CODEWITHSUNDEEP
phprandom
pepe
pepe

Reputation: 9909

How to choose 1 random number from 2 different number ranges?

I need to get a random number that is between

0 - 80

and

120 - 200

I can do

$n1 = rand(0, 80);
$n2 = rand(120, 200);

But then I need to choose between n1 and n2. Cannot do 

 $n3 = rand($n1, $n2)

as this may give me a number between 80 - 120 which I need to avoid.

How to solve this?

Upvotes: 5

Views: 5215

Answers (4)

japetko
japetko

Reputation: 358

get two random numbers $n1 and $n2

$n1 = rand(0, 80);
$n2 = rand(120, 200);

define new array called $n3

$n3=array();

add $n1 and $n2 into array $n3 use array_push() function

array_push($n3,$n1,$n2);

use array_rand() function to find random index $find_index from array $n3.

$find_index=array_rand($n3,1);

show the result

echo $n3[$find_index];

Upvotes: 1

Ninjakreborn
Ninjakreborn

Reputation: 219

PHP has a new function for this as well called range. Very easy to use, and can be located in the PHP Manual.

It allows you to input a minimum/maximum number to grab a range from.

<?php
echo range(0, 1000);
?

Technically though, you could also enter your own two numbers to serve as the number range.

Upvotes: 1

DanRedux
DanRedux

Reputation: 9349

Since both ranges have different sizes (even if only by 1 number), to ensure good random spread, you need to do this:

$random = rand( 0, 200 - 39 );
if ($random>=120-39) $random+=39;

Fastest method. :)

The way this works is by pretending it's a single range, and if it ends up picking a number above the first range, we increase it to fit within the second range. This ensures perfect spread.

Upvotes: 8

ThiefMaster
ThiefMaster

Reputation: 318518

Since both ranges have the same size you can simply use rand(0, 1) to determine which range to use.

$n = rand(0, 1) ? rand(0, 80) : rand(120, 200);

Upvotes: 5

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