php: tutorial(s) / quickref(s)

• marker(s) -- <?php ... ?>
• argument(s) -- GET, POST
• include(s) -- <?php include("header.php"); ?>
• file(s) -- fopen("welcome.txt","r");
• upload(s) -- FILES["file"]["error"]
• mysql -- mysql_connect(server ,user ,password );
• query -- mysql_query("CREATE DATABASE db",$con))

reference(s) -- database, XML, ajax