Create Random Serial with PHP
<p>I want to have a random serial created on my website everytime someone visits.</p>

<p>The format of the serial should be XXXXX-XXXXX-XXXXX-XXXXX.</p>

<p>X represents a random number or capital letter.
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Unfortunately I have no idea how to do this. Could anybody please help me out?</p>

<p>So for example the random serial output could be: 3WT4A-NB34O-JU87P-B3UHS
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Thanks a lot!</p>
