Question

My code is:

HTML part for POST:

<form action='key.php' method='POST'> 
<input type='number' name='consumervar[]' value='512'/>
<input type='number' name='consumervar[]' value='256'/>
<input type='number' name='consumervar[]' value='1024'/>
<input type='submit'/>
</form>

PHP Code for key.php:

<?PHP
  foreach ($_POST as $key => $value) {
    $consumervar = $value*64;
  }
  print_r($consumervar); // this is for for debug (see array contents)
?>

BUt when i run everything it reproduces:

Fatal error: Unsupported operand types in /var/blahblah/blahblah/key.php on line 3

Please help. How to do it correctly? It need to multiply every posted value with integer 64.

Answer 1

the loop should be

foreach($_POST['consumervar'] as $key => $value) {
              ^^^^^^^^^^^^^^^

as written, your code pulls out the ARRAY of consumervar values, which you try to multiply. You cannot “multiply” arrays in php.

As well, note that the $key/$value produced by the loop are simply copies of what exists in the array. You are not changing the array’s values. For that, you should be doing

 $_POST['consumervar'][$key] = $value * 64;