How to get php value from html element

There are several ways to get the value of a HTML element using PHP, but here are a couple of common methods:

1. Using the $_POST or $_GET superglobal arrays:

<form method="post" action="your-php-file.php">
  <input type="text" name="elementName">
  <input type="submit" value="Submit">
</form>

In the PHP file, you can get the value of the element by accessing the $_POST array:

$elementValue = $_POST['elementName'];

2. Using the $_REQUEST superglobal array:

<form method="post" action="your-php-file.php">
  <input type="text" name="elementName">
  <input type="submit" value="Submit">
</form>

In the PHP file, you can get the value of the element by accessing the $_REQUEST array:

$elementValue = $_REQUEST['elementName'];

3. Using javascript and ajax to send the value to the server and retrieve it with php

 <input type="text" id="elementName">
  <button onclick="sendValue()">Submit</button>
  <script>
    function sendValue(){
        var elementValue = document.getElementById("elementName").value;
        $.ajax({
            type: "POST",
            url: "your-php-file.php",
            data: {elementName:elementValue},
            success: function(data) {
                // handle the response from the server
            }
        });
    }
  </script>

and in the PHP file you can retrieve it like this

$elementValue = $_POST['elementName'];

It depends on your use case, but any of these methods can be used to get the value of a HTML element using PHP.