How do I encrypt my url from within my php/mysql application

i have a url like the attached.  After the php/mysql application is run, a confirmation page is shown and an email is sent to the client both have the url included.  I need to encrypt this url.  i don't know how to do this from within the application.  some have suggested setting a random number generator, attaching that to the ID number.  I think i just need to encrypt teh ID_NUMBER which is 202 in this case. How do i do that without disrupting the rest of the application? Where do I start?

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Vel EousResearch & Development ManagerCommented:
You could use base64 to encode/decode the ID_NUMBER variable:

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justmelatAuthor Commented:
hope someone could guide me along in this:

I have added this to my code below, but when I look in my db I only see the letter S in the field that should hold the encrypted value: when i echo the variable - I have this: strong hold is : TGF0cmVsbGUgRnJlZW1hbg==
 $holdStrong = base64_encode("testID");
        echo "strong hold is : ".$holdStrong;

               $sql .=  $this->reqNum . "','$status', '$holdStrong','$option','$theCompany','".date('Y-m-d')."')";
Vel EousResearch & Development ManagerCommented:
In your SQL statement above, the strong and status field value pairs appear to be mixed.

Your fields are STRONG, STATUS however your values are $status, $holdStrong.

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