Access the name the variables in an (indexed) array in a loop

Question

i am writing a php code that loops an array of variables using foreach and I am trying to get the name of variable to use it in the javascript code here's my code

$arr = array($devices1, $devices2, $devices3, $devices4, $devices5, $devices6);
    foreach ($arr as $key => $value)
    {
        if($value == '1')
        {
            echo "
        <script type=\"text/javascript\">
        document.getElementById($key).checked = true;
        </script>
    ";
        }
    }

when i run the code, $key takes values 0,1,2 what i need is to take devices1, devices2, devices3... so the names of the variables. Can anyone help me out?

When i see devices4 .... n times there is already a chance that this could be written better — Ryan
– Ryan, Commented Sep 11, 2014 at 20:34
Sidenote: checked == true; should most likely be checked = true; — Funk Forty Niner
– Funk Forty Niner, Commented Sep 11, 2014 at 20:35
thats for the sake of the question, i just need to know how can i tell php to take the variable name not the values or indexes @true — Jad Daoud
– Jad Daoud, Commented Sep 11, 2014 at 20:35

Shomz · Accepted Answer · 2014-09-11 20:42:29Z

2

Well, you can build the names your self ("devices" + ($key+1)) or make it an associative array (~~though it doesn't make much sense~~):

$arr = array('devices1'=>$devices1,'devices2'=>$devices2,'devices3'=>$devices3);// etc...

However, what makes the most sense is to use a simple string array:

$arr = array('devices1', 'devices2', 'devices3', 'devices4', 'devices5', 'devices6');

and then just use $value instead of $key in your JS snippet.

UPDATE

Here's how to use the associative array version:

FULL CODE

$arr = array('devices1'=>$devices1,'devices2'=>$devices2,'devices3'=>$devices3);
foreach ($arr as $key => $value)
{
    if($value == '1') // $value will be the value of each array item
    {
        echo "
    <script type=\"text/javascript\">
    document.getElementById($key).checked = true; // and $key is the string key
    </script>                                     // like 'devices1', etc.
";
    }
}

edited Sep 11, 2014 at 20:42

answered Sep 11, 2014 at 20:35

Shomz

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7 Comments

Jad Daoud Over a year ago

but if i do this, i will loose the values stored in it no?

Barmar Over a year ago

You're not doing anything with the values.

Shomz Over a year ago

I wasn't sure if you needed the values - if you do, go with the associative array.

Jad Daoud Over a year ago

i need the values in the if condition, i was trying to say that if devices1 contains 1 for example, i need to check its checkbox

Shomz Over a year ago

Got it, I thought they were just being 0,1,2, etc. Use associative array and you'll be able to use both the keys and the values.

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