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How do you use sessions so that an array becomes the new array when page refreshes?


JonDecagon
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I'm trying to create a code that moves a string array A B C D E around based on the amount specified entered into a field in a form and the direction which is also entered into the form. What I want to do is to make the $newarray equal $array when the page is refreshed and the submit button is hit again. That way A B C D E when moved LEFT by 1 will be B C D E A and then if RIGHT and 2 is entered, you will see E A B C D. I've been struggling to get session working and just ended up more lost. Here is the code I got so far. I would greatly appreciate any help with this.

<html>
    
   
<div style="border:1px solid black;font-weight:bold;">
     <div style="border:none;">A B C D E</div>
    
    <form method="POST">
        <input type="text" name="thebutton"/>      
    
     <input type="text" name="offset"/>
    
        <input type="submit" value="SUBMIT"/>
           
    
    </form>
    
    </div>
       
<?php
session_start();
 
if (isset($_POST["offset"], $_POST["thebutton"])) {
 
$shift=$_POST["offset"];
$direction=$_POST["thebutton"];
$counter=0;
$array=array('A','B','C','D','E'); 
 
 
if ($direction=="LEFT"){
    for($i=$shift; $counter+$shift<5; $i++,$counter++){
       
        $newarray[$counter]=$array[$counter+$shift];
       
        
    }
    
for($j=0; $j<$shift; $j++){
        $newarray[$counter + $j]=$array[$j];
       
    }
    
}
if ($direction=="RIGHT"){
    for($counter=0,$k=5-$shift; $counter<$shift; $counter++){
       
        $newarray[$counter]=$array[$counter+$k];
       
        
    }
    
for($j=0; $j<5-$shift; $j++){
        $newarray[$counter + $j]=$array[$j];
       
    }
    
}
 
 
echo $newarray[0];
echo $newarray[1];
echo $newarray[2];
echo $newarray[3];
echo $newarray[4];
 
 
 
?>       </html>
 
 
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1. You can't session_start() if there has been any output. Move that to the very top of the script.

2. If you want to remember the values (and want to use the session for it) then you actually have to put the array into the session.

 

The logic for #2 is simple: if there is an array in $_SESSION already then use that, otherwise use the default ABCDE array. Manipulate that array however you want, then put it back into $_SESSION.

 

Give that a shot. If you have problems, post your new code.

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