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Re: Random function [message #180551 is a reply to message #180544]

Mon, 25 February 2013 22:42

Salvatore
Messages: 38
Registered: September 2012

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Member

On 2013-02-25, sonnichjensen(at)gmail(dot)com <sonnichjensen(at)gmail(dot)com> wrote:
> I use the rand function to get 10 items of 1808 current itemes.

If you want ten random items from an array, you could try the following:

<?php
// This is the big array you're pulling something out of.
$lotsOfItems = array( /* ... */ );

// This is the empty array that will eventually contain the ten random
// items.
$tenRandomItems = array();

// Generate a range of numbers between 0 and the number of items minus
// one.
$range = range(0, count($lotsOfItems) - 1);

// Shuffle the array of numbers.
shuffle($range);

while (count($tenRandomItems) < 10) {
$randomOffset = array_shift($range);
$tenRandomItems []= $lotsOfItems[$randomOffset];
}
?>

Using this code, you will never, ever have a duplicate item. However, it
will be far more computationally expensive than using rand() or
mt_rand().

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[Message index]

		Random function By: Sonnich Jensen on Mon, 25 February 2013 20:48
		Re: Random function By: Salvatore on Mon, 25 February 2013 20:57
		Re: Random function By: Luuk on Mon, 25 February 2013 21:13
		Re: Random function By: Jerry Stuckle on Mon, 25 February 2013 21:42
		Re: Random function By: The Natural Philosoph on Mon, 25 February 2013 22:12
		Re: Random function By: Robert Heller on Tue, 26 February 2013 01:46
		Re: Random function By: Jerry Stuckle on Mon, 25 February 2013 21:39
		Re: Random function By: The Natural Philosoph on Mon, 25 February 2013 22:11
		Re: Random function By: Salvatore on Mon, 25 February 2013 22:42
		Re: Random function By: M. Strobel on Tue, 26 February 2013 10:18
		Re: Random function By: Paul Herber on Tue, 26 February 2013 13:52
		Re: Random function By: Markus Grob on Wed, 27 February 2013 11:17
		Re: Random function By: Thomas 'PointedEars' on Wed, 27 February 2013 23:22

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