Introduction to Server-Side Programming. Charles Liu
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1 Introduction to Server-Side Programming Charles Liu
2 Overview 1. Basics of HTTP 2. PHP syntax 3. Server-side programming 4. Connecting to MySQL
3 Request to a Static Site Server: 1. Homepage lookup 2. Send as HTTP Response HTTP Request: GET You (client) HTTP Response: web content (HTML file) Client-side code: HTML, CSS, JavaScript Web server IP:
4 Request to a Dynamic Site! The server must respond dynamically if it needs to provide different client-side code depending on the situation! Date and time! Specifics of the user s request! Database contents forms and authentication You (client) HTTP Request: GET HTTP Response: web content (HTML file) Client-side code: HTML, CSS, JavaScript (dynamically generated by server) Web server Server: 1. Look up things that go on user s profile, such as wall posts and friends " caches, database lookups 2. Generate client-side code containing these things 3. Send as HTTP response
5 sample http interactions GET, data passed as query string
6 sample http interactions POST, data passed as form data
7 http methods idempotent all safe GET HEAD PUT DELETE POST safe: no side effects idempotent: doing twice same as once PUT vs POST: PUT typically names a created object PUT & DELETE used in APIs but not usually in browsers
8 response status codes categories of codes 1xx informational 2xx success 3xx redirect 4xx client error 5xx server error most common codes 200 OK (request succeeded, resource is in message body) 404 Not Found (resource doesn t exist) 303 See Other (resource moved, see location header) 500 Server Error (web app implementer messed up)
9 Server-side options! PHP today! Easy to start, lower learning curve! Potentially messy as your site grows! Javascript frameworks node.js and Meteor.js! Ruby on Rails! Other options Django, Flask, Sinatra
10 PHP Introduction and Basic Syntax Charles Liu
11 What is PHP?! PHP = PHP: Hypertext Preprocessor! Server-side scripting language that may be embedded into HTML! Ultimate goal is to get PHP files to generate clientside code! must end up with HTML, CSS, JavaScript, other clientside code!
12 Side-by-side PHP File: <html> <head> <title> PHP Introduction </title> </head> <body> This is HTML! <br /> <?php echo 'This is PHP! <br />';?> </body> </html> Output: resulting HTML <html> <head> <title> PHP Introduction </title> </head> <body> This is HTML! <br /> This is PHP! <br /></body> </html>
13 A closer look <html> <head> <title> PHP Introduction </title> </head> <body> This is HTML! <br /> <?php echo 'This is PHP! <br />'; // prints to screen /* Here's a longer comment that spans multiple lines. */?> </body> </html>! PHP tags: <?php and?>! The echo command! Single line comment ( // )! Multiple line comment (/* and */)
14 Viewing PHP files! PHP files executed on the web server! Save.php files in subdirectory of web server! /var/www/ on many Linux configurations! web_scripts directory of your user directory on Athena! Make call to web server via domain name (google.com), IP address ( ), or localhost if on your own computer
15 PHP Syntax: Variables, Operators, and Strings Charles Liu
16 Variables! Store values for future reference, use variable name to refer to the value stored in it $x = 42; // store the value 42 in $x echo $x; // prints 42 echo $x+1; // prints 43, value of $x is still 42 $x = hello! // type of $x can change! PHP is a loosely-typed language! Do not need to declare the type of a variable! Type can change throughout the program
17 Operators! Arithmetic operators! +, -, *, /, % (modulus remainder after division)! Logical AND (&&), OR ( ), NOT (!)! Assignment operators (=)! Shorthand for assignment operators:! $x += $y equivalent to $x = $x + $y! Also works with subtraction, multiplication, division, modulus, and string concatenation
18 == versus ===! Two equality operators! == tests for equality in value but not necessarily type! === tests for identity in value AND type! == ignores the distinction between:! Integers, floating point numbers, and strings containing the same numerical value! Nonzero numbers and boolean TRUE! Zero and boolean FALSE! Empty string, the string 0 and boolean FALSE! Any other non-empty string and boolean TRUE
19 Strings! Concatenation of strings the. operator $a = hello ; $b = world ; echo $a.. $b.! ; // prints hello world!! String functions! Length: strlen()! Position of substring: strpos()! More on string functions:
20 PHP Syntax: Conditional and Looping Statements Charles Liu
21 Conditional Statements if (condition / boolean expression) { statements } else if (another condition) { statements } // there may be more than one else if block else { statements } $x = 5; if ($x == 5) { echo The variable x has value 5! ; }
22 Loops $x = 2; while ($x < 1000) { echo $x. \n ; // \n is newline character $x = $x * $x; } do { echo $x. \n ; $x = $x * $x; } while ($x < 1000); // note the semicolon for ($i = 1; $i <= 10; $i++) { echo $i. :. ($i * $i). \n ; }
23 PHP Syntax: Functions and Global Variables Charles Liu
24 Defining your own functions function function_name ($arg1, $arg2) { function code function parameters return $var // optional } Example: a simple multiply function function multiply($x, $y) { echo $x * $y; echo \n ; } multiply(5, 1.2); " prints 6 $a = 5; $b = 1.2; multiply($a, $b); " prints 6 $a = array(1,2,3); multiply($a, $b); " error $a = string multiply($a, $b); " prints 0 (?!)
