Send HTML values to PHP function

The ideal would be to know if it is a form and you want to do it from the submit of your button or, you would like to send them by ajax .

In the first case you have two options using method GET and method POST

<form action="tu_archivo.php" method="post">
    Nombre usuario: <input type="text" name="username" /><br />
    Email:  <input type="text" name="email" /><br />
    <input type="submit" name="submit" value="¡Enviarme!" />
</form>

The tag action goes the path of your php file, as you mention that in that same file there are several functions would be something like this from PHP:

<?php
    $action = '';
    if (isset($_POST['action'])) {
        $action = $_POST['action'];
        switch ($action) {
            case 'login' : 
                login();
                break;
            case 'register' :
                register();
                break;
            ....
        }
    }
?>

Thus, you get the action that is called and you can call your function without any problem and from the function access the values:

function login() {
    $user = $_POST['username'];
}

In the second case, you can use ajax and you should include jquery to your project.

$.ajax({
    url: "tu_archivo.php",
    type : "POST",
    data: { username : 'test', 'action' : 'login' },
    ...
});

Working in the same way.

What you should do is direct with types of methods that exist:

Example of only 2

 <form action="registrar.php" method ="post">
 <form action="registrar.php" method ="get">

Depending on what you want to do,

Your question is very basic, I hope this helps you

<form method="post" action="PAGINA A LA QUE QUERES MANDAR LOS DATOS">
// VARIABLE 1 //
  <div class="form-group">
    <label>NOMBRE DE LA VARIABLE</label>
    <input type="TEXT, NUMBER, EL QUE NECESITES" class="form-control" 
 name="NOMBRE DE LA VARIABLE">
  </div>
// VARIABLE 2 //
  <div class="form-group">
    <label>NOMBRE DE LA VARIABLE</label>
<input type="TEXT, NUMBER, EL QUE NECESITES" class="form-control" name="NOMBRE DE LA VARIABLE">
</div>
// VARIABLE 3, ETC //
// CON UN BOTON TIPO SUBMIT ENVIAS LOS DATOS A LA OTRA PAGINA //
 <button type="submit" class="btn btn-default">ENVIAR</button>
  </form>

And on the other page, the screenshots:

<?php
$VARIABLE1 = $_POST['NOMBRE DE LA VARIABLE 1'];
$VARIABLE2 = $_POST['NOMBRE DE LA VARIABLE 2'];
$VARIABLE3 = $_POST['NOMBRE DE LA VARIABLE 3 ETC'];

// Y USAS LAS VARIABLES $VARIABLE1, $VARIABLE2, $VARIABLE3 DONDE NECESITES //
?>

You have to recover them in the destination PHP page, through the variables:

• $ _ GET [ <name >]
• $ _ POST [ <name >]

depending on the method you use in the form header (method = 'POST' / 'GET').

<name> , is the same attribute that you used when creating the form objects to which you refer.