How To Submit A Single Form Value Multiple Times And Store (preserve) Them In An Array Each Time That I Refresh My Page?

Attempt 1: This shows what I want to achieve. The same array but different key and value pair.When printed, it list out all the keys and values.

Solution 1:

You can use session to achieve what you want, see this code:

<?php  
session_start();

if(isset($_POST['days']) && isset($_POST['rental'])){        

$_SESSION['info'][] = array($_POST['days'] => $_POST['rental']);

}

if(isset($_SESSION['info'])) {
for($i = 0; $i < count($_SESSION['info']); $i++) {
  foreach($_SESSION['info'][$i] as $days => $rental){
    echo '<p>' . $days . '<br>';
    echo $rental . '</p>';
 }
} 
}
?>

<form action="#" method="post">
   Number of Days: <input type="text" name="days" value=""><br/>
   Rental rate: <input type="text" name="rental" value=""><br/>
   <input type="submit" name="add_rental_rate" value="Add Rental Rate">
</form>

You should read some docs about session:

http://php.net/manual/en/intro.session.php