PHP error types and shielding methods

PHPError types and shielding methods

As long as the program is running, errors will inevitably occur. Errors are very common, such as Error, Notice, Warning, etc. This article talks specifically about PHP error types and shielding methods. 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 undefined variable. 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 trying to include() a file that does not exist. Such an error message will be prompted to the user, but will not cause the program to terminate.

3. Fatal errors

These are serious errors. For example, if you want to initialize an object of a class that does not exist at all, or call a function that does not exist, these errors will cause the program to stop running, and PHP will also These errors will be displayed to the user.

Different error types include:

E_ERROR: Usually displayed, it can also interrupt program execution.

E_WARNING: Usually 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: Fatal error that occurred during PHP startup.

E_CORE_WARNING: Report non-fatal errors that occur when PHP starts.

E_COMPILE_ERROR: Fatal error that occurs during compilation, indicating errors in the script.

E_USER_ERROR: User-generated error message.

E_USER_WARNING: Warning message generated by the user.

E_USER_NOTICE: Attention message caused by user.

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

E_RECOVERABLE_ERROR: A near-fatal runtime error. If not caught, it will be treated as E_ERROR.

E_ALL: Catch all errors and warnings.

Shield PHP error prompts

Method 1: Add @ in front of functions that may cause errors, and then or die("")

For example:

@mysql_connect(...) ordie("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 messages .

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

Syntax: interror_reporting(int [level]);

Return value: integer

Function type: PHP system function

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