Question

I have several like this in my HTML code:

<input class="table" type="checkbox" name="interest[]" value="finger food" />

and this in my PHP code:

$checkboxes = stripslashes($_POST['interest']);

//process the checkboxes
foreach ($checkboxes as $value) {
    $selectedChkbx .= $value . ", ";
}

I am getting:

Warning: Invalid argument supplied for foreach()foreach()

and my $selectedChkbx variable isn’t getting any values inside of it. Does anyone know what I’m doing wrong?

Answer 1

stripslashes($_POST[‘interest’]);

stripslashes doesn’t work on arrays!

Do it like this:

$checkboxes = $_POST['interest'];

//process the checkboxes
foreach ($checkboxes as $value) {
    $selectedChkbx .= stripslashes($value) . ", ";
}

Answer to your comment:

$array = array('zero', array('one', array('two', 'three', 'four'), 'five'), 'six', 'seven', array('eight'));

echo r_implode(", ", stripslashes_deep($array));

# code from http://ch.php.net/manual/en/function.stripslashes.php
function stripslashes_deep($value)
{
    $value = is_array($value) ?
                array_map('stripslashes_deep', $value) :
                stripslashes($value);

    return $value;
}


# code from http://php.net/manual/en/function.implode.php
function r_implode( $glue, $pieces )
{
  foreach( $pieces as $r_pieces )
  {
    if( is_array( $r_pieces ) )
    {
      $retVal[] = r_implode( $glue, $r_pieces );
    }
    else
    {
      $retVal[] = $r_pieces;
    }
  }
  return implode( $glue, $retVal );
} 

This gives you:

zero, one, two, three, four, five, six, seven, eight

Edit
Replaced personal recursive function with a more elegant one 😉