how to bind the value of a variable to another variable in php

Question

I have 3 arrays:

$q1 = ['A', 'B', 'C', 'D'];
$q2 = ['E', 'F', 'G', 'H'];
$q3 = ['I', J', 'K', 'L'];

When i click on submit in a form, i store a session and everytime i click on next, the session will increment with 1

session_start();
if(!isset($_SESSION['i']))  {
    $_SESSION['i'] = 0;
}
if(isset($_POST['next'])){
    $_SESSION['i']++;       
}

$session = $_SESSION['i'];
echo $session;

Now i want to bind the value of the session to the variable $q

So after 1 submit, $q must become $q1, after second submit; $q must become $q2 and so on...

So everytime i submit, the value of the session must be bind to $q, so that i can read different arrays.

(I want to use this for creating a dynamic form:)

foreach ($q as $key => $value) {
...

How can i do that?

u_mulder · Accepted Answer · 2020-01-11 10:55:27Z

2

Instead of variables - use array:

// I use explicit indexing, as you start with `i = 1`
$q = [
    1 => ['A', 'B', 'C', 'D'],
    2 => ['E', 'F', 'G', 'H'],
    3 => ['I', 'J', 'K', 'L'],
];

$_SESSION['i'] = 3;
print_r($q[$_SESSSION['i']]);

answered Jan 11, 2020 at 10:55

u_mulder

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Comments

davidev · Accepted Answer · 2020-01-11 11:00:28Z

1

Your code already looks fine and almost done.

So I use another array, which stores all your other arrays.

If you now get your $session variable, you can access the wrapper array and get your specific array you want. As you started your array names with 1, but arrays getting called with starting index 1, you have to subtract - 1.

$q1 = array('A', 'B', 'C', 'D');
$q2 = array('E', 'F', 'G', 'H');
$q3 = array('I', 'J', 'K', 'L');

$wrapper = array($q1, $q2, $q3);

$session = 2;

foreach ($wrapper[$session-1] as $key) {
 //Will output E, F , G H as session is =2
 echo $key;

}

answered Jan 11, 2020 at 11:00

davidev

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ash__939 · Accepted Answer · 2020-01-11 11:14:24Z

1

Recommended

You can use PHP array to do this.

$arr = [
    1 => ['A', 'B', 'C', 'D'],
    2 => ['E', 'F', 'G', 'H'],
    3 => ['I', J', 'K', 'L'],
];

then, access it like:


print_r($arr[$_SESSION['i']]);

Not ready to use Arrays?Well, PHP also allows you to use dynamic variable names, called Variable variables.

$variableName = "q";
//..... Update the value of i in session.

 $variableName .= $_SESSION['i'];// when i = 1, it becomes q1;

 print_r($$variableName); // notice the $$ in the Variable Name
 // output
 // Array (0 => 'A', 1 => 'B', 2 => 'C', 3 => 'D')

Read more about Variable Variables here https://www.php.net/manual/en/language.variables.variable.php

answered Jan 11, 2020 at 11:14

ash__939

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