What steps can be taken to properly define variables in PHP scripts to avoid "Undefined variable" errors?

To properly define variables in PHP scripts and avoid "Undefined variable" errors, always initialize variables before using them. This can be done by assigning a default value or checking if the variable has been set using isset() or empty() functions. By defining variables before using them, you can ensure that your code runs smoothly without encountering any undefined variable errors.

// Example of properly defining variables to avoid "Undefined variable" errors

$variable = ""; // Initialize variable with a default value

if(isset($variable)) {
    // Use the variable here
    echo $variable;
} else {
    // Handle case when variable is not set
    echo "Variable is not set";
}