What are the recommended approaches for debugging and troubleshooting PHP scripts, particularly when encountering warnings or errors like "Invalid argument supplied for foreach()"?

When encountering errors like "Invalid argument supplied for foreach()", it typically means that the variable being passed to the foreach loop is not an array. To solve this issue, you can first check if the variable is an array using the is_array() function before attempting to iterate over it.

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