Generate Random String in PHP

Originally posted @ https://codeanddeploy.com visit and download the sample code: https://codeanddeploy.com/blog/php/generate-random-string-in-php

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In this post, I will show you an example function to generate a random string in PHP. This function is usually used to generate alphanumeric strings when creating a file name, coupon code, auto password generator, and more.

In this function is using PHP built-in functions such as strlen(), ceil(), str_repeat(), str_shuffle(), and substr().

strlen() - help to count the total chars available

ceil() - help to round up the result of length to generate random string / total chars available

str_repeat() - helps to repeat the result string

str_shuffle() - helps to randomly shuffles all available string

substr() - helps to get the random string generated

Now I will show you the complete function of this random string generator.

<?php

function randomString($length = 10) {
    // Set the chars
    $chars='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

    // Count the total chars
    $totalChars = strlen($chars);

    // Get the total repeat
    $totalRepeat = ceil($length/$totalChars);

    // Repeat the string
    $repeatString = str_repeat($chars, $totalRepeat);

    // Shuffle the string result
    $shuffleString = str_shuffle($repeatString);

    // get the result random string
    return substr($shuffleString,1,$length);
}

?>

Now, you have the function already to generate random string its time to call this function and display the result.

<?php

function randomString($length = 10) {
    // Set the chars
    $chars='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

    // Count the total chars
    $totalChars = strlen($chars);

    // Get the total repeat
    $totalRepeat = ceil($length/$totalChars);

    // Repeat the string
    $repeatString = str_repeat($chars, $totalRepeat);

    // Shuffle the string result
    $shuffleString = str_shuffle($repeatString);

    // get the result random string
    return substr($shuffleString,1,$length);
}

// Display the generated string
echo randomString();

?>

As you can see above code I echo the randomString() and this is the result below:

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Now you have already how to generate random strings in PHP. It's time to implement it in your project. I hope this tutorial can help you. Kindly visit here https://codeanddeploy.com/blog/php/generate-random-string-in-php if you want to download this code.

Happy Coding :)