Php Exception Handling Method Instance Summary

Php Exception Handling Method Instance Summary

This article describes how to handle php exceptions. Share it with you for your reference. The details are as follows:

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<? Php $ Path = "D: // in.txt "; Try // detect exceptions { File_open ($ path ); } Catch (Exception $ e) // catch an Exception { Echo $ e-> getMessage (); }   Function file_open ($ path) { If (! File_exists ($ path )) // If the file cannot be found, an exception is thrown. { Throw new Exception ("the file cannot be found", 1 ); } If (! Fopen ($ path, "r ")) // If the file cannot be opened, an exception is thrown. { Throw new Exception ("file cannot be opened", 2 ); } } ?>

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<? Php $ Path = "D: // in.txt "; // File path File_open ($ path ); // Call the file_open Function   Function file_open ($ path) { If (! File_exists ($ path )) // If the file cannot be found, an exception is thrown. { Throw new Exception ("the file cannot be found", 1 ); } If (! Fopen ($ path, "r ")) // If the file cannot be opened, an exception is thrown. { Throw new Exception ("file cannot be opened", 2 ); } } ?>

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<? Php Function exception_handler ($ e) // Functions used to handle exceptions { Echo "uncaptured exceptions:". $ e-> getMessage (); }   Set_exception_handler ("exception_handler "); // Set the exception handling function Try // detect exceptions { $ Path = "D: // in.txt "; } Catch (Exception $ e) // catch an Exception { Echo $ e-> getMessage (); } File_open ($ path); // call a function to open a file Function file_open ($ path) { If (! File_exists ($ path )) // If the file cannot be found, an exception is thrown. { Throw new Exception ("the file cannot be found", 1 ); } If (! Fopen ($ path, "r ")) // If the file cannot be opened, an exception is thrown. { Throw new Exception ("file cannot be opened", 2 ); } } ?>

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<? Php $ Path = "D: // in.txt ";   Try { File_open ($ path); // try to open the file } Catch (Exception $ e) { Echo "exception information:". $ e-> getMessage (). "/n "; // Return user-defined exception information Echo "Exception Code:". $ e-> getCode (). "/n "; // Return the User-Defined Exception Code Echo "file name:". $ e-> getFile (). "/n "; // Return the PHP program file name with an exception Echo "abnormal code row". $ e-> getLine (). "/n "; // Return the row number of the row where the code with an exception is located. Echo "route :"; Print_r ($ e-> getTrace ()); // Return the route passed by each step of the trace exception in the form of an array Echo $ e-> getTraceAsString (); // Returns the getTrace function information formatted as a string. } Function file_open ($ path) { If (! File_exists ($ path )) // If the object does not exist, an error is thrown. { Throw new Exception ("the file cannot be found", 1 ); }   If (! Fopen ($ path, "r ")) { Throw new Exception ("file cannot be opened", 2 ); } } ?>

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<? Php Class FileExistsException extends Exception {} // Class used to handle non-abnormal File Class FileOpenException extends Exception {} // Class used to handle unreadable file exceptions $ Path = "D: // in.txt "; Try { File_open ($ path ); } Catch (FileExistsException $ e) // If a FileExistsException exception occurs, the system prompts the user to confirm the file location. { Echo "An exception occurred when the program was running:". $ e-> getMessage (). "/n "; Echo "Please confirm the file location. "; } Catch (FileOpenException $ e) // If a FileOpenException occurs, the system prompts the user to check the readability of the file. { Echo "An exception occurred when the program was running:". $ e-> getMessage (). "/n "; Echo "Make sure the file is readable. "; } Catch (Exception $ e) { Echo "[unknown exception]"; Echo "exception information:". $ e-> getMessage (). "/n "; // Return user-defined exception information Echo "Exception Code:". $ e-> getCode (). "/n "; // Return the User-Defined Exception Code Echo "file name:". $ e-> getFile (). "/n "; // Return the PHP program file name with an exception Echo "abnormal code row". $ e-> getLine (). "/n "; // Return the row number of the row where the code with an exception is located. Echo "route :"; Print_r ($ e-> getTrace ()); // Return the route passed by each step of the trace exception in the form of an array Echo $ e-> getTraceAsString (); // Returns the getTrace function information formatted as a string. } Function file_open ($ path) { If (! File_exists ($ path )) { Throw new FileExistsException ("file cannot be found", 1 ); // Throw a FileExistsException exception object }   If (! Fopen ($ path, "r ")) { Throw new FileOpenException ("file cannot be opened", 2 ); // Throw a FileOpenException object   } } ?>