25 Return values! A function can return a value after it is done! Use this value in future computation, use like a variable, assign value to a variable function multiply($x, $y) { return $x * $y; } multiply(2,3); " prints nothing! returns value, but we don t store anywhere echo multiply(2,3); " prints 6 $a = multiply(2,3); " assigns the value 6 to the variable $a $b = multiply(multiply(2,3), multiply(3,4)); " assigns the value 72 to the variable $b
26 Variable scope! Variables declared within a function have local scope! Can only be accessed from within the function <?php function function1() { // some code $local_var = 5; } echo $local_var + 3; // prints 8 // this variable is LOCAL to // function1() // some code function1(); echo $local_var; // does nothing, since $local_var is // out of scope?>
27 Global variable scope! Variables declared outside a function have global scope! Use global keyword to gain access within functions <?php function function1() { echo $a; // does nothing, $a is out of scope global $a; // gain access to $a within function echo $a; // prints 4 } // some code $a = 4; // $a is a global variable function1();?>
28 PHP Syntax: Arrays Charles Liu
29 Arrays as a list of elements! Use arrays to keep track of a list of elements using the same variable name, identifying each element by its index, starting with 0 $colors = array( red, blue, green, black, yellow );! To add an element to the array: $colors[] = purple ;! To remove an element from the array: unset($colors[2]); $colors = array_values($colors);
30 Arrays as key-value mappings! Use arrays to keep track of a set of unique keys and the values that they map to called an associative array $favorite_colors = array( Joe => blue, Elena => green, Mark => brown, Adrian => black, Charles => red );! To add an element to the array: $favorite_colors[ Bob ] = purple ;! To remove an element from the array: unset($favorite_colors[ Charles ]);! Keys must be unique: $favorite_colors[ Joe ] = purple overwrites blue
31 The for-each loop! The for-each loops allow for easy iteration over all elements of an array. foreach ($colors as $color) { echo $color; // simply prints each color } foreach ($colors as $number => color) { echo $number => $color ; // prints color with index // to change an element: // $colors[$number] = $new_color;
32 PHP HTTP Requests and Forms Charles Liu
33 Superglobals! A few special associative arrays that can be accessed from anywhere in a PHP file! The $_SERVER superglobal gives information about server and client! $_SERVER[ SERVER_ADDR ] " server IP! $_SERVER[ REMOTE_ADDR ] " client IP! $_SERVER[ HTTP_USER_AGENT ] " client OS and browser
34 Passing information to the server! Sometimes, we require additional values be passed from client to server! Login: username and password! Form information to be stored on server! GET request: pass information via the URL! firstparam=firstvalue&secondparam=secondvalue! Access values server-side using $_GET superglobal # $_GET[ firstparam ] => firstvalue # $_GET[ secondparam ] => secondvalue
35 When to use $_GET vs. $_POST! GET requests are sent via the URL, and can thus be cached, bookmarked, shared, etc! GET requests are limited by the length of the URL! POST requests are not exposed in the URL and should be used for sensitive data! There is no limit to the amount of information passed via POST
36 Dealing with forms! Forms are generally used to collect data, whether the data needs to be stored on the server (registration) or checked against the server (login)! 2 components to a form:! The HTML generating the form itself! The server-side script that the form data is sent to (via GET or POST), taking care of the processing involved # Server should respond appropriately, redirecting the user to the appropriate destination or generating the appropriate page
37 Forms: client-side <html> <head> <title> A Form Example </title> </head><body> <form action="welcome.php" method="post"> Name: <br /> <input type="text" name="name" /><br /> Phone Number: <br /> <input type="text" name="phone" /><br / > <input type="submit" value="submit"> </form> </body> </html>! form action where to send the form data! method how to send the data (GET or POST)! Name attributes become the keys used to access the corresponding fields in the $_GET or $_POST arrays
