PHP error and exception notes and summary (3) Error-related options in PHP configuration file (php.ini) and setting error levels

"Error-related options in PHP configuration file"

Options	Describe
Error_reporting	Set the level of error reporting
Display_errors	Whether an error is displayed
Log_errors	Sets whether to log error messages to logs or Error_log
Error_log	Set the file to which the script error will be logged
Log_errors_max_len	Set the maximum number of bytes for log_errors
Ignore_repeated_errors	Whether to ignore duplicate error messages
Ignore_repeated_source	Whether to ignore the source of duplicate error messages
Track_errors	If this option is turned on, the last error will be permanently saved in $php_errormsg

① error_reporting

For example:

error_reporting E_all

Indicates that the error level is all errors. You can also set all the error levels that are mentioned earlier in the statement.

Note: in PHP 5.4 or later, E_strict is part of the E_all.

These error levels can be used alone or in conjunction with bitwise operators .

"Example" shows all errors, but does not show that the error_reporting in Notice,php.ini should be set to:

error_reporting e_all & ~e_notice

② display_error

The development environment needs to be open (display_errors = ON) and the production environment (on-line) needs to be turned off (diaplay_errors = off).

"Set Error Level"

① through PHP configuration file settings (this is the way)

② via error_reporting () function setting (dynamic setting)

"Example 1" gets the bitmask of the current error level

<? PHP Echo error_reporting ();

Output:

30719

(the corresponding error_reporting = E_all)

"Example 2" set error level--Show all errors

<? PHP error_reporting (e_all);

"Example 3" does not display notification-level errors

<? PHP error_reporting (e_all & ~e_notice); Echo $dee;

Output:

Nothing is output.

"Example 4" Masks all errors -when deployed to a line, you can set the error level in this way to prevent information from leaking to the user

<? PHP error_reporting (0); Echo //Fatal level error

Output:

Nothing is output-even the fatal level of error (Fatal level) is unrealistic, but parsing errors (the grammar detection phase) still appear , as in Example 5

"Example 5"

<? PHP error_reporting (0); Echo Dee ()

Output:

$end, expecting ', ' or '; ' in D:\practise\php\Error\error1.php-line 3

"Example 6" shows all errors

<? PHP error_reporting ( -1); Echo Dee ();

Output:

function Dee () in D:\practise\php\Error\error1.php on line 3

③ by Ini_set () function run- time setting

"Example 1" does not show all errors

<? PHP Ini_set (' error_reporting ', 0); Echo Dee ();

Output:

Nothing is output.

Or

<? PHP Ini_set (' Display_errors ', 0); Echo Dee ();

can also achieve the effect of not showing all errors.

"Example 2" shows all errors

<? PHP Ini_set (' error_reporting ',-1); Echo Dee ();

Output:

function Dee () in D:\practise\php\Error\error1.php on line 3

"Common Settings"

In php.ini, you can set the error_reporting as follows to block hints that we think are not errors:

error_reporting e_all & ~e_notice & ~e_strict & ~e_deprecated

Or, before sending the header, all the content is output to the memory buffer (output buffering).

"Attached" ① bitwise operator

②php 5.4 or above is officially recommended to replace MySQL with mysqli

PHP error and exception notes and summary (3) Error-related options in PHP configuration file (php.ini) and setting error levels