An in-depth understanding of PHP error and logging functions _php example

The

PHP error and logging introduction
error and logging functions allow you to process and record errors. The
error function allows the user to define error-handling rules and modify how the error is logged. The
logging function allows users to log applications and send log messages to e-mail, system logs, or other machines. The

Install
error and logging functions are part of the core of PHP. These functions can be used without installation.
PHP Error and Logging functions

PHP: Indicates the earliest version of PHP that supports this function.
function   Description  php
Debug_backtrace ()   build BackTrace.  4
Debug_print_backtrace ()   output backtrace.  5
Error_get_last ()   Get the last error.  5
Error_log ()   sends an error to a server error record, file, or remote destination.  4
error_reporting ()   Specify which error to report.  4
Restore_error_handler ()   error handlers before recovery.  4
Restore_exception_handler ()   The exception handler before the restore.  5
Set_error_handler ()   Set user-defined error-handling functions.  4
Set_exception_handler ()   Set user-defined exception handling functions.  5
Trigger_error ()   Create user-customized error messages.  4 the alias of the
User_error ()  trigger_error ().  4
PHP Error and Logging constants

PHP: Indicates the earliest version of PHP that supports this constant.
Value   Constants   Description  php
1  e_error   fatal run-time error. The error cannot be recovered. Execution of the script was interrupted.  
2  e_warning   non-fatal run-time error. Script execution is not interrupted.  
4  e_parse   Compile-time syntax parsing error. Parsing errors should only be generated by the parser.  
8  e_notice   run-time prompts. May be an error, or it may occur while the script is running normally.  
 e_core_error   errors generated internally by PHP.  4
 e_core_warning   warnings generated internally by PHP.  4
 e_compile_error   Errors generated internally by the Zend script engine.  4
128  e_compile_warning   A warning generated internally by the Zend scripting engine.  4
256  e_user_error   A run-time error generated by invoking the Trigger_error () function.  4
 e_user_warning   A run-time warning generated by invoking the Trigger_error () function.  4
1024  e_user_notice   A run-time hint generated by invoking the Trigger_error () function.  4
2048  e_strict   run-time prompts. Useful for enhancing the interoperability and compatibility of your code.  5
4096  e_recoverable_error   Fatal error that can be caught. (see Set_error_handler ())  5
8191  e_all   All errors and warnings except E_strict.  5