Random AlphaNumeric String

Mar 28, 2007

All I need to know is how to come up with a random alphanumeric string 24 characters long. Such as Dj53dljgdg97dgfhgf879ngf. It doesn't need to contain upper-case letters.

*Alphanumeric means containing letters and numbers


Generating Random (alphanumeric) String?

Jan 30, 2011

Generating (pseudo)random alpha-numeric strings

How to genearte random string in PHP? Numbers are not a problem, but how to deal with letters efficiently?

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Generate A Random, Unique, Alphanumeric String?

Jun 14, 2011

PHP: How to generate a random, unique, alphanumeric string? want to generate random token [alphanumeric] for random length [between 4-6] characters.

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Generating Specific Unique Random Alphanumeric String?

Dec 29, 2009

I want to generate a unique alphanumeric string having specific length and having specific characters used. For example I want to create random string having several alphabets initially then some numbers then some alphabets again.


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Input String $foo Which Contains Both Alphanumeric And Non-alphanumeric Characters?

Jun 26, 2011

I have an input string $foo which contains both alphanumeric and non-alphanumeric characters.I use ereg_replace to $foo to replace all non-wanted chars with empty chars. Now I want to know what were these "erased" chars. How can I do this?

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How To Create Unique 10-digit Random Alphanumeric Codes?

Aug 28, 2004

How can I create unique 10-digit random alphanumeric codes, such as 87i6se3Hfs or 7Gjg668dOh, etc?

I know I probably could have a loop that runs 10 times to get this code, but how can I be sure it's unique everytime? And it should have some kind of a security that keeps people from changing one of two digits/letters to get another valid code. It's like a checksum on your credit card number, I guess.

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Random Alphanumeric Generator To Return A Unique Booking Reference Doesn't Work

Apr 15, 2010

A user registers the learners details. At this point I use a Random Alphanumeric Generator to return a unique booking reference which is used at the checkout to bring back all the details of their booking. However, sometimes it doesn't seem to work. When I look at the database I see that (in one example) it has generated the same alphanumeric value which is why at the checkout it returns more than what the person thought they had booked. Here's the code for the generator...

function randomPrefix($length)
$random= "";
$data .= "aBCdefghijklmn123opq45rs67tuv89wxyz";
$data .= "0FGH45OP89";

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Reg Exp To Null / Empty String If String Contains Non Alphanumeric Characters

Jul 4, 2010

I'm looking for a php preg replace to null/empty string if string contains any non alphanumeric characters or spaces e.g. Strings

$string = "This string is ok";
$string = "Thi$ string is NOT ok, and should be emptied"

When I say emptied/nulled I mean it will make the string "". So basically anything a-z A-Z 0-9 or space is ok

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How Can I Know If A String Is Alphanumeric?

Jan 21, 2006

How can I know if a string only has alfanumeric chars?

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Short Alphanumeric String

Dec 4, 2006

I have a variable set as a vary long integer. This integer is unique to the user. What I am trying to do is to cut down on the length of the integer, while still maintaining its uniqueness. I'm thinking somehow converting this number from being numeric (10 characters) to alphanumeric (36 characters) will help me cut this number by more than a third.

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Get Numeric Value From A Alphanumeric String?

Feb 5, 2010

i want a function or a code to get numeric value from the string whose value is "2008 Revenue 5,700,390,000". the output that i want is $5,700,390,000.

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Replace Every Character In A String If It Is Not Alphanumeric

Jul 17, 2005

Has anyone an idea how i can replace every character in a string if it is not alphanumeric ?

something like eregi_replace, but i don't know how i say in regex NOT.

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Trying To Detect Non Alphanumeric Characters In A String

Aug 2, 2004

I have a column in a database that I want to display only if it containes letters, numbers and dashes. I don't want to display the name if it contains characters like "©", ">", accented letters, umlauts etc...

I have tried a few variants of the following but nothing seeems to work.

if(!preg_match('[^A-Za-z0-9]+', $line[name])){
print $line[name];

Any ideas what's wrong?

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Generate A 2 Char Alphanumeric String?

Sep 25, 2009

what is the fastest way to generate a random two long alphanumeric character?

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Stripping Everything But Alphanumeric Chars From String?

May 8, 2009

I'd like a regexp or other string which can replace everything except alphanumeric chars (a-z and 0-9) from a string. All things such as ,@#$(@*810 should be stripped. Edit: I now need this to strip everything but allow dots, so everything but a-z, 1-9,

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Removing All Non-alphanumeric Characters At End Of String?

Apr 6, 2011

How does one remove all non-alphanumeric characters at the end of a string. Eg:

Quick @# brown fox -
Quick @# brown fox##
Quick @# brown fox
Quick @# brown fox @$#

all become

Quick @# brown fox

Seeking to possibly use preg_replace because ereg_replace is deprecated. It could also be tweaked to allow specific non-alphanumeric characters at end of string, eg quotes, exclamation marks, question marks

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Strip All Non-alphanumeric Characters From A String?

