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

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Peter MortensenCaptain LightningCaptain Lightning

53 Answers

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:

Output the random string with the call below:

Please note that this generates predictable random strings. If you want to create secure tokens, see this answer.

steadwebStephen WatkinsStephen Watkins

Note: str_shuffle() internally uses rand(), which is unsuitable for cryptography purposes (e.g. generating random passwords). You want a secure random number generator instead. It also doesn't allow characters to repeat.

UPDATED(now this generates any length of string):

That's it. :)

A. CheshirovA. Cheshirov

There are a lot of answers to this question, but none of them leverage a Cryptographically Secure Pseudo-Random Number Generator (CSPRNG).

The simple, secure, and correct answer is to use RandomLib and don't reinvent the wheel.

For those of you who insist on inventing your own solution, PHP 7.0.0 will provide random_int() for this purpose; if you're still on PHP 5.x, we wrote a PHP 5 polyfill for random_int() so you can use the new API even before you upgrade to PHP 7.

Batman arkham city manual activation serial key codes. Safely generating random integers in PHP isn't a trivial task. You should always check with your resident StackExchange cryptography experts before you deploy a home-grown algorithm in production.

With a secure integer generator in place, generating a random string with a CSPRNG is a walk in the park.

Creating a Secure, Random String

Usage:

Demo: https://3v4l.org/IMJGF (Ignore the PHP 5 failures; it needs random_compat)

Scott ArciszewskiScott Arciszewski

This creates a 20 character long hexadecimal string:

In PHP 7 (random_bytes()):

Peter MortensenRudieRudie

@tasmaniski: your answer worked for me. I had the same problem, and I would suggest it for those who are ever looking for the same answer. Here it is from @tasmaniski:

Here is a youtube video showing us how to create a random number

HumphreyHumphrey

Depending on your application (I wanted to generate passwords), you could use

Being base64, they may contain = or - as well as the requested characters. You could generate a longer string, then filter and trim it to remove those.

openssl_random_pseudo_bytes seems to be the recommended way way to generate a proper random number in php. Why rand doesn't use /dev/random I don't know.

rjmunrorjmunro

Here is a simple one-liner that generates a true random string without any script level looping or use of OpenSSL libraries.

To break it down so the parameters are clear

This method works by randomly repeating the character list, then shuffles the combined string, and returns the number of characters specified.

You can further randomize this, by randomizing the length of the returned string, replacing $chrRandomLength with mt_rand(8, 15) (for a random string between 8 and 15 characters).

Peter MortensenKraang PrimeKraang Prime

A better way to implement this function is:

mt_rand is more random according to this and this in PHP 7. The rand function is an alias of mt_rand.

Peter Mortensen

$randstring in the function scope is not the same as the scope where you call it. You have to assign the return value to a variable.

Or just directly echo the return value:

Also, in your function you have a little mistake. Within the for loop, you need to use .= so each character gets appended to the string. By using = you are overwriting it with each new character instead of appending.

BoltClock♦BoltClock

First, you define the alphabet you want to use:

Then, use openssl_random_pseudo_bytes() to generate proper random data:

Finally, you use this random data to create the password. Because each character in $random can be chr(0) until chr(255), the code uses the remainder after division of its ordinal value with $alphabet_length to make sure only characters from the alphabet are picked (note that doing so biases the randomness):

Alternatively, and generally better, is to use RandomLib and SecurityLib:

Here are some shortest method to generate the random string

Punit GajjarPunit Gajjar

I've tested performance of most popular functions there, the time which is needed to generate 1'000'000 strings of 32 symbols on my box is:

Please note it is not important how long it really was but which is slower and which one is faster so you can select according to your requirements including cryptography-readiness etc.

substr() around MD5 was added for sake of accuracy if you need string which is shorter than 32 symbols.

For sake of answer: the string was not concatenated but overwritten and result of the function was not stored.

PutnikPutnik

This one was taken from adminer sources:

Adminer, database management tool written in PHP.

userlonduserlond

One very quick way is to do something like:

This will generate a random string with the length of 10 chars. Of course, some might say it's a bit more heavy on the computation side, but nowadays processors are optimized to run md5 or sha256 algorithm very quickly. And of course, if the rand() function returns the same value, the result will be the same, having a 1 / 32767 chance of being the same. If security's the issue, then just change rand() to mt_rand()

BassMHLartnikproartnikpro

Source from http://www.xeweb.net/2011/02/11/generate-a-random-string-a-z-0-9-in-php/

mike_t

The edited version of the function works fine, but there is just one issue I found: You used the wrong character to enclose $characters, so the ’ character is sometimes part of the random string that is generated.

To fix this, change:

Advanced office password recovery serial key 6.04. to:

This way only the enclosed characters are used, and the ’ character will never be a part of the random string that is generated.

Peter Mortensen

Another one-liner, which generates a random string of 10 characters with letters and numbers. It will create an array with range (adjust the second parameter to set the size), loops over this array and assigns a random ASCII character (range 0-9 or a-z), then implodes the array to get a string.

Note: this only works in PHP 5.3 and later

Peter Mortensen

One liner.

It is fast for huge strings with some uniqueness.

Peter Mortensen

I liked the last comment which used openssl_random_pseudo_bytes, but it wasn't a solution for me as I still had to remove the characters I didn't want, and I wasn't able to get a set length string. Here is my solution..

Peter Mortensen

Another way to generate a random string in PHP is:

Peter MortensenAkhilraj N SAkhilraj N S

Parametrised one-liner using only PHP native functions, working since PHP 5.1.0

user10099user10099

There is simple code:

There is a simple guide:

• To change the length of string, please change the 16 to another value, only.
• To select from different characters, please change the character string.

Peter Mortensen

There are better alternatives to this. Many was already posted so I give you only your stuff back with fixes:

Also you may be interested in:

Or another one:

Peter MortensenGeoGeo

Here is how I am doing it to get a true unique random key:

You can use time() since it is a Unix timestamp and is always unique compared to other random mentioned above. You can then generate the md5sum of that and take the desired length you need from the generated MD5 string. In this case I am using 10 characters, and I could use a longer string if I would want to make it more unique.

I hope this helps.

James McCracken

protected by animuson♦Jul 17 '13 at 22:51

Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
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