PHP Hint notice:undefined index solution

PHP hint notice:undefined index problem, Undefined index: refers to the existence of your code: "Variables are not defined, assigned to use" error, this is not a fatal error, will not let your PHP code run forcibly aborted, but there is a potential problem of the danger ......

Occurs when reading data:

Notice:undefined Index:name in ...

Notice:undefined Index:key in ...

The source code is as follows:

$name = isset ($_post[' name ')? Filter_input (input_post, ' name ', Filter_sanitize_special_chars): Htmlspecialchars ($_get[' name ');

$key = isset ($_post[' key ')? Filter_input (input_post, ' key ', Filter_sanitize_special_chars): Htmlspecialchars ($_get[' key ');

Problem Analysis:

Undefined index: Refers to the existence of your code: "Variables are not defined, assigned to use" error, this is not a fatal error, will not let your PHP code run forcibly aborted, but there is a potential problem of the risk, it is recommended to modify ~ ~ ~

Workaround:

with php.ini error_reporting = E_all & ~e_notice can turn off the display of NOTICE, shielding out such warnings good, however, the proposal or change the code a little better, code always write a good specification, the future can be less problems ah.

Problem reason: Because you only check $_post existence, but do not check the existence of $_get.

the perfect solution : modify it as shown below:

$name = isset ($_post[' name ')? Filter_input (input_post, ' name ', Filter_sanitize_special_chars): Isset ($_get[' name '])? Filter_input (input_post, ' name ', filter_sanitize_special_chars): ';

$key = isset ($_post[' key ')? Filter_input (input_post, ' key ', Filter_sanitize_special_chars): Isset ($_get[' key ')? Filter_input (input_post, ' key ', filter_sanitize_special_chars): ';

First of all, this is not a mistake, it is warning. Therefore, if the server cannot be changed, each variable should be defined before use.

Method 1: Server configuration Modifications
Modify the php.ini configuration file, error_reporting = E_all & ~e_notice

Method 2: Initialize the variables, standardize the writing (more cumbersome, because there are a lot of variables). But have not found a good definition method, I hope you advise

Method 3: Each file header plus: error_reporting (0); If not, only open php.ini, find display_errors, set to Display_errors = Off. Any future errors will not be prompted.

Method 4: Make a Judgment: isset ($_get["page"]) If-else judgment

or add "@" to indicate this line if there is an error or warning do not output
such as: @ $page =$_get["page"]

Method 5:file1.php file to pay a value $xx variable, with post to file2.php,
If the file2.php does not have the definition of $xx, the direct use of $yy= $xx; The system will be error: "Undifined variaable $xx", if file2.php's files start with $xx= ""; definition, then file1.php $xx value will not pass!

File2.php can do that.
if (!isset ($xx)) $xx = "";

========================== Method 3: Each file header plus: error_reporting (0); Solve

PHP Hint notice:undefined index solution