PHP exception Handling method instance Rollup _php tips

This article describes the PHP exception handling method. Share to everyone for your reference. Specifically as follows:

<?php 
$path = "D://in.txt"; 
Try//Detect exception 
{ 
  file_open ($path); 
} 
catch (Exception $e)//catch exception 
{ 
  echo $e->getmessage (); 
} 
 
function File_open ($path) 
{if 
  (!file_exists ($path))
  //If file cannot be found, throw exception object 
  { 
    throw new Exception ("File not Found", 1); 
  } 
  if (!fopen ($path, "R"))
  //If the file cannot be opened, throw the exception object 
  { 
    throw new Exception ("File Cannot open", 2); 
  } 
? > 

<?php 
$path = "D://in.txt";
The path where the file is located 
file_open ($path);
Call File_open function 
 
File_open ($path) 
{ 
  if (!file_exists)
  ///If file cannot be found, throw exception object 
  { 
    throw new Exception ("File cannot be found", 1); 
  } 
  if (!fopen ($path, "R"))
  //If the file cannot be opened, throw the exception object 
  { 
    throw new Exception ("File Cannot open", 2); 
  } 
? > 

 <?php function Exception_handler ($e)//The exception that is used to handle the exception {echo is not caught: ". $e->getmessag 
E ();
} set_exception_handler ("Exception_handler"); 
Set the exception handling function try//detect exception {$path = "d://in.txt"; 
The catch (Exception $e)//catch Exception {echo $e->getmessage (); } file_open ($path); Call function Open File function File_open ($path) {if (!file_exists ($path))//If file cannot be found, throw exception object {throw new Exception ("file None 
  Method found ", 1); 
  } if (!fopen ($path, "R"))//If the file cannot be opened, throw the exception object {throw new Exception ("File Cannot open", 2); }}?> 

 <?php $path = "D://in.txt"; try {file_open ($path);//attempt to open file} catch (Exception $e) {echo exception information:. $e->getmessage (). "
  /n "; Returns the user-defined exception information echo "Exception code:". $e->getcode ().
  /n "; Returns the user-defined exception code echo "FileName:". $e->getfile (). "
  /n "; Returns the name of the PHP program file where the exception occurred. Echo "The line with exception code". $e->getline ().
  /n "; 
  Returns the line number of the line where the exception occurred, echo "Routing:";
  Print_r ($e->gettrace ());
  Returns an array of trace exceptions every step of the route that is passed Echo $e->gettraceasstring ();  Returns the Gettrace function information formatted as a string {File_open ($path) {if (!file_exists)//If the file does not exist, throw an error {throw new 
  Exception ("File cannot be found", 1); 
  } if (!fopen ($path, "R")) {throw new Exception ("File Cannot open", 2); }}?> 

<?php class Fileexistsexception extends exception{}//classes for handling files that do not have an exception fileopenexception extends exception{}//For 
Class $path for processing file unreadable exceptions = "d://in.txt"; 
try {file_open ($path); The catch (fileexistsexception $e)///If a Fileexistsexception exception is generated prompts the user to confirm that the file location {Echo program has an exception during Operation: ". $e->getmessage ()." 
  /n "; echo "Please confirm the file location. 
"; The catch (fileopenexception $e)///If a Fileopenexception exception is generated prompts the user to confirm the readability of the file {echo "program has an exception during run:". $e->getmessage (). " 
  /n "; echo "Please confirm the readability of the file. 
"; 
  catch (Exception $e) {echo "[unknown exception]"; echo "Exception information:". $e->getmessage (). "
  /n "; Returns the user-defined exception information echo "Exception code:". $e->getcode ().
  /n "; Returns the user-defined exception code echo "FileName:". $e->getfile (). "
  /n "; Returns the name of the PHP program file where the exception occurred. Echo "The line with exception code". $e->getline ().
  /n "; 
  Returns the line number of the line where the exception occurred, echo "Routing:";
  Print_r ($e->gettrace ());
  Returns an array of trace exceptions every step of the route that is passed Echo $e->gettraceasstring (); Returns the Gettrace function information formatted as a string {File_open ($path) {if!file_exists ($path)) {throw new Fileexistsexcepti On ("File cannot be found", 1);
    Throw Fileexistsexception Exception Object} if (!fopen ($path, "R")) {throw new Fileopenexception ("File Cannot open", 2); 

 Throw fileopenexception exception Object}}?>

<?php class Fileexistsexception extends exception{}//classes for handling files that do not have an exception fileopenexception extends exception{}//For 
Class $path for processing file unreadable exceptions = "d://in.txt"; 
  try {file_open ($path);//attempt to open file} catch (Exception $e) {echo [unknown exception]; echo "Exception information:". $e->getmessage (). "
  /n "; Returns the user-defined exception information echo "Exception code:". $e->getcode ().
  /n "; Returns the user-defined exception code echo "FileName:". $e->getfile (). "
  /n "; Returns the name of the PHP program file where the exception occurred. Echo "The line with exception code". $e->getline ().
  /n "; 
  Returns the line number of the line where the exception occurred, echo "Routing:";
  Print_r ($e->gettrace ());
  Returns an array of trace exceptions every step of the route that is passed Echo $e->gettraceasstring (); Returns the Gettrace function information formatted as a string (fileexistsexception $e)//If a fileexistsexception exception is generated, prompts the user to confirm that the file location {echo "program has changed during the run Often: ". $e->getmessage ()." 
  /n "; echo "Please confirm the file location. 
"; The catch (fileopenexception $e)///If a Fileopenexception exception is generated prompts the user to confirm the readability of the file {echo "program has an exception during run:". $e->getmessage (). " 
  /n "; echo "Please confirm the readability of the file. 
"; The function File_open ($path) {if (!file_exists ($path))//If the file does not exist, output error {throw newFileexistsexception ("File cannot be found", 1); 
  } if (!fopen ($path, "R")) {throw new Fileopenexception ("File Cannot open", 2); 

 }}?>

<?php class Fileexistsexception extends exception{}//classes for handling files that do not have an exception fileopenexception extends exception{}//For 
Class $path for processing file unreadable exceptions = "d://in.txt"; 
try {file_open ($path); The catch (fileexistsexception $e)///If a Fileexistsexception exception is generated prompts the user to confirm that the file location {Echo program has an exception during Operation: ". $e->getmessage ()." 
  /n "; echo "Please confirm the file location. 
"; The catch (fileopenexception $e)///If a Fileopenexception exception is generated prompts the user to confirm the readability of the file {echo "program has an exception during run:". $e->getmessage (). " 
  /n "; echo "Please confirm the readability of the file. 
"; 
  catch (Exception $e) {echo "[unknown exception]"; echo "Exception information:". $e->getmessage (). "
  /n "; Returns the user-defined exception information echo "Exception code:". $e->getcode ().
  /n "; Returns the user-defined exception code echo "FileName:". $e->getfile (). "
  /n "; Returns the name of the PHP program file where the exception occurred. Echo "The line with exception code". $e->getline ().
  /n "; 
  Returns the line number of the line where the exception occurred, echo "Routing:";
  Print_r ($e->gettrace ());
  Returns an array of trace exceptions every step of the route that is passed Echo $e->gettraceasstring ();  Returns the Gettrace function information formatted as a string File_open ($path) {try {if (!file_exists ($path)) {throw new FileExistSexception ("File cannot be found", 1); 
    } if (!fopen ($path, "R")) {throw new Fileopenexception ("File Cannot open", 2); 
    The catch (Exception $e)//catch exception {echo File_open function is abnormal during run;                  Throw $e;

 Throw exception}}?>

I hope this article will help you with your PHP programming.