Php: several solutions for undefined index: undefinedindex

Php: several solutions for undefined index: undefinedindex

When $ _ post [''] and $ _ get [''] are used to obtain parameters in the formNotice: Undefined index :--------;

 

Although you can hide this prompt by setting the error display mode, there is also a risk that these prompts will be recorded in the server logs, resulting in a huge Log File exception.

Summarize several solutions by searching on the Internet and using your own practices;

Method 1: Modify server configurations
Modify the php. ini configuration file, error_reporting = E_ALL &~ E_NOTICE

Method 2: Initialize the variable.

Method 3: Judge isset ($ _ post ['']), empty ($ _ post ['']) if -- else

Method 4: Add @ before the notice code appears. @ indicates that the line has an error or the warning is not output. @ $ username = $ _ post ['username'];

Method 5: The last one is very practical. It is a function written by someone else, through which values are transmitted.

 

Define a function:
Function _ get ($ str) {$ val =! Empty ($ _ GET [$ str])? $ _ GET [$ str]: null; return $ val ;}
And then directly use_ Get ('str ')Just replace $ _ GET ['str ~