<form>
<input type="email" name="email" />
<input type="text" name="phone" />
<button>Send</button>
</form>

$name = trim($_GET["name"]);
$phone = trim($_GET["phone"]);

<form method="POST">
    <input type="email" name="email" />
    <input type="text" name="phone" />
    <button type="submit" name="submit1">Send</button>
</form>
<form method="POST">
    <input type="email" name="email" />
    <input type="text" name="phone" />
    <button type="submit" name="submit2">Send</button>
</form>
<form method="POST">
    <input type="email" name="email" />
    <input type="text" name="phone" />
    <button type="submit" name="submit3">Send</button>
</form>
<?php
if(!empty($_POST)){
    if(isset($_POST['submit1'])){
        var_dump($_POST);
    }elseif(isset($_POST['submit2'])){
        var_dump($_POST);
    }elseif(isset($_POST['submit3'])){
        var_dump($_POST);
    }
}