PHP Basic Tutorial Common PHP error types and Shielding methods

As long as the program is running, there will inevitably be errors, errors are common, such as error,notice,warning and so on. This article brother even PHP training

Small series to tell you specifically about PHP error types and shielding methods. In

Php
, there are mainly the following 3 types of errors.

1. Note (notices)

These are small and not serious errors, such as accessing a variable that is not defined. Typically, this type of error is not prompted to the user, but sometimes these errors can affect the result of the run.

2. Warning (Warnings)

This is a slightly more serious mistake, such as wanting to include an include () file that does not exist itself. Such an error message will prompt the user, but will not cause the program to stop running.

3. Fatal error (Fatal errors)

These are serious errors, such as if you want to initialize an object that does not exist at all, or call a nonexistent function that causes the program to stop running, and PHP will show the error to the user.

Different types of errors include:

E_error: It is usually displayed, and the program execution is interrupted.

E_warning: It is usually displayed but does not interrupt the execution of the program.

E_notice: A code error occurred while the script was running correctly.

E_parse: Syntax parsing error.

E_core_error: A fatal error occurred while PHP was booting.

E_core_warning: Reports non-fatal errors that occur when PHP is started.

E_compile_error: A fatal error occurred at compile time, indicating a script error.

E_user_error: User-generated error message.

E_user_warning: User-generated warning message.

E_user_notice: User-raised note message.

E_strict: Encoding Normalization warning, run-time error.

E_recoverable_error: Near-fatal run-time errors, if not captured, are treated as e_error.

E_all: Captures all errors and warnings.

Block PHP Error hints

Method One: Add @ before a function that is likely to go wrong, and then or Die ("")

Such as:

@mysql_connect (...) ordie ("Database Connect Error")

Method Two: Edit php.ini, look for "display_errors =" and change the value after "=" to "off."

Method Three: Add error_reporting (0) before the php script to block all error prompts.

Among them, error_reporting configures the level of return for error messages.

Syntax: int error_reporting (Int[level]);

return value: Integer

Function type: PHP system function

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