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<?php
//generate a random number
//result: 18785 (example)
echo rand();

//generate a random number between 0 and 100
//result: 4 (example)
echo rand(0, 100);
?>

Generating a random number in PHP is as simple as calling the rand( ) function. The getrandmax( ) function is a good choice in here where it returns the maximum value that rand( ) could possibly generate on your system. Here's an illustration:

<?php
// generate a random floating-point number
// result: 0.721182897427 (example)
echo rand()/getrandmax();
?>

If you need more than one random number, use rand( ) in combination with a loop and array such as:

<?php
//generate a series of 10 random numbers between 0 and 100
//result: "12 95 88 87 61 49 61 4 99 75" (example)
for ($x=0; $x<10; $x++) {
  echo rand(0, 100) . " ";
}
?>