Are there best practices for handling multiple input variables in PHP to avoid issues with empty outputs?

When handling multiple input variables in PHP, it's important to check if each variable is set and not empty before using it to avoid issues with empty outputs. One way to do this is by using the isset() and !empty() functions to validate the input variables before processing them. 

// Example of handling multiple input variables in PHP to avoid empty outputs

$input1 = isset($_POST['input1']) ? $_POST['input1'] : '';
$input2 = isset($_POST['input2']) ? $_POST['input2'] : '';
$input3 = isset($_POST['input3']) ? $_POST['input3'] : '';

if (!empty($input1) && !empty($input2) && !empty($input3)) {
    // Process the input variables
    // Your code here
} else {
    echo "Please fill in all input fields.";
}

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