generate random set of values from array

Question

i want to get static length to get any random value from array.

PHP CODE:

in this below code how to get 5 random value from array?

$arr_history = array(23, 44,24,1,345,24,345,34,4,35,325,34,45,6457,57,12);
$lenght=5;
for ( $i = 1; $i < $lenght; $i++ )
     echo array_rand($arr_history);

Shuffle and slice or pass 5 as second argument to array_rand. php.net/manual/en/function.array-rand.php. — Felix Kling
– Felix Kling, Commented Feb 20, 2013 at 10:19
shuffle($array); array_slice($array, 0, 5); //Implementation of Felix Kling's comment ;) — Leri
– Leri, Commented Feb 20, 2013 at 10:22
@FelixKling Passing 5 as 2nd argument to array_rand() returns an array of keys, not values :) — Ja͢ck
– Ja͢ck, Commented Feb 20, 2013 at 10:26
@Jack: array_rand always returns a key or keys :) And why would that be a problem? The docs say: "This is done so that you can pick random keys as well as values out of the array.". edit: I see you created a proper answer. I think I slightly misunderstood your comment, but it's all good now :) — Felix Kling
– Felix Kling, Commented Feb 20, 2013 at 10:27
@FelixKling You can tell I use that function on a daily basis .. ahem :) — Ja͢ck
– Ja͢ck, Commented Feb 20, 2013 at 10:29

Ja͢ck · Accepted Answer · 2013-02-20 10:31:51Z

2

You can use array_rand() to pick 5 random keys and then use those to intersect with the array keys; this keeps the original array intact.

$values = array_intersect_key($arr_history, array_flip(array_rand($arr_history, 5)));

Demo

Alternatively, you can first shuffle the array in-place and then take the first or last 5 entries out:

shuffle($arr_history);
$values = array_slice($arr_history, -5);

This has the advantage that you can take multiple sets out consecutively without overlaps.

edited Feb 20, 2013 at 10:31

answered Feb 20, 2013 at 10:23

Ja͢ck

174k39 gold badges269 silver badges316 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

DolDurma Over a year ago

thats return static values in every refresh page

Prasanth Bendra · Accepted Answer · 2013-02-20 10:20:18Z

0

Try this :

$rand_value = array_rand($arr_history);

echo $rand_value;

REF: http://php.net/manual/en/function.array-rand.php

OR use :

shuffle($arr_history)

This will shuffle the order of the array : http://php.net/manual/en/function.shuffle.php

answered Feb 20, 2013 at 10:20

Prasanth Bendra

33.1k9 gold badges56 silver badges74 bronze badges

Collectives™ on Stack Overflow

generate random set of values from array

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related