How can the error message "Invalid argument supplied for foreach()" be resolved in PHP when using foreach loops?

The error message "Invalid argument supplied for foreach()" occurs when the argument passed to the foreach loop is not iterable, such as a non-array variable or an empty array. To resolve this issue, you should first check if the argument is iterable before using it in the foreach loop. This can be done using the is_array() function or the is_iterable() function (available in PHP 7.1 and later).

// Check if the argument is iterable before using it in the foreach loop
if (is_array($array) || is_object($array)) {
    foreach ($array as $item) {
        // Your code here
    }
} else {
    // Handle the case where the argument is not iterable
    echo "Invalid argument supplied for foreach loop";
}