problem with array_rand

[r3wt]

I'm not sure why but i'm having problem with array rand. I made the following script to test out a real time price update over websockets, to see how it looks visually when the prices are updating and debug/fine tune the client side of the price updates.  so i decided i'd use array rand to select a value at random and insert it into the two test markets last_price field. the problem is, for some reason it is inserting the numeric key instead of the value. this is the first time i've used array rand, and i was wondering if someone could explain to me what i did wrong here. thanks

require_once __DIR__ . '/models/config.php';

for($i = 0; $i < 20; $i++) {
	$prices = array('0.00321252','0.00223252','0.00121252','0.00301272','0.00091252','0.00001252','0.00005252','0.00007252');
	$price1 = array_rand($prices);
	$price2 = array_rand($prices);
	$coin1  = 'TST-BTC';
	$coin2  = 'TST-LTC';
	global $mysqli;
	$stmt = $mysqli->prepare("UPDATE uc_market_data SET last_price = ? WHERE pair = ?");
	$stmt->bind_param('ss',$price1,$coin1);
	$stmt->execute();
	$stmt->close();
	$stmt = $mysqli->prepare("UPDATE uc_market_data SET last_price = ? WHERE pair = ?");
	$stmt->bind_param('ss',$price2,$coin2);
	$stmt->execute();
	$stmt->close();
	sleep(1);
}

[r3wt]

Looks like i posted this in the wrong forum. My apologies to the mods, my mistake.

[requinix]

When in doubt, check the documentation.

mixed array_rand ( array $array [, int $num = 1 ] )

 

Picks one or more random entries out of an array, and returns the key (or keys) of the random entries.

So

$price1 = $prices[array_rand($prices)];
$price2 = $prices[array_rand($prices)];

[r3wt]

oh, so array rand only selects the key. that's counter intuitive imo. thanks requinix