如何创建一个可以连接到mysql的简单api？ [关闭]

I need help on how to make an API for PHP. I was trying to make one web server communicate with another webserver through PHP.

I also want it to update MySQL code. I was using $_GET but it was less secure. Here is my code, can you please take a look at it?

<?php
/*
example: website-url-here.com/?command=insert-command-here&password=testing
*/
$command = $_GET["command"];
$password = $_GET["password"];
if ($password == "testing") {
//Was not a good idea, less secure.      
//echo eval($command);
//More secure
  if ($command == "create-user")
  {
   //create user command here
  } 
  else if ($command == "delete-user")
  {
   //delete user command here
  } 
  else
  {
  die("Command is incorrect");
  }
}
echo "Success";
?>

This question is way too open ended to answer in a StackOverflow answer. Try reading up a little on REST, and a lot on PDO, especially in the context of sanitizing user input.

Think about what would happen if somebody called your api with [url]?command=rm -rf .&password=testing