how to read post data to php code example

Example 1: post request php

$response = httpPost("http://mywebsite.com/update.php",
	array("first_name"=>"Bob","last_name"=>"Dillon")
);

//using php curl (sudo apt-get install php-curl) 
function httpPost($url, $data){
    $curl = curl_init($url);
    curl_setopt($curl, CURLOPT_POST, true);
    curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($data));
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    $response = curl_exec($curl);
    curl_close($curl);
    return $response;
}

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);
?>