随机函数的php值在页面刷新后保持不变

Question

is there a way that when I use the random function to get a list of random strings to display, it will stay even after i refreshed the page?

Such as this code:

session_start();
$a = array("red","green","blue","yellow","brown");


if ( ! isset($_SESSION['rand_val']) ) {
     $_SESSION['rand_val'] = array_rand(array_flip($a)); 
}
try{
        $db = $conn->prepare("Select Column from Table where `xColumn` = XX");
        $db->execute();

        while($row=$db->fetch(PDO::FETCH_OBJ)) { 
       //if returned 5 values from DB, then randomly generate 5 values.

            echo $row->Column, "<br>";

            echo ($_SESSION['rand_val']), "<br>";
        }


} catch (PDOException $e) {
        echo "Error: ".$e;
    }

It only get the first value from the array and store into the session.

Answer 1

Solution:

session_start();

$a = array("red","green","blue","yellow","brown");

if ( ! isset($_SESSION['rand_val']) ) {
    $_SESSION['rand_val'] = array_rand(array_flip($a));
}


echo $_SESSION['rand_val']; // green (or other values in array)

If you want multiple items:

session_start();

$a = array("red","green","blue","yellow","brown");

if ( ! isset($_SESSION['rand_val']) ) {
    $_SESSION['rand_val'] = array_rand(array_flip($a), 2); // Specify how many random value you want from array
}


print_r($_SESSION['rand_val']); // Array ( [0] => blue [1] => yellow )