Select random values from array

Question

I need 9 unique random numbers between 0 and 44. I create an array with range to add numbers between 0 and 44 and then I use shuffle like this:

$buildingIdArray  = array();
$numbers = range (0, $maxNumberOfBuildings);
shuffle($numbers);

I need some help to complete the code. I want to pick the 9 numbers by the arrays index, should I just use a loop to get the numbers of the index between 0 and 8 or should i use slice to pick numbers and then remove that index?

I want to add the 9 unique numbers in the array $buildingIdArray. Any idea how to solve this?

IanPudney · Accepted Answer · 2013-06-12 19:00:43Z

2

array_slice() is a good choice in this application.

$buildingIdArray  = array();
$numbers = range (0, $maxNumberOfBuildings);
shuffle($numbers);
$buildingIdArray=array_slice ($numbers,0,9);

edited Jun 12, 2013 at 19:00

answered Jun 12, 2013 at 16:29

IanPudney

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3 Comments

3D-kreativ Over a year ago

Thanks, but I have some problems with the code! It's not working! Please have a look at my other question: stackoverflow.com/questions/17071881/loop-mysql-result

3D-kreativ Over a year ago

I found the error now! In line 4 there is a ';' missing!!! I copied the code above, and since there was no ';' it didn't work!

IanPudney Over a year ago

I see. I've added a semicolon to the end of the line.

RTB · Accepted Answer · 2013-06-12 16:34:13Z

1

If you are picking only one entry, array_rand() returns the key for a random entry. Otherwise, it returns an array of keys for the random entries. This is done so that you can pick random keys as well as values out of the array.

$rand_key = array_rand($buildingIdArray);
echo $buildingIdArray[$rand_key] . "\n";

edited Jun 12, 2013 at 16:34

answered Jun 12, 2013 at 16:27

RTB

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Comments

RST · Accepted Answer · 2013-06-12 16:38:29Z

1

$buildingIdArray  = array();
$numbers = range (0, $maxNumberOfBuildings);
shuffle($numbers);
for($i=0;$i<9;$i++) {
    $buildingIdArray[] = $numbers[$i];
}

edited Jun 12, 2013 at 16:38

answered Jun 12, 2013 at 16:30

RST

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2 Comments

Deleteman Over a year ago

It should be $buildingIdArray[] = $number[$i], php's arrays are not really objects, are they?

RST Over a year ago

Yep you are right. Been working with objects all day today :)

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