$_request

[lillop]

Salve

Non riesco a capire a cosa serve $_request["seen_already"]

<?php
            $errors = array();
            if(isset($_REQUEST["seen_already"])){
                validate_data();
                if(count($errors) != 0){
                    display_errors();
                    display_welcome();
                } 
                else {
                    process_data();
                }
            } 
            else {
                display_welcome();
            }
            function validate_data()
            {
                global $errors;
                if($_REQUEST["FirstName"] == "") {
                    $errors[] = "<FONT COLOR='RED'>Please enter your first name</FONT>";
                }
                if($_REQUEST["LastName"] == "") {
                    $errors[] = "<FONT COLOR='RED'>Please enter your last name</FONT>";
                }
            }
            function display_errors()
            {
                global $errors;
                foreach ($errors as $err){
                    echo $err, "
";
                }
            }

            function process_data()
            {
                echo "Your first name is ";
                echo $_REQUEST["FirstName"];
                echo "
Your last name is ";
                echo $_REQUEST["LastName"];
            }

            function display_welcome()
            {
                $first_name = isset($_REQUEST["FirstName"]) ? $_REQUEST["FirstName"] : "";
                $last_name = isset($_REQUEST["LastName"]) ? $_REQUEST["LastName"] : "";
                echo "<FORM METHOD='POST' ACTION='index.php'>";
                echo "What's your first name?";
                echo "<INPUT NAME='FirstName' TYPE='TEXT' VALUE='", $first_name, "'>";
                echo "
";
                echo "What's your last name?";
                echo "<INPUT NAME='LastName' TYPE='TEXT' VALUE='", $last_name, "'>";
                echo "
";
                echo "<INPUT TYPE=SUBMIT VALUE=Submit>";
                echo "<INPUT TYPE=HIDDEN NAME='seen_already' VALUE='hidden_data'>";
                echo "</FORM>";
            }
        ?>