Random Number generator with Prefix

Hi,

I assume what I am trying to do is easy, I just have no idea what the code would be??

I need to generate some numbers (50,000 of them to be exact)

Here are the specifications:

- Add a Prefix to the numbers - A#####
- Be 6 digits long (including prefix, so 5 numbers)
- All be unique
-Display as a standard list (plain text with return breaks)

Is there a PHP snippet I could use to generate this list. I only need to use it once, any help would be much appreciated!!!

EXAMPLE:

A83754
A28475
A90982
A33382

 

<?php
do
{
        $num = "A" .rand(10000,99999);
        if(@$list[$num]) continue;
        $list[$num] = $num;
        if(count($list) > 50000)
        break;
} while(1);
foreach($list as $k => $num)
        echo "$k\n";

Code (markup):

 

Hopefully this will help.

 

Hi,
I've made this snippet for you:

<?php
function series($limit, $prefix='A', $len=5, $print = true) 
{
	if($limit <= 0) {
		echo 'You must set limit!';
		return;
	}
	$lower = floatval('1'.str_repeat('0',$len-1));
	$upper = floatval('1'.str_repeat('0',$len))-1;
	$series = array();
	while(count($series) < $limit) {
		$num = $prefix.rand($lower, $upper);
		if(!isset($series[$num])) {
			$series[$num] = $num;
		}
	}
	$series = array_keys($series);
	if(!$print) {
		return $series;
	} else {
		foreach($series as $str) {
			echo $str, "\n";
		}
	}
}

// usage:
series(50000, 'A', 5);
// or 
series(50000);

PHP:

Hope it works as you needed.

 

Here's what I use for generating random numbers. Just loop though 50,000 times and echo the output.

function random_string($length=5, $current_array=array(), $prefix='A')
{
    $string = '';
    $possible = '0123456789';

    for ($i = 1; $i <= $length; $i++) {
        $char = substr($possible, mt_rand(0, strlen($possible) - 1), 1);
        $string .= $char;
    }

    if (!in_array($prefix . $string, $current_array)) {
        return $prefix . $string;
    } else {
        return random_string(5, $current_array);
    }
}

$current_array = array();

for ($i = 1; $i <= 50000; $i++) {
    $current_array[] = random_string(5,$current_array);
}

echo implode("<br />", $current_array);

PHP:

 

thanks everyone!!