declaring a big list of variables

Question

I have a big list of variables:

$variable_1 = $_POST['variable_1'];
$variable_2 = $_POST['variable_2'];
$variable_3 = $_POST['variable_3'];
$variable_4 = $_POST['variable_4'];
...
..
.
$variable_86 = $_POST['variable_86'];

What would be the best way to declare all of these variables? Should I just declare them all like above, should I put them in an array, can I declare using a loop?

score 5 · Accepted Answer · edited May 23 '17 at 12:19

5

for ($i = 0; $i <= 86; $i++){
     if (isset($_POST["variable_$i"]))
     ${'variable'.$i} = $_POST["variable_$i"];
}

See this question to learn about Dynamic Variable names.

EDIT: Added the isset command. isset() checks whether a variable is already declared or not

edited May 23 '17 at 12:19

Community

1
1

answered Dec 19 '13 at 18:14

Eisa Adil

1,605
10
16

Thanks! This seems to work but it gives me a `Notice: Undefined index: ` error – bryan Dec 19 '13 at 18:20
Use `isset()` to check if the variable is defined or not. – Eisa Adil Dec 19 '13 at 18:27
Another Happy Ending :) – Funk Forty Niner Dec 19 '13 at 18:31
That loop is pretty much equal to `extract($_POST, EXTR_SKIP);` – nice ass Dec 19 '13 at 18:51
Only thing is it doesn't affect the other `$_POST` variables while `extract()` does :) – Eisa Adil Dec 19 '13 at 19:16

Funk Forty Niner · Answer 2 · 2013-12-19T18:36:25.707

You can use any of the following:

foreach($var as $key=>$value) {
echo $value;
}

and/or:

foreach($_POST['var'] as $key=>$value) {
echo $value;

You could use this also, that will iterate through all POST values:

foreach($_POST as $key=>$value) {
echo "$key=$value";
}

Also, assuming $_POST['variable_1'] $_POST['variable_2'] etc.

foreach($_POST as $k => $v) {
    if(strpos($k, 'variable_') === 0) {
        echo "$k = $v";
    }
}

declaring a big list of variables

2 Answers2