This is a very simple but useful technique. There are a lot of instances where you will need random numbers, and it might be hard to see where you would, but I have use them lots of times for scripts and found this command extremely useful.

This would create a random number between 1 and 100. In most cases you will be puting it to a variable so this would be your code:

This sets a random number between 1 and 250 to the variable.

perhaps you should also discuss the maximum value for random number

and rand function without argument will give any random value of integer range.

You'd be better off using mt_rand() which produces better random numbers using a Mersenne Twister, and it's also faster than rand().

I agree with blokey.

And if you want random hashes, this should be sufficent:

That gives you 32 characters long string.

why would some one need a random hash? for validation?

I am using random numbers for my online examination project, it is possible to avoid question alrady displayed not to displayed again ?

isn't it that you made a function to randomly get a row of items from a dbase table? modify and use it.

Where all can we use rand() , i use it only for captcha's . Can it be used for any better things.