how to avoid output foreach error?

Question

In this article, it mentions:

foreach does not support the ability to suppress error messages using '@'.

How do I avoid an output foreach error? I do not want see:

Warning: Invalid argument supplied for foreach()

Is there a way to make an if else judgement?

Answer 1

Before foreach check if variable contain array:

if (is_array($var))
{
   foreach...
}

Answer 2

prefix the variable with a (array) like this.

foreach( (array) $array_thats_not_an_array as $key => $value ){
    echo $key . ' ' . $value;
}