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Sometimes you need to generate unique randon numbers if you want to assign IDs to your members or assign unique values to your shopping cart items. Here I`m just citing to reason whereas it depends on you for what purpose you`d like to generate a random number in your PHP scripts. I have written a small function that takes one argument. This argument tells the function how many digits you want in the generated number.

For a live example of the article, go to http://www.aboutwebdesigning.com/2005/09/29/generate-a-random-number-using-php

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First, here`s the function:

function random_num($n=5)
{

return rand(0, pow(10, $n));
}

If you send no argument to the random_num() function, it generates a 5-digit random number. This is how we use it:

echo random_num(); gave 96161 when tested and
echo random_num(7); gave 5983582 when tested

This function uses the PHP math function pow() to get the number of digits we want. The function pow() calculates the power of a number like say 10 raised to the power 5. In math we write it like 10 Exp 5. Basically, the real rand() function takes 2 arguments: the lower limit and the upper limit. So if you want to generate a random number that should be greater than 107 and less than 5067, you might get somethin like:

echo rand(107, 5067); gave 3456 when tested

Since we normally don`t need the upper limits and the lower limits, I`ve elucidated a generic function that gives you a random number of spedicif number of digits.

For more information about this article and/or the author visit http://www.aboutwebdesigning.com/2005/09/29/generate-a-random-number-using-php

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