Generate a series of random no

[Jacks89]

I need advice in generating a set of random number without it repeating. I got the result I desire with my code but I am wondering if there is an easy method of doing it.

 

This is my code

<?php
$row = 1;
while( $row<=100){
echo "<tr><td>".$row."</td>";
	$a= rand(1,45);
	$b= rand(1,45);
	$c= rand(1,45);
	$d= rand(1,45);
	$e= rand(1,45);
	$f= rand(1,45);
	$g= rand(1,45);
	$h= rand(1,45);
	$i= rand(1,45);
	$j= rand(1,45);
	$k= rand(1,45);
	$l= rand(1,45);

	//for b
	while ($b==$a){
		$b=rand(1,45);
		$b!=$a;
	}

	//for c
	while ($c==$a OR $c==$b){
		$c=rand(1,45);
		$c!=$a;	$c!=$b;
	}

	//for d
	while ($d==$a OR $d==$b OR $d==$c){
		$d=rand(1,45);
		$d!=$a;	$d!=$b;	$d!=$c;		
	}

	//for e
	while ($e==$a OR $e==$b OR $e==$c OR $e==$d){
		$e=rand(1,45);
		$e!=$a;	$e!=$b;	$e!=$c;	$e!=$d;
	}

	//for f
	while ($f==$a OR $f==$b OR $f==$c OR $f==$d OR $f==$e){
		$f=rand(1,45);
		$f!=$a;	$f!=$b;	$f!=$c;	$f!=$d;	$f!=$e;
	}

	//for g
	while ($g==$a OR $g==$b OR $g==$c OR $g==$d OR $g==$e OR $g==$f){
		$g=rand(1,45);
		$g!=$a;	$g!=$b;	$g!=$c;	$g!=$d;	$g!=$e;	$g!=$f;
	}

	//for h
	while ($h==$a OR $h==$b OR $h==$c OR $h==$d OR $h==$e OR $h==$f OR $h==$g){
		$h=rand(1,45);
		$h!=$a;	$h!=$b;	$h!=$c;	$h!=$d;	$h!=$e;	$h!=$f;	$h!=$g;
	}

	//for i
	while ($i==$a OR $i==$b OR $i==$c OR $i==$d OR $i==$e OR $i==$f OR $i==$g OR $i==$h){
		$i=rand(1,45);
		$i!=$a;	$i!=$b;	$i!=$c;	$i!=$d;	$i!=$e;	$i!=$f;	$i!=$g;	$i!=$h;		
	}

	//for j
	while ($j==$a OR $j==$b OR $j==$c OR $j==$d OR $j==$e OR $j==$f OR $j==$g OR $j==$h OR $j==$i){
		$j=rand(1,45);
		$j!=$a;	$j!=$b;	$j!=$c;	$j!=$d;	$j!=$e;	$j!=$f;	$j!=$g;	$j!=$h;	$j!=$i;
	}

	//for k
	while ($k==$a OR $k==$b OR $k==$c OR $k==$d OR $k==$e OR $k==$f OR $k==$g OR $k==$h OR $k==$i OR $k==$j){
		$k=rand(1,45);
		$k!=$a;	$k!=$b;	$k!=$c;	$k!=$d;	$k!=$e;	$k!=$f;	$k!=$g;	$k!=$h;	$k!=$i;	$k!=$j;	
	}

	//for l
	while ($l==$a OR $l==$b OR $l==$c OR $l==$d OR $l==$e OR $l==$f OR $l==$g OR $l==$h OR $l==$i OR $l==$j OR $l==$k){
		$l=rand(1,45);
		$l!=$a;	$l!=$b;	$l!=$c;	$l!=$d;	$l!=$e;	$l!=$f;	$l!=$g;	$l!=$h;	$l!=$i;	$l!=$j;	$l!=$k;
	}

	$no=  array( $a, $b , $c, $d, $e, $f , $g, $h, $i, $j, $k, $l );
	sort($no);
		foreach ($no as $key => $val) {
		echo "<td>".$val."</td> ";
		}
echo "</tr>";
$row++;
}
?>

 

The current code that I have actually do not have much problem for generating 100 set of number of 12.. But the more I generate (usually up to 4 time), my browsers start to get very slow.

[Daniel0]

Like this?

 

$numbers = array();
for ($i = 0; $i < 12; ++$i) {
$number = mt_rand(1, 45); // mt_rand() is approximately four times faster than rand()

if (!in_array($number, $numbers)) {
	$numbers[] = $number;
}
else {
	--$i;
}
}

[Mark Baker]

$possibleValues = range(1,45);
shuffle($possibleValues);
$actualValues = array_slice($possibleValues,0,12);