Generating a random 10 digit number

Mornin all, I have what should be an easy q today...

I have a form that a user fills out and when they hit submit, it does a number of things, one, it checks to see if the email address supplied is already in the db (in which case it kicks back an error n halts), otherwise, it comes back with a visual confirmation showing all data and loads the information into the db as a new record.

What I'm trying to do is to have it so that a unique, 10 digit number is autogenerated and attached to the same record that's returned and also loaded to the db with that same record. A serial number would be a fair description.

Any ideas?

Which part are you stuck with? Generating the number, or storing it in the database?

well there are a few ways at doing that.

1. One large rand():

PHP Code:

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$serial = rand(1111111111, 9999999999); 


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That will make a random 10 digit string.

2. You can have several rand()'s and make it more random:

PHP Code:

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$serial = rand(111, 999) . rand(111,999) . rand(11, 99) . rand(11, 99); 


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dclamp sollution is very nice but you still didn't answer if you have problem only with the random number or when storing it in database!

Also there are 2 other sollutions:

1)
srand((double)microtime()*1000000);
echo rand(1000000000,9000000000);

2)
$value_s = mktime(0,0,0,date('d'),date('m'),date('Y'));
echo $value_s;

Yep. Try to use rand(); function.

PHP Code:

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$whatever = rand(1000000000, 9999999999); 


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If you want a random 10-Digit string then:

PHP Code:

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$token = substr(md5(rand(1000000000, 9999999999)), 0, 10); 


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