undefined-index - w3toppers.com

Undefined index with $_POST [duplicate]

In PHP, a variable or array element which has never been set is different from one whose value is null; attempting to access such an unset value is a runtime error. That’s what you’re running into: the array $_POST does not have any element at the key “username”, so the interpreter aborts your program before … Read more

“Notice: Undefined variable”, “Notice: Undefined index”, “Warning: Undefined array key”, and “Notice: Undefined offset” using PHP

Notice / Warning: Undefined variable From the vast wisdom of the PHP Manual: Relying on the default value of an uninitialized variable is problematic in the case of including one file into another which uses the same variable name. It is also a major security risk with register_globals turned on. E_NOTICE level error is issued … Read more