Help With Generating A License Key From PHP

Hi Everyone, I have the following piece of code, that I am trying to create a license key from, But when I echo out the variable, For some reason, The variable is not being displayed.

Here is the code I have -

//Generate License Key -

$MyKey = strtoupper(substr(md5(rand()), 0, 4)) . "-" . strtoupper(substr(md5(rand()), 0, 4)) . "-" . strtoupper(substr(md5(rand()), 0, 4));

Looking to have this fixed right away, Ready to pay,

Skills: HTML, Javascript, MySQL, PHP, Software Architecture

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