Choosing random data from an array (PHP)?

Question

I wrote some code that works fine and uses a for statement to iterate over the array and display the eight results like I want it to.

$Address = $RPC2->getaddressesbyaccount($_SESSION['email']); 
$iteration_addresses = 0;

    foreach($Address as $Another) {
        $iteration_addresses++;
        echo '<b>' . $Another . '</b><br /><br />';
        if($iteration_addresses == 8) break;
    }

But it usually chooses the same 8 results, how can I have it choose random results each AJAX call?

Is this what you looking for php.net/manual/en/function.array-rand.php — VishwaKumar
– VishwaKumar, Commented Nov 15, 2013 at 6:32

Hanky Panky · Accepted Answer · 2013-11-15 06:32:56Z

1

Just shuffle() your array before you pick up entries.

This function shuffles (randomizes the order of the elements in) an array.

$Address = $RPC2->getaddressesbyaccount($_SESSION['email']); 
shuffle($Address); // Here
$iteration_addresses = 0;

    foreach($Address as $Another) {
        $iteration_addresses++;
        echo '<b>' . $Another . '</b><br /><br />';
        if($iteration_addresses == 8) break;
    }

Fiddle (taken from PHP.net)

answered Nov 15, 2013 at 6:32

Hanky Panky

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3 Comments

user2967388 Over a year ago

Works like a charm. Thanks. Also, I have another array of "transactions" if you will, and it's descending from oldest to newest when I want it newest to oldest, how can I flip it via timestamp? $Transactions = $RPC2->listtransactions($_SESSION['email']); foreach($Transactions as $Transaction) { echo '<tr>'; echo '<td>' . date("F j, g:i A", $Transaction['timereceived']) . '</td>'; echo '<td>' . $Transaction['address'] . '</td>'; echo '<td>' . $Transaction['amount'] . '</td>'; }

user2967388 Over a year ago

I did a sort() around the $Transactions var and it didn't change anything.

user2967388 Over a year ago

How can I order them by which timestamp is greatest?

sharif2008 · Accepted Answer · 2013-11-15 06:40:53Z

0

You can simply get exactly 8 randoms variables by your SQL QUERY like this:-

SELECT column FROM table
WHERE email='Your_email'
ORDER BY RAND()
LIMIT 8

I think this is CI framework then implement your model function like this

function getaddressesbyaccount($email)
{
   $this->db->order_by('address', 'RANDOM');
   $this->db->limit(8);
   $this->db->where(array('email'=>$email));
   $query = $this->db->get('table_name');
   return $query->result_array();
}

Then you can use this functions in your ajax implementations. Thanks.

answered Nov 15, 2013 at 6:40

sharif2008

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