There are a few problems in the process of learning CI framework today:
A PHP Error was encountered
Severity:notice
message:undefined Variable:user
Generally in the default normal php file output an undefined declaration of the variable is not reported wrong, but in the CodeIgniter framework to report errors, which for the integration to add and modify the page in one of the "lazy" is very inconvenient, Because it is a beginner, how do you want to block this error in the code? Even with the @, but listen to a lot of people say @ will greatly reduce performance ....
Finally suddenly thought, is not codeigniter intentionally let this error message out, how should we go to block this kind of error? accidentally searched "How to let CodeIgniter not show notice information?", Enlightened. The original is the entrance index.php in the error_reporting (E_all); just change it to
Error_reporting (e_all ^ e_notice);
You can block out this error without affecting other errors.
Below are some of the information that we searched for:
Error_reporting () Sets the error level for PHP and returns the current level.
Grammar
Error_reporting (Report_level)
If the parameter level is not specified, the current error levels are returned. The following items are possible values for level:
1 E_error
2 e_warning
4 E_parse
8 E_notice
E_core_error
E_core_warning
E_compile_error
E_compile_warning
E_user_error
E_user_warning
1024x768 E_user_notice
2047 E_all
2048 e_strict
E_notice indicates that the general situation is not recorded and is only used if the program has an error condition, such as attempting to access a nonexistent variable, or calling stat () to view files that do not exist.
E_warning are usually displayed, but do not interrupt the execution of the program. This is very effective for debugging. For example: Call Ereg () with a problematic regular representation.
The e_error is usually displayed, and the program execution is interrupted. This mask cannot be traced to a memory configuration or other error.
E_parse parse the error from the syntax.
E_core_error is similar to E_error, but does not include errors caused by PHP core.
E_core_warning similar to e_warning, but does not include PHP core error warnings.
Error reporting for PHP
There are many configuration settings in the php.ini file. You should have your own php.ini file set up and put it in the appropriate directory, as shown in the documentation for installing PHP and Apache 2 on Linux. When debugging a PHP application, you should know two configuration variables. The following are the two variables and their default values:
Display_errors = Off
error_reporting = E_all
By searching for them in the php.ini file, you can find the current default values for both variables. The purpose of the display_errors variable is obvious-it tells PHP if it shows an error. The default value is OFF. However, to make the development process easier, please set this value to on:
Display_errors = On
The default value for the error_reporting variable is e_all. This setting shows all the information from bad coding practices to harmless prompts to errors. E_all is a bit too thin for the development process because it shows hints on the screen for small things (such as uninitialized variables), which can mess up the browser's output. I just want to see errors and bad coding practices, but don't want to see harmless hints. Therefore, replace the default value of error_reporting with the following values:
error_reporting = E_all & ~e_notice
Restart Apache and it's all set up. Next, you'll learn how to do the same thing on Apache.
Error reporting on the server
Depending on what Apache is doing, opening an error report in PHP may not work because there may be multiple versions of PHP on your computer. It is sometimes difficult to tell which PHP version Apache is using because Apache can only view one php.ini file. It is a security issue to not know which php.ini file Apache is using to configure itself. However, there is a way to configure PHP variables in Apache to ensure that the correct level of error is set.
Also, it is best to know how to set these configuration variables on the server side to veto or preempt php.ini files, providing a higher level of security.
When you configure Apache, you should have been exposed to the basic configuration in the http.conf file in/conf/httpd.conf.
To do what has already been done in the php.ini file, add the following lines to httpd.conf, overwriting any php.ini files:
Php_flag display_errors on
Php_value error_reporting 2039
This overrides the flags already set for display_errors in the php.ini file, as well as the value of error_reporting. A value of 2039 represents E_all & ~e_notice. If you prefer to use E_all, set the value to 2047. Again, you'll restart Apache.
Next, you will test the error report on the server.
About error_reporting () This function, it can be blocked to some error message, but the PHP core caused by the error, is not blocked, because the PHP core error will directly lead to PHP file compilation failure, because the writing format is not written according to the Code rules of PHP errors caused by , it can't be blocked.
Copy the Code code as follows:
* For now, avoid warnings of e_strict mode
* (This must is done before function definitions)
*/
if (defined (' e_strict ')) {
$old _error_reporting = error_reporting (0);
if ($old _error_reporting & e_strict) {
Error_reporting ($old _error_reporting ^ e_strict);
} else {
Error_reporting ($old _error_reporting);
}
unset ($old _error_reporting);
The following are common:
Copy the Code code as follows:
Turn off all error reporting;
error_reporting (0);
Report easy running errors; reporting a simple run error
Error_reporting (E_error | e_warning | E_parse);
Reporting E_notice can good too (to report uninitialized
Variables or catch variable name misspellings ...); Includes spelling errors that report some uninitialized variables or catch variable names
Error_reporting (E_error | e_warning | E_parse | E_notice);
Report all errors except E_notice
This is the default value of set in php.ini; all errors are reported but not included E_notice which is also the default setting for PHP.ini
Error_reporting (e_all ^ e_notice);
Report All PHP errors (bitwise is used in PHP 3); reports all errors
Error_reporting (E_all);
Same as error_reporting (E_all); ibid.
Ini_set (' error_reporting ', e_all);
The above describes the use of the error_reporting function in the Crystal Report PHP to modify the PHP mask error, including the Crystal Report content, I hope to be interested in PHP tutorial friends helpful.
