Detailed explanation of php error types and shielding methods

We writeAs long as the program is running, errors will inevitably occur. Errors are very common, such as Error, Notice, Warning, etc. In PHP, there are mainly the following three types of errors.

1. Notices

These are relatively small and not serious errors, such as accessing an unused defined variables. Usually, such errors are not prompted to the user, but sometimes these errors will affect the results of the operation.

2. Warnings

This is a slightly more serious error, such as wanting to include include ()A file that does not exist. Such error messages will be prompted to the user, but will not cause the program to terminate.

3. Fatal errors

These are serious errors, such as if you want to initialize a class that does not exist at all Object, or calling a function that does not exist. These errors will cause the program to stop running, and PHP will also display these errors to the user.

Different error categories include:

E_ERROR: will usually be displayed, as well Will interrupt program execution.

E_WARNING: will usually be displayed, but will not interrupt program execution.

E_NOTICE: A code error that occurs when the script is running normally.

E_PARSE: Syntax parsing error.

E_CORE_ERROR: A fatal error that occurred during PHP startup.

E_CORE_WARNING: Reports non-fatal errors that occur during PHP startup.

E_COMPILE_ERROR: A fatal error that occurs during compilation, indicating an error in the script.

E_USER_ERROR: Error message generated by the user.

E_USER_WARNING: Warning message generated by the user.

E_USER_NOTICE: The attention message caused by the user.

E_STRICT: Encoding standardization warning, error that occurred at runtime.

E_RECOVERABLE_ERROR: A near-fatal runtime error, if not caught, is treated as E_ERROR.

E_ALL: Catch all errors and warnings.

Shield PHP error prompts

Method 1: Before functions that may cause errors Add @, then or die("") such as:

@mysql_connect(...) or die("Database Connect Error")

Method 2: Edit php.ini, search for "display_errors =" and change the value after "=" to "off.

Method 3: Add error_reporting(0) in front of the php script to block all error prompts.

Among them, error_reporting configures the level of error message reporting. ##

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