Exception Handling of PHP

1<?PHP2 /*3 Exception4 5 */6 //error_reporting (0);7 class Mysql {8     protected $conn;9      Public function__construct () {Ten         $this->conn = @mysql_connect(' localhost ', ' root ', ' 13456 ');//@ is an error suppressor and does not report an error One         if(!$this-conn) { A             //Satellite Reports - //In PHP, a satellite is a defined object - ///What Class of object: Exception class object the //new Exception (' Error reason ', error code) -             $e=New Exception(' Leaking oil ', 5); -             Throw $e;//Throw throw /throw out -         } +     } - } + Try{//Test and try to capture the error message A     $mysql=New Mysql();//returns the MySQL object and automatically connects to the database at      -  -}Catch(Exception $e) { -     Echo $e, ' <br/> '; -     Echo' Capture to error message <br/> '; -     Echo' Error message: ',$e->getmessage (), ' <br/> '; in     Echo' Error code: ',$e->getcode (), ' <br/> '; -     Echo' Error file: ',$e->getfile (), ' <br/> '; to     Echo' ERROR line: ',$e->getline (), ' <br/> '; + } -  the /* * Q: How can I tell if I have successfully connected to the database?  $ Answer: After returning an object, print the object's $conn property to determinePanax Notoginseng  - 2 Steps Required the 1:new Mysql + 2:if ($mysql->conn) { A } the think: When we used a function, we all returned a value, using the value to judge a variety of situations + For example, returning True/false represents success/Failure - Can we use the return value now?  $  $ */ - Var_dump($mysql);//NULL if the database connection failed - if($mysqlinstanceofMysql) { the     Echo' Create object successfully, probably connected successfully '; -}Else {Wuyi     Echo' Failed to create object, probably connection failed '; the } -?>

Exception Handling of PHP