How to generate random number in PHP

Ever wondered how to generate random numbers in PHP using a simple function while excluding some numbers you don't want, just like a friend of mine that requested for this code?

Here's how to do it:

<?php
function generateRandomNumber($min, $max, $excludedNumbersArr) {
    do {
        $number = rand($min, $max);
    } while (in_array($number, $excludedNumbersArr));

    return $number;
}

// Use it this way
echo generateRandomNumber(50,250,[123,145]); //This PHP function generates a number between 50 and 250, excluding 123 and 145.
?>

Explanation:

1. Set the Range: The function defines the minimum ($min) and maximum ($max) values for the random number.
2. Excluded Numbers: An array $excludedNumbersArr contains the numbers you want to exclude.
3. Generate Random Number: A do-while loop generates a random number using rand($min, $max). It continues to generate a new number until the number is not in the $excludedNumbersArr array.

4. in_array(): This is a PHP function that checks if a value exists in an array. It takes two parameters:

   Value: The value you want to search for.
   Array: The array in which you want to search for the value.

5. Return the Number: Once a valid number is generated, it is returned.

This function ensures that the generated number is within the specified range and does not include the excluded values.

Thanks for reading this article.

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