PHP Error and exception handling

Throw and catch an exception, example:

 
  Exception ("A terrible error has occurred", 42);} catch (Exception $e) {    echo "Exception ". $e->getcode (). ":". $e->getmessage (). "
"." In ". $e->getfile (). $e->getline ()."
";}

Exception Handling ">
Built-in methods for the Exception class:

GetCode ()--Returns the code passed to the constructor;

GetMessage ()--Returns the message passed to the paparazzi function;

GetFile ()--Returns the full path of the code file that generated the exception;

GetLine ()--Returns the code line number of the code file that generated the exception;

gettrance--returns an array containing the code fallback path that generated the exception;

gettranceasstring--returns a message with the same direction as the Gettrance (), which will be formatted with a string;

__tostring ()--allows a simple display of a Exception object and gives the information that all of the above methods can provide.

Examples of user-defined exceptions:

 
  Exception {    function __tostring () {        return "Exception ". $this->getcode (). ":". $this->getmessage ().
"." In ". $this->getfile (). $this->getline ()."
";    }} try{    throw new MyException("A terrible error has occurred", 42);} catch (myException $m) {    echo $m;}

You first need to create a file for the exception class: File_Exception. php

 
  Exception {    function __tostring () {        return "FileOpenException ". $this->getcode (). ":". $this GetMessage (). "
"." In ". $this->getfile (). $this->getline ()."
";    }} Custom cannot write exception class FileWriteExceptionException{    function __tostring () {        return "FileWrite Exception ". $this->getcode ().": ". $this->getmessage ()."
"." In ". $this->getfile (). $this->getline ()."
";    }} Custom cannot get write lock exception class FilelockExceptionException{    function __tostring () {        return ' FilelockException ". $this->getcode ().": ". $this->getmessage ()."
"." In ". $this->getfile (). $this->getline ()."
";    }}

require_once ("File_Exception. php");

Set the file output content and format    $out _put_string= $date. \ t ". $cloths." piece mens \ t ". $shoes." Two Shoes \ t ". $glasses." Pair of glasses \t\ Total Price: ￥ ". $total _amount." Delivery address: \ t ". $address." \ n ";    exception handling    try{        //Open file, (Append mode + binary mode)        if (! ( $fp = @fopen ("$DOCUMENT _root/l02/files/orders.txt", ' AB ')))            throw new FileOpenException();        Write Operation Lock        if (!flock ($FP, LOCK_EX))            throw new FilelockException();        Writes data to the file        if (!fwrite ($fp, $out _put_string,strlen ($out _put_string))            throw new FileWriteException ();        Release existing lock        flock ($fp, lock_un);        Close file stream        fclose ($fp);        echo "
Data Save complete
";    } catch (FileOpenException $foe) {        echo "
File open failed, please check the server is abnormal!
";        Exit;    } catch (Exception $e) {        echo '
Your order has not been submitted for completion, please try again.
";        Exit;    }

The above describes the PHP error and exception handling, including the aspects of the content, I hope that the PHP tutorial interested in a friend helpful.