May 17, 2011

I would like to know how to strip all non-alphanumeric characters from a string except for underscores and dashes in PHP.

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Sequential Alphanumeric String Generator

Nov 23, 2007

I was wondering how I would generate a set of Alphanumeric strings with PHP. So the script would run and output something like:

...and so on.

Alpha would be good, although Alphanumeric would be much better. Also the option to define how many characters long the string can be would be a plus.

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Generate Randomized Alphanumeric String

Oct 29, 2007

I am off trying to see if I can create a ticket reservation system, where a visitor should be able to reserve tickets and get a randomized unique alphanumeric string in uppercase letters with a total of 8 characters.

I do not know how to create a script that randomizes letters, from A-Z, and puts it into a string only 8 characters long. To compare it with already stored "randomized" in a database, I guess it is only to do a search in the database.

Anyone who has a good advice or script on how to generate what I would like to


I guess you all know what I am after.

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Remove NON Alphanumeric Characters From A String

May 24, 2007

how do i remove NON alphanumeric characters from a string including spaces.

example : if i have a string like:

$mystring = " hEllo, my_fav-Number^is&256! ";

i want result to be : hEllomyfavNumberis256

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Finding First And Last Char Positions In An Alphanumeric String

Feb 22, 2006

How do I find the first and last non-numeric char positions (using
regexp) in an alphanumeric string?

For example,
99ABC1A => should return 2, 6
DE8A1 => should return 0, 3

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Remove All Non-alphanumeric And Non-space Characters From A String?

Mar 23, 2010

I want to remove all non-alphanumeric and space characters from a string. So I do want spaces to remain. What do I put for a space in the below function within the [ ] brackets:

ereg_replace("[^A-Za-z0-9]", "", $title);

In other words, what symbol represents space, I know represents a new line, is there any such symbol for a single space.

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Stripping Leading Character From An Alphanumeric String?

Feb 19, 2011

I've got several strings of the type id1, id2, id125, id1258, etc.What I want to achieve using php is to strip the word "id" from those strings and get only the numbers in integer format in php. How can I do this?

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Regex Validate Alphanumeric String With Slashes?

Oct 29, 2010

May be I got up on the wrong side of the bed but why this simple regex doesn't work ?

PHP Code:
if (preg_match("#^[0-9a-z/]+#i", "/user/1/***")) {
echo "A match was found.";
} else {
echo "A match was not found.";
// give A match was found.

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Strip Non Alphanumeric Characters And Limit String To Two Words?

Feb 21, 2011

I'm trying to strip non-alphanumeric characters from a string and limit the string to two words. i.e:

foo bar baz => foo-bar
boo * test => boo-test
te%st_foo => test-foo

But going wrong somewhere, these are snippets I've just snapped together to try and get the results I'm after.The problem is really if there is more than 1 space in a string etc.

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Produce An Short Alphanumeric String From A Long Md5 Hash?

Jul 22, 2010

This is for the purpose of having a nice short URL which refers to an md5 hash in a database. I would like to convert something like this:


into something like this:


Those both contain about the same amount of information. The method doesn't have to be direct and reversible but that would be nice (more flexible). At the least I would want a randomly generated string with the hex hash as the seed so it is reproducible. I'm sure there are many possible answers, I am curious to see how people would do it in an elegant way. this doesn't have to have perfect 1:1 correspondence with the original hash but that would be a bonus (I guess I already implied that with the reversibility criteria). And I would like to avoid collisions if possible.

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Generate A Random String (using 3 Strings And Random Numbers)

Feb 15, 2011

I have three strings and i want to generate a random string using those 3 strings with including some random number between the strings.

Ex: first string : john
second string : smith
third string : john9k

I want a random string like : john.simth190, smith.john9k, john9k.123.smith, etc.,

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Map (large) Integer On (small In Size (alphanumeric String) Cantor?

Jun 8, 2010

I can't figure out how to optimally do the following in PHP: In a database, I have messages with a unique ID, like 19041985. Now, I want to refer to these messages in a short-url service but not using generated hashes but by simply 'calculate' the original ID. In other words, for example: [URL] should let me calculate the message ID the visitor would like to request.

To make it more obvious, I wrote the following in PHP to generate these 'alphanumeric ID versions' and of course, the other way around will let me calculate the original message ID. The question is: Is this the optimal way of doing this? I hardly think so, but can't think of anything else.

$alphanumString = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_';
for($i=0;$i < strlen($alphanumString);$i++)
$alphanumArray[$i] = substr($alphanumString,$i,1);
$id = 19041985;
$out = '';
for($i=0;$i < strlen($id);$i++) {

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Add A Random Character In A String At Random Position?

Jun 28, 2011

How can i add a single random character (0-9 or a-z or - or _) at a random place in a string.

