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PHP random string generator

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I’m trying to create a randomized string in PHP, and I get absolutely no output with this:

    function RandomString()
        $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
        $randstring = '';
        for ($i = 0; $i < 10; $i++) {
            $randstring = $characters[rand(0, strlen($characters))];
        return $randstring;

    echo $randstring;

What am I doing wrong?

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  1. hii,

    To answer this question specifically, two problems:

    1. $randstring is not in scope when you echo it.
    2. The characters are not getting concatenated together in the loop.

    Here’s a code snippet with the corrections:

    function generateRandomString($length = 10) {
        $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
        $charactersLength = strlen($characters);
        $randomString = '';
        for ($i = 0; $i < $length; $i++) {
            $randomString .= $characters[rand(0, $charactersLength - 1)];
        return $randomString;

    Output the random string with the call below:

    // Echo the random string.
    // Optionally, you can give it a desired string length.
    echo generateRandomString();
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