What are the potential pitfalls of leaving variables empty in PHP code?

Leaving variables empty in PHP code can lead to unexpected behavior or errors in your application. It is important to always initialize variables with default values or validate user input to ensure that they are not empty. One way to prevent this issue is to use conditional statements to check if a variable is empty before using it in your code. 

// Check if a variable is empty before using it
$myVariable = '';

if (!empty($myVariable)) {
    // Do something with $myVariable
} else {
    echo "Variable is empty";
}

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