How can a function be created in PHP to validate input values and return a true/false result?

To create a function in PHP to validate input values and return a true/false result, you can define a function that takes the input value as a parameter, performs the validation logic within the function, and returns true if the input is valid and false if it is not. This function can be reused throughout your codebase to validate different input values easily.

function validateInput($input) {
    // Add your validation logic here
    // For example, check if the input is not empty
    if (!empty($input)) {
        return true;
    } else {
        return false;
    }
}

// Example of using the validateInput function
$inputValue = "example";
if (validateInput($inputValue)) {
    echo "Input is valid";
} else {
    echo "Input is not valid";
}