Php > Miscellaneous

Multiple Unique Random Numbers

Multiple Unique Random Numbers

<?php 

# Multiple Unique Random Numbers 
# 
# array mrand ( int min, int max, int count [, int strlen ] ) 

function mrand($l,$h,$t,$len=false){ 
if($l>$h){$a=$l;$b=$h;$h=$a;$l=$b;} 
if( (($h-$l)+1)<$t || $t<=0 )return false; 

    $n = array(); 

if($len>0){ 

    if(strlen($h)<$len && strlen($l)<$len)return false; 
    if(strlen($h-1)<$len && strlen($l-1)<$len && $t>1)return false; 

    do{ 

    $x = rand($l,$h); 

    if(!in_array($x,$n) && strlen($x) == $len)$n[] = $x; 

    }while(count($n)<$t); 

}else{ 

    do{ 
         
    $x = rand($l,$h); 

    if(!in_array($x,$n))$n[] = $x; 

    }while(count($n)<$t); 
     
} 

return $n; 
} 


## Samples ## 

if(!$numbers = mrand(1000,9999,10,4))die("error"); 

// 20 random, all 7 chars in length 
# $numbers = mrand(0,9999999,20,7); 

// 20 random, length doesn't matter 
# $numbers = mrand(0,9999999,20); 

# $numbers = mrand(8000,10000,1,5) // ok 
# $numbers = mrand(8000,10000,2,5) // error 

# $numbers = mrand(120,100,20);  // ok 
# $numbers = mrand(100,120,21);  // ok 
# $numbers = mrand(120,100,21);  // ok 
# $numbers = mrand(120,100,22);  // error 
# $numbers = mrand(100,120,22);  // error 
# $numbers = mrand(120,120,1); // ok 
# $numbers = mrand(120,120,2); // error 
# $numbers = mrand(120,120,0); // error 

# $numbers = mrand(1000000,9999999,3000); 

// Sort the array 
# sort($numbers); 

// Display the array 
echo '<pre>'; 
print_r($number); 
echo '</pre>'; 

?>