How can the isset function be used effectively to prevent variable content from disappearing in PHP?

When using variables in PHP, it's important to check if they are set before trying to access their content to prevent errors or warnings. The isset() function can be used to determine if a variable has been set and has a non-null value. By using isset() before accessing variable content, you can ensure that the content will not disappear and avoid potential issues in your code.

// Check if the variable is set before accessing its content
if(isset($variable)){
    // Use the variable content safely
    echo $variable;
} else {
    echo "Variable is not set";
}