception ($exception) {             echo "exception information:".  $exception-getMessage ();     }      Set_exception_handler ("myexception");      Throw New Exception ("no catch exception");? >

• Example

1<?PHP2     //customizing a top-level exception handling function3     functionMyException ($exception){4         Echo"exception information:".$exception-getMessage ();5     }6     //to modify the default top-level exception handling function (device)7     Set_exception_handler("myexception");8 9     functionA$age){Ten         if($age>100) one             Throw New Exception("too Old!") "); a     } -  -A (120);  the?>

Results:

third, Summary: If an exception is thrown, it must be captured or handled with the top-level exception handler.

　　　　

PHP Exception Handling