php random string

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1function generateRandomString($length = 25) {
2    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
3    $charactersLength = strlen($characters);
4    $randomString = '';
5    for ($i = 0; $i < $length; $i++) {
6        $randomString .= $characters[rand(0, $charactersLength - 1)];
7    }
8    return $randomString;
9}
10//usage 
11$myRandomString = generateRandomString(5);

1//generates 13 character random unique alphanumeric id
2echo uniqid();
3//output - 5e6d873a4f597

1function generateRandomString($length = 10) {
2    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
3    $charactersLength = strlen($characters);
4    $randomString = '';
5    for ($i = 0; $i < $length; $i++) {
6        $randomString .= $characters[rand(0, $charactersLength - 1)];
7    }
8    return $randomString;
9}
10
11Output the random string with the call below:
12
13// Echo the random string.
14// Optionally, you can give it a desired string length.
15echo generateRandomString();

1function rand_str() {
2    $characters = '0123456789-=+{}[]:;@#~.?/&gt;,&lt;|\!"£$%^&amp;*()abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
3    $randomstr = '';
4    for ($i = 0; $i < random_int(50, 100); $i++) {
5      $randomstr .= $characters[rand(0, strlen($characters) - 1)];
6    }
7    return $randomstr;
8  }

1<?php 
2    $random = substr(md5(mt_rand()), 0, 7);
3    echo $random;
4?>

1<?php
2    function RandomString()
3    {
4        $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
5        $randstring = '';
6        for ($i = 0; $i < 10; $i++) {
7            $randstring = $characters[rand(0, strlen($characters))];
8        }
9        return $randstring;
10    }
11
12    RandomString();
13    echo $randstring;

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