String with random number and alphabets

We can generate a set of random digits by combining a set of alphabets and numbers. After this our random string will have a random combination of alphabets and numbers. You can read how to generate random numbers by reading math random generator and how to generate random alphabets here .

We will use these two methods to generate random numbers and random characters. We will add ( or combine ) these two to get our random string. Here to get a combination we will use random methods so the positions of numbers and alphabets are not fixed.

Using this you can generate random password strings for any application ( like login script etc )
Now we will keep the script inside a function and use it when required. Here we will make it flexible by accepting one input to the function by which we will tell how many digits are required. So the length of the random string can be managed based on the script design.

Here is the full function with detail explanation with it ( read the comments )
function random_generator($digits){
srand ((double) microtime() * 10000000);
//Array of alphabets
$input = array ("A", "B", "C", "D", "E","F","G","H","I","J","K","L","M","N","O","P","Q",

$random_generator="";// Initialize the string to store random numbers
for($i=1;$i<$digits+1;$i++){ // Loop the number of times of required digits

if(rand(1,2) == 1){// to decide the digit should be numeric or alphabet
// Add one random alphabet 
$rand_index = array_rand($input);
$random_generator .=$input[$rand_index]; // One char is added


// Add one numeric digit between 1 and 10
$random_generator .=rand(1,10); // one number is added
} // end of if else

} // end of for loop 
return $random_generator; } // end of function echo random_generator(10); ?>

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    PHP String Functions
    arman patel


    very comprencive and use full tutorial for me thx.


    WOW thanks for this!


    This is another method to do it, but there are others. Good job using mt_rand not many use it!


    good code for beginner


    easy and simple tutor. are available here
    Php Programmer


    Great!! This tutorial was really helpful to create a random number and alphabets. Simple but effective.


    Post your comments , suggestion , error , requirements etc here .

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