Some common php simple command code highlights

Some common php simple command code highlights are deleted:
Reference
If (file_exists ("file.htm") // check whether this file exists
If (file_exists ("chat") // check whether this folder exists
Rename ('index. php', 'index'); // rename index. php to index
Fopen ("name. php", "a +"); // create a file
Mkdir ("boot", "0777"); // create a folder and set the property to 777.
Rmdir ("include"); // delete a folder
Unlink ("index. php"); // delete an object

Database query:
Reference
$ Db = new db_query;
$ Db-> connect ();
$ Db-> query ("drop database $ DbName;"); // $ dbname indicates the DATABASE name.

Connection:
Reference
Header ("location: index. php"); // go to the webpage
Echo "Step 2: select whether to delete all files [chat room]
"; // Write the code
Unset ($ tmp); // clear the original cache
Require ("global. php"); // cache
Print <eot // write code
Eot;