php Exception handling resolves this

PHP is scheduled for two exception classes: Exception and Errorexception

Exception {    /*Properties*/    protected string $message;//Exception message Content    protectedInt$code;//Exception code number    protected string $file;//the file name that throws the exception    protectedInt$line;//throws the line number of the exception in the file    /*Method*/     Public__construct ([string $message= "" [, int$code= 0 [,Exception $previous=NULL]]] )    Final  Public stringGetMessage (void)//exception-Thrown information    Final  Public ExceptionGetPrevious (void)//Previous Exception    Final  Publicint GetCode (void)//The exception code, which is user-defined    Final  Public stringGetFile (void)//the file that happened to the exception path strength    Final  Publicint getLine (void)//the row where the exception occurred    Final  Public ArrayGettrace (void)//Exception tracking Information (array)    Final  Public stringGettraceasstring (void)//Exception tracking information (string)     Public string__tostring (void)//call the return value of a child function when attempting to use the exception object as a string directly    Final Privatevoid __clone (void)//called when cloning an exception object}

Errorexceptionextends Exception  {     /*Properties*/    protectedInt$severity   ; /*Method*/         Public__construct ([string $message= "" [, int$code= 0 [, int$severity= 1 [,string $filename=__file__[, int$lineno=__line__[,Exception  $previous=NULL    ]]]]]] )    Final  Publicint getseverity (void)/*Methods of Inheritance*/    Final  Public string Exception::getMessage (void)Final  Public Exception Exception::getprevious (void)Final  PublicIntException::getcode (void)Final  Public string Exception::getFile (void)Final  PublicIntException::getLine (void)Final  Public Array Exception::gettrace (void)Final  Public string Exception::gettraceasstring (void) Public string Exception::__tostring (void)Final PrivatevoidException::__clone (void)}

So how do I catch an exception?
(1) PHP available try...catch ... To catch an exception, the code for exception handling must be inside a try code block.

Try {    thrownewException(' Exception Test 1 ', 1001catch(  Exception$e) {    echo$e->getmessage (). ' -‘. $e-GetCode ();}

(2) The user can customize the exception handling function [Set_exception_handler], which is used for exceptions caught with Try/catch.

function  $e     {echo  "uncaught exception:"  ,  $e , GetMessage (),  "\ n" /c11>set_exception_handler (' Exception_handler 'thrownew   Exception (' uncaught Exception 'echo "This line will not be executed";

You can see that the exception is handled using the Ser_exception_handler callback function, and subsequent code does not continue, but Try-catch can.
(3) PHP can catch different types of exceptions with multiple catch and allow the exception to be thrown again within the catch code block.

// please according to the actual extended exception class Beijing kiddy| Hebei PVC Plastic Flooring

classMyExceptionextends Exception {     Public function__construct ($message= ",$code= 0) {     }      Public functionmyFunction () {Echo' Just for test '; }} Try {    Throw NewMyException (' An error ');} Catch(myexception$e) {    Echo $e-myFunction ();} Catch(Exception $e) {    Echo $e-getMessage ();}

(4) PHP5.5 has supported the FINALLY keyword, you do not have to worry about whether the exception overflow.

Can be compared as follows:

functiondosomething () {$resource=Createresource (); Try {        $result= Useresource ($resource); } Catch(Exception $e) {Releaseresource ($resource); Log($e-getMessage ()); Exit(); } releaseresource ($resource); return $result;} //after using finallyfunctiondoSomething2 () {$resource=Createresource (); Try {        $result= Useresource ($resource); return $result; } Catch(Exception $e) {        Log($e-getMessage ()); Exit(); } finally {Releaseresource ($resource); }}

php Exception handling resolves this