Generating 9 random digits exactly

[graham23s]

Hi Guys,

 

I'm trying to generate 9 random digits, i have done rand(0, 999999999) but i was wanting the script to generate 9 random digits exactly not 8 or 7 but consistantly 9 i cant think of a way to dfo ity lol

 

any help would be great

 

thanks guys

 

Graham

[aeroswat]

Hi Guys,

 

I'm trying to generate 9 random digits, i have done rand(0, 999999999) but i was wanting the script to generate 9 random digits exactly not 8 or 7 but consistantly 9 i cant think of a way to dfo ity lol

 

any help would be great

 

thanks guys

 

Graham

 

Why not generate each one seperately then add them to a string and convert that string if you need to do math functions on it?

[wildteen88]

Use  rand within a for loop.

$length = 9;
$numb = null;
for($i = 0; $i < $length; $i++)
{
     $numb .= rand(0,9);
}
echo $numb;

[Psycho]

This should be a little more efficient:

$randNum = sprintf("%09s",   rand(0, 999999999));

[roopurt18]

And another way!

 

<?php

echo randdigits( 9 ) . "\n";
echo randdigits( 9 ) . "\n";
echo randdigits( 9 ) . "\n";
echo randdigits( 9 ) . "\n";
echo randdigits( 9 ) . "\n";
echo randdigits( 9 ) . "\n";
echo randdigits( 9 ) . "\n";
echo randdigits( 9 ) . "\n";


/**
* Generates $n random digits
* 
* @param int $n
*/
function randdigits( $n ) {
    if( ! is_int( $n ) || $n < 1 ) return false;
    
    $v = 0;
    for( $i = 0; $i < $n; $i += 1 ) {
        $v = ($v * 10) + rand(0,9);
    }
    return $v;
}
?>

[akitchin]

or:

 

rand(100000000, 999999999);

[Psycho]

or:

 

rand(100000000, 999999999);

 

But that excludes some valid possibilities, e.g. 001001001. however, that may or may not be an issue for the OP.

[akitchin]

ah, yes. good point.