How can default values be implemented in PHP functions to handle cases where no parameter is passed?

When no parameter is passed to a PHP function, default values can be implemented by assigning values to the parameters within the function definition. This ensures that the function can still be called without passing in all the parameters, as the default values will be used in those cases. 

function greet($name = "Guest") {
    echo "Hello, $name!";
}

// Calling the function without passing a parameter
greet(); // Output: Hello, Guest!

// Calling the function with a parameter
greet("John"); // Output: Hello, John!

Keywords

PHP functions default values parameters handling

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