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<? Php Class FileExistsException extends Exception {} // Class used to handle non-abnormal File Class FileOpenException extends Exception {} // Class used to handle unreadable file exceptions $ Path = "D: // in.txt "; Try { File_open ($ path); // try to open the file } Catch (Exception $ e) { Echo "[unknown exception]"; Echo "exception information:". $ e-> getMessage (). "/n "; // Return user-defined exception information Echo "Exception Code:". $ e-> getCode (). "/n "; // Return the User-Defined Exception Code Echo "file name:". $ e-> getFile (). "/n "; // Return the PHP program file name with an exception Echo "abnormal code row". $ e-> getLine (). "/n "; // Return the row number of the row where the code with an exception is located. Echo "route :"; Print_r ($ e-> getTrace ()); // Return the route passed by each step of the trace exception in the form of an array Echo $ e-> getTraceAsString (); // Returns the getTrace function information formatted as a string. } Catch (FileExistsException $ e) // If a FileExistsException exception occurs, the system prompts the user to confirm the file location. { Echo "An exception occurred when the program was running:". $ e-> getMessage (). "/n "; Echo "Please confirm the file location. "; } Catch (FileOpenException $ e) // If a FileOpenException occurs, the system prompts the user to check the readability of the file. { Echo "An exception occurred when the program was running:". $ e-> getMessage (). "/n "; Echo "Make sure the file is readable. "; } Function file_open ($ path) { If (! File_exists ($ path )) // If the file does not exist, the output is incorrect. { Throw new FileExistsException ("file cannot be found", 1 ); }   If (! Fopen ($ path, "r ")) { Throw new FileOpenException ("file cannot be opened", 2 ); } } ?>

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<? Php Class FileExistsException extends Exception {} // Class used to handle non-abnormal File Class FileOpenException extends Exception {} // Class used to handle unreadable file exceptions $ Path = "D: // in.txt "; Try { File_open ($ path ); } Catch (FileExistsException $ e) // If a FileExistsException exception occurs, the system prompts the user to confirm the file location. { Echo "An exception occurred when the program was running:". $ e-> getMessage (). "/n "; Echo "Please confirm the file location. "; } Catch (FileOpenException $ e) // If a FileOpenException occurs, the system prompts the user to check the readability of the file. { Echo "An exception occurred when the program was running:". $ e-> getMessage (). "/n "; Echo "Make sure the file is readable. "; } Catch (Exception $ e) { Echo "[unknown exception]"; Echo "exception information:". $ e-> getMessage (). "/n "; // Return user-defined exception information Echo "Exception Code:". $ e-> getCode (). "/n "; // Return the User-Defined Exception Code Echo "file name:". $ e-> getFile (). "/n "; // Return the PHP program file name with an exception Echo "abnormal code row". $ e-> getLine (). "/n "; // Return the row number of the row where the code with an exception is located. Echo "route :"; Print_r ($ e-> getTrace ()); // Return the route passed by each step of the trace exception in the form of an array Echo $ e-> getTraceAsString (); // Returns the getTrace function information formatted as a string. } Function 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 be opened", 2 ); } } Catch (Exception $ e) // catch an Exception { Echo "The file_open function encountered an exception while running "; Throw $ e; // throwing an exception } } ?>

I hope this article will help you with php programming.