how to send data using post method in php code example

Example 1: php post

<form method="post" action="<?php echo $_SERVER['PHP_SELF'];?>">
  Name: <input type="text" name="fname">
  <input type="submit">
</form>
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
  // do logic
  $name = $_POST['fname'];
}
?>

Example 2: php get

<form method="GET">
  <input type="text" name="someName">
  //The Name Attribute will be put into the _GET inside of php 
  <input type="submit" value="Submit">
 </form>
  
<?php
$var = $_GET("someName");
echo ($var);
?>