I can get the random position by following:

$random_position = rand(0,5);

Now How can i get a random number ( 0 to 9 ) OR random character (a to z) OR (-) OR (_)

and finally how i can add character to the above string in the above random position.

For example following is string:

$string = "abc123";
$random_position = 2;
$random_char = "_";

the new string should be:


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Title String - Warning: Preg_match() [function.preg-match]: Delimiter Must Not Be Alphanumeric Or Backslash

Sep 14, 2007

I have these vars:

$query = "cyan";
$line = "91. <a title="href=http://www.cyanstudio.com/><b>CYAN</b>STUDIO.COM </a><br>";

now I try to find if cyan is in the title string. So I do it like this:

preg_match('$query', $line, $matches);
but then I get this error:

Warning: preg_match() [function.preg-match]: Delimiter must not be alphanumeric or backslash

Any ideas?

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Jul 17, 2005

How can i write a PHP regular expression matching the string that
consists of just alphanumeric and "_". And that string should start with

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Sep 11, 2009

I want to find random string between main string.


$string="Sign up for Facebook to connect with Jean Profession";

I want do that ..

random word who having length greater than 4 and word not equal to Facebook.

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Sep 10, 2007

<?php echo "<img src='/includes/seccode.inc.php?randomString=' . md5(microtime()) . '' width=&#3971;' height=&#3921;' align='absmiddle'>"?></td>

to append a random string on the secure code (captcha script) in the SOURCE CODE i get

the following <img src='/includes/seccode.inc.php?randomString=' . md5(microtime()) . '' width=&#3971;' height=&#3921;' align='absmiddle'></td>

rather than the actual value of randomstring which should be appended.

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Sep 25, 2003

Wrote this to generate random strings for resetting passwords, and it's meant to return a 10 character string - but for some reason it sometimes returns less than 10 characters.
PHP Code:

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Feb 9, 2007

If I have random and unpredictable user agent strings containing URLs, what is
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For example, let's say the string looks like this:

registered NYSE 943 <a href="http://netforex.net"Forex Trading Network
Organization </ainfo@netforex.org

What's the best way to extract http://netforex.net ?

I have code that checks for identifiable browsers and bots, but when the agent
string has no identifiable information other than a URL, I want to grab the URL.

Here's a first crack at it:
[code omitted]
elseif (eregi("http://", $agent))
$agent = stristr($agent, "http://");
$agent = parse_url($agent);
$agent = $agent['host'];
//check for subdomains
$agent_a = explode(".", $agent);
$agent_r = array_reverse($agent_a);
$sub = count($agent_r) - 1;
$tld3 = substr($agent_r[0], 0, 3);
if (eregi("^(com|net|org|edu|biz|gov)$", $tld3)) //common tld's
while ($sub 0)
$domain = $domain.$agent_r[$sub].".";
$refurl = $domain.$tld3;
$referrer = "<a href='".$refurl."'>".$refurl."</a>";
$referrer = "unknown";

Are there any PHP functions that will help here? How to handle sub domains?
International domains?

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Jul 17, 2005

Please tell me how I can randomly select a string from a limited set
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With equal probability, suppose half the time I want
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able to put something into my link such as:
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Apr 22, 2006

I have to set $vote to one of these


how can i do this and make it random?

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Dec 27, 2005

If i wanted to pull a random string from an array, lets say for like a quote of the day

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$todays_quote = ?

What function could i use to provide the variable $todays_quote with a quote from our list?

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May 12, 2009

I know that the rand function in PHP generates random integers, but what is the best way to generate a random string such as:

Original string, 9 chars
$string = 'abcdefghi';
Example random string limiting to 6 chars
$string = 'ibfeca';

UPDATE: I have found tons of these types of functions, basically I'm trying to understand the logic behind each step.

UPDATE: The function should generate any amount of chars as required.

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Mar 1, 2011

I'm looking to produce a random 10 character string like: abcABC0123 when the below method is called:

function randomize(){
$chars = explode(' ',(range("a","z"))) . explode(' ',(range("A","Z"))) . explode(' ',(range("0","9")));
$pass = "";
for($i = 0; $i < $len; $i += 1){


But the randomize method is not returning desired result.

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Nov 14, 2006

suggest a way that I can strip a valid IP out of a random string? e.g.

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I'm trying to strip IP addresses out of Received: tags in email headers.

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Oct 26, 2010

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choose number between 0,1,2,3,4,5 randomly
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Mar 14, 2011

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Oct 17, 2010

I need to generate a string using PHP, it need to be unique and need to be from 4 to 8 characters (the value of a variable).

I thought I can use crc32 hash but I can't decide how many characters, but sure it will be unique. In the other hand only create a "password generator" will generate duplicated string and checking the value in the table for each string will take a while.

Maybe I can use that :

function unique_id(){
$better_token = md5(uniqid(rand(), true));
$unique_code = substr($better_token, 16);
$uniqueid = $unique_code;
return $uniqueid;


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