PHP error handling and implementation-CSDN blog

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1.php error, warning, how exception handling is implemented, those functions are used to handle the corresponding error

PHP exception hints are divided into three categories Error/warning/notice
Error Supplement:
Fatal Error: Fatal errors (script termination run)
E_error//Fatal run error, error unrecoverable, pause execution script
Fatal error during initialization of E_core_error//php Startup
E_compile_error//compile-time fatal error, just like a e_error generated by the Zend scripting engine
E_user_error//Custom error message. Like with PHP function Trigger_error (Error type set to: E_user_error)
E_recoverable_error//Fatal error that can be captured. It indicates that a potentially very dangerous error has occurred, but has not yet caused the PHP engine to be in an unstable state.
Parse Error: Parsing errors at compile time, syntax error (script terminating run)
E_parse//compile-time syntax parsing error
Warning Supplement: Warning Error (only informational, script not terminating)
E_warning//Run-time warning (non-fatal error).
e_core_warning//PHP initialization warning (non-fatal error) occurred during startup.
e_compile_warning//Compile warning
E_user_warning//user-generated warning message
Exception notification supplement: Notification error (only give notification information, script does not terminate running)
E_notice//run-time notifications. Indicates that the script encountered a situation that might appear to be an error.
E_user_notice//user-generated notification information.




PHP Error Handling implementations:
Register_shutdown_function (' funcName ')//parameter is the name of the function that needs to catch the error, but register_shutdown_function can only catch a fatal error at run time and cannot capture execution error when interpreting Because it is executed after the execution of the program (such as a syntax error, which is not captured when the runtime generates an error)
The Set_error_handler (' funcName ')//parameter is the function name of the callback that needs to be captured, and differs from Register_shutdown_function, which is an error that is caught while the function is running


When the target file execution encounters an error, the system will callback the specified function:
Example:

<?phpregister_shutdown_function ("Fatal_handler"), Set_error_handler ("Error_Handler");d efine (' E_FATAL ',  E _error | E_user_error |  E_core_error |         E_compile_error | e_recoverable_error| E_parse);  Get fatal errorfunction Fatal_handler () {    $error = Error_get_last ();    if ($error && ($error ["Type"]=== ($error ["type"] & E_fatal)) {        $errno   = $error ["type"];//        $ Errfile = $error ["file"];        $errline = $error ["line"];        $errstr  = $error ["message"];        Error_Handler ($errno, $errstr, $errfile, $errline);}  } Get all Errorfunction Error_Handler ($errno, $errstr, $errfile, $errline) {    $str =<<<eof         "errno": $ errno "         errstr": $errstr         "errfile": $errfile         "errline": $errlineEOF;//Get to the error can be handled by themselves, such as log, alarm and so on    echo $str;} Error_get_last () captures the execution error result//error_clear_last () clears the last error message generated//above both can catch all errors, warnings, exceptions, but for performance reasons, it is not recommended to use its catch warning exception

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