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

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Generating Random (alphanumeric) String?

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function randomPrefix($length)
{
$random= "";
srand((double)microtime()*1000000);
$data = "AbcDE123IJKLMN67QRSTUVWXYZ";
$data .= "aBCdefghijklmn123opq45rs67tuv89wxyz";
$data .= "0FGH45OP89";
[Code]....

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$string = "This string is ok";
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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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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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Quick @# brown fox -
Quick @# brown fox##
Quick @# brown fox
Quick @# brown fox @$#

all become

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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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a
b
c
d
..
x
y
z
aa
ab
ac
ad
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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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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.

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Example:
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I guess you all know what I am after.

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PHP Code:
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echo "A match was found.";
} else {
echo "A match was not found.";
}
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boo * test => boo-test
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[code]...

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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