adding first code

sys0-code/api/free_printer.php

@@ -0,0 +1,25 @@
+<?php
+	include "../config/config.php"
+	$apikey=htmlspecialchars($_GET["apikey"]);
+	$apikey_fromdb="";
+	$sql="select apikey from api where id=1";
+	$stmt = mysqli_prepare($link, $sql);
+	mysqli_stmt_execute($stmt);
+	mysqli_stmt_store_result($stmt);
+	mysqli_stmt_bind_result($stmt, $apikey_fromdb);
+	mysqli_stmt_fetch($stmt);
+	if($apikey!=$apikey_fromdb)
+	{
+		echo("wrong apikey");
+		exit;
+	}
+
+	else
+	{
+		$id=htmlspecialchars($_GET["id"]);
+		$sql="update printer set free=1,printing=0,cancel=0 ,used_by_userid=0 where id=$id";
+		$stmt = mysqli_prepare($link, $sql);
+		mysqli_stmt_execute($stmt);
+	}
+
+?>