Session Vars
	Use one cookie
	Store data locally
	Language dependent

Cookies
	Uses
	Size limit
	what to do if turned off
	Can they be trusted?
	When can you set them in PHP

Login
	passwords always encrypted!
	probably set a session var or cookie
	if cookie
		Pick random number
		Verify random number
	Know this is vulnurable to snoop attack

Data verification
	Javascript gives a good user experience but cannot be trusted
	Server side can be trusted.

SQL
	ACID properties
		Atomic -- The transaction runs completely or not at all
		Consistent -- Each transaction moves from one consistent state to another
		Independent -- Every transaction runs as if it were the only one on the system
		Durable -- Data changes survive hardware and software failure.
	Abort 
	Table vs database
	create table
		schema
		not null
		primary key
	types
		decimal(5,2)
		date and time types
		enum
		blob/longblob
		char[n] vs varchar[n]
		money
		autoincrement
	update tablename set columnname = value where ...
	delete from tablename where ...
	select columnname from tablename where .. order by columname limit 3
	alter table ...
	drop tablename
	describe table tablename
	joins
	nested queries (and in vs =)
	insert into tablename values ( ...)
	database decomposition
		might cost speed
		reduces redundency and possibility of inconsistency
	Indexes
	What is an SQL injection attack (i.e. little bobby tables)!!!!
	Should media files be in the database
	
	
PHP
	Built in arrays
		$_GET
		$_POST
		$_COOKIE
		$_SESSION
		$_REQUEST
	Error supression with @
	isset($varname)
	empty($varname)	
	Error checking with die
	Arrays
		Not really arrays
		indexed by key, which can be string
		not always the same type
		foreach ($array as $item)
		foreach($array as $key => $value)
	Cookies
		setcookie(...)
		$_COOKIE
	Session variables
		$_SESSION
		Needs cookies
	Loops
		while loops
		for loops
		foreach($array as $value)
		foreach($array as $index => $value)
	Functions
	print_r
	header("location: ...")	
	Variables
		global
		superglobal
			$_REQUEST
			$_COOKIE
			$_POST
			$_GET
	Databases
		Know some way to fetch data like
		http://euclid.nmu.edu/~rappleto/Classes/CS465/PHP/Databases/Database_Example_Object.php.txt
		real_escape_string
		Error checking

	File Uploads
		See https://www.php.net/manual/en/features.file-upload.post-method.php


Multi layer architecture



Regular Expressions
	end of line chars ^ and $
	Repeat chars * and +
	Maybe char ?
	Sets of chars [abc] and [^abc]
	Ranges of chars [a-z]
	Special sets like /s and /S
	modifiers like “/steve/iâ€

Regular Expression PHP Methods
	preg_match and preg_match_all
	preg_replace
	preg_split


PIP (Just that it exists)
	The Python installer program
	Uses a library of modules stored "in the cloud"
	pip3 install thing -- on the command line