How can one effectively debug and diagnose empty content variables in PHP?

To effectively debug and diagnose empty content variables in PHP, you can use the `empty()` function to check if a variable is empty or not. Additionally, you can use `var_dump()` to display the variable's contents and type for further analysis. Make sure to also check for any potential issues with variable assignment or data retrieval that may be causing the variable to be empty.

$content = ''; // Empty content variable

// Check if the content variable is empty
if (empty($content)) {
    echo "Content variable is empty";
} else {
    // Display the variable's contents and type for further analysis
    var_dump($content);
}