Managing Application Settings in PHP

There are multiple ways to save application settings/configurations in PHP. You can save them in INI, XML or PHP files as well as a database table. I prefer a combination of the latter two; saving the database connection details in a PHP file and the rest in a database table.
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PHP Notice: Undefined index

I have had a few times when coding where I get the error PHP Notice: Undefined Index, I found the below solution to this issue which is an extremely simple fix!
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Warning: Cannot modify header information – headers already sent by…

Ok so today i was doing some PHP coding and get the dreaded header error caused me a bit of a headache as i needed to redirect some pages. After a bit of searching i managed to find an alternative to using:

So to get rid of the error that this produces simply change it to any of the below:

OR

OR

i used the last option as i found this worked best compared to the others with my program however they may all work well for your application