random lettering question

[chris_rulez001]

hi, in php, how can you make a random code and then changes each time you submit a form?

 

by a random code i mean:

 

1hak723isba92821k9

 

the random code has to be 18 characters long.

[lemmin]

You can use the rand() function and specify a minimum and a maximum making the range in the characters you want. If you want lower case letters, you can use:

 

for ($i=0;$i<18;$i++)
echo chr(rand(97, 122));

 

If you want more than just lower case letters, mess around with the min and max.

[chris_rulez001]

You can use the rand() function and specify a minimum and a maximum making the range in the characters you want. If you want lower case letters, you can use:

 

for ($i=0;$i<18;$i++)
echo chr(rand(97, 122));

 

If you want more than just lower case letters, mess around with the min and max.

 

thanks

[Orio]

There are various ways doing that, I think I would use:

 

<?php

$random = str_shuffle("abcdefghijklmnopqrstuvwxyz1234567890");
$random = substr($random, 0, 18);

?>

 

 

Orio.

[cooldude832]

Generate a random number in the ASCII translation area of your choice and apply it to the chr() function

http://us3.php.net/manual/en/function.chr.php

i.e

<?php
$codelength = 15;
$i = 1;
$string = "";
while($i<=$codelength){
$type = rand(1,3);
switch ($type){
//Number
case 1:
$string .= chr(rand(48,57));
break;
//Upper Case Letter
case 2:
$string .= chr(rand(65,90));
break;
//Lower Case Letter
default:
$string .= chr(rand(97,122));
}
$i++;
}
//$string is now a 15 character long random combo of numbers, uppercase, lowercase letters/numbers
echo $string;