Invalid argument supplied for foreach

Question

To handle data that can be either an array or a null variable and to feed some foreach with these data.

$values = get_values();

foreach ($values as $value){
  ...
}

When you feed a foreach with data that are not an array, you get a warning:

Warning: Invalid argument supplied for foreach() in [...]

 Can someone please help me with this error?

Answer 1

Use this:

if (is_array($values) || is_object($values))
{
    foreach ($values as $value)
    {
        ...
    }
}

This doesn't allocate an empty array when you've got nothing, to begin with anyway.

I hope this helps.