How can errors like "Invalid argument supplied for foreach()" be resolved in PHP code?

The "Invalid argument supplied for foreach()" error occurs when you try to loop through a variable that is not an array or an object. To resolve this issue, you should check if the variable is iterable before using a foreach loop. You can use the is_array() or is_object() functions to ensure that the variable can be looped through.

if (is_array($variable) || is_object($variable)) {
    foreach ($variable as $item) {
        // Code to execute for each item
    }
} else {
    // Handle the case when $variable is not iterable
}