What are some common reasons for receiving the "Invalid argument supplied for foreach()" error in PHP scripts?

The "Invalid argument supplied for foreach()" error in PHP scripts occurs when the foreach loop is trying to iterate over a variable that is not an array or an object. To solve this issue, you should check if the variable is an array or object before using it in a foreach loop.

if(is_array($variable) || is_object($variable)) {
    foreach($variable as $item) {
        // Your code here
    }
} else {
    // Handle the case where $variable is not an array or object
}