How get a array with random values without ....

[whisher06]

Hi.
I've got this simple function:

<?php 
function getRandom($length,$max)
{
	$random = array();
	for($i=0;$i<$length;$i++)
	{
		$random[]= mt_rand(0,$max);
	}
	return $random;
}
print_r(getRandom(5,32));
?>

But as you can image sometime it
returns a array with double values.
How can I get a array without double
values ?

Take care.

[void_function]

You'll have to check if a random value already exists in teh array (in_array() ), and if it does, simply recalculate. Though, statistically, you're bound to get double values for lower ratios of length vs max.

[devinemke]

function getRandom($length, $max) 
{ 
	$array = range(0, $max);
	shuffle($array); 
	$array = array_slice($array, 0, $length); 
	return $array;
}

[whisher06]

You'll have to check if a random value already exists in teh array (in_array() ), and if it does, simply recalculate. Though, statistically, you're bound to get double values for lower ratios of length vs max.

Just tried but it doesn't work very well.
The devinemke function works better
(I couldn't be pleased with it) but it
fails I think 1 out of 10 (I made with it
only a tinyl test 😃 )
Thanks a lot buddies.

Bye.

[whisher06]

What for ?

<?php 
session_start();
function fakeCaptcha($seed)
{
	$random = getRandom(5,32);
	$captcha = "";
	$string = "";
  	for($i=0;$i<strlen($seed);$i++) 
	{
		if(in_array($i,$random))
		{	
			$captcha .=	$seed[$i];
			$string .= "<span style=\"color:red\">".$seed[$i]."</span>";
		}
		else
		{
		 	$string .= $seed[$i];
		}
  	}
	return array($captcha,$string);
}
function getRandom($length, $max)
{
    $array = range(0, $max);
    shuffle($array);
    $array = array_slice($array, 0, $length);
    return $array;
} 
?>
<?php
if(!isset($_SESSION['captcha']))
{
	$captcha = fakeCaptcha(md5(time())); 
	$_SESSION['captcha'] = $captcha[0];
	$_SESSION['string'] = $captcha[1];
}
if(isset($_POST['captcha']))
{
	if($_POST['captcha']==$_SESSION['captcha'])
	{
		echo "Good user ;) ";
	}
	else
	{
		echo "Are you a robot ;( ";
	}
}
?>
<p>Fill in the form with the red letter</p>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" name="frm">
<p><?php echo $_SESSION['string']; ?></p>
<input name="captcha" type="text" value="" maxlength="5"><br />
<input name="test" type="submit" value="Test">
</form>

[void_function]

Too complex. 😉

Try this:

function getRandStr($len) {

$str= '';
for ($i=0; $i<$len; $i++) {
	$seed= rand (0, 2);
	switch ($seed) {
		case 0: $str.= rand (0, 9); break;
		case 1: $str.= chr(rand(0, 25)+65); break;
		case 2:
		default: $str.= chr(rand(0, 25)+97); break;	
	}
}

return $str;	
}