38 Forms: server-side <html> <head><title>this is welcome.php</title></head> <body> The name that was submitted was: <?php echo $_POST['name'];?><br /> The phone number that was submitted was: <?php echo $_POST['phone'];?><br /> </body> </html>! A simple PHP file that displays what was entered into the form! Can do many other things server-side depending on the situation
39 PHP Cookies and Sessions Charles Liu
40 Cookies and sessions! HTTP is stateless it does not keep track of the client between requests! But sometimes we need to keep track of this information! Shopping cart! Remember me on login sites! 2 solutions to this issue! Cookies small file stored client-side! Sessions relevant data stored on the server
41 cookies in http cookie is name-value pair expiration, path & domain server sends using set-cookie header browser sends back all unexpired cookies with matching path expiration session cookies: on quit persistent cookies: on expire a funny cookie tale nytimes.com used cookies to count #articles read, so viewers just deleted cookies...
42 Cookies! Cookies are stored on the user s browser, and are sent to the server on every relevant request! The $_COOKIE superglobal makes a cookie a keyvalue pairing! Store user information as a value with a known key! Never assume a cookie has been set. Always check with isset($_cookie[$cookie_name]) before trying to use the cookie s value
43 The setcookie() function! To set a cookie in PHP: setcookie(name, value, expire, path, domain);! Name and value correspond to $_COOKIE[$name] = $value! Expiration cookie will no longer be read after the expiration! Useful to use time in seconds relative to the present: # time() + time in seconds until expiration! Path and domain refer to where on the site the cookie is valid! Usually / for path and the top-level domain (yoursitename.com)! To delete a cookie, set a new cookie with same arguments but expiration in the past
44 Setting cookies! Cookies are set via the HTTP header! Must be sent before the body before any HTML, CSS, JS, etc.! This code will not work: if(isset($_cookie["6470"])) { $value = $_COOKIE['6470']; echo "Cookie is set to $value"; } else { $value = 0; } // after echo statement: will not work! setcookie("6470", $value+1, time()+60*60);?>
45 Sessions! Two main disadvantages of cookies! Limited in size by browser! Stored client-side " users / malicious people can change! Sessions store user data on the server! Limited only by server space! Cannot be modified by users! A potential downside to sessions is that they expire when the browser is closed! Sessions are identified by a session id: often a small cookie! But the rest of the data is still stored on the server
46 Using sessions! Call session_start() at top of every page to start session! Sets a cookie on the client: must follow same rules as cookies (before any HTML, CSS, JS, echo or print statements)! Access data using the $_SESSION superglobal <?php session_start(); if (isset($_session["count"])) { $_SESSION["count"] += 1; echo "You\'ve visited here {$_SESSION['count']} times"; } else { $_SESSION["count"] = 1; echo "You\'ve visited once"; }?>
47 Removing sessions! Remove an individual element of the $_SESSION superglobal! unset($_session[ key_name ]);! Destroy the entire session, remove all data! Use the function session_destroy()! $_SESSION no longer valid! Will need to call session_start() to start a new session
48 Recap: a comparison COOKIES SESSIONS Where is data stored? Locally on client Remotely on server Expiration? Variable determined when cookie is set Session is destroyed when the browser is closed Size limit? Depends on browser Depends only on server (practically no size limit) Accessing information? $_COOKIE $_SESSION General use? Remember small things about the user, such as login name. Remember things after re-opening browser Remembering varying amount of data about the user in one browsing session. More sensitive info.
49 PHP MySQL Charles Liu
50 Databases and MySQL! Databases give us an easy way to issue commands to insert, select, organize, and remove data! MySQL: open-source database, relatively easy to set up, easy to use with PHP! Other SQL databases, as well as non-sql options such as MongoDB
51 Connecting to MySQL! MySQL database server can contain many databases, each of which can contain many tables! Connecting to the server via PHP: $db = mysql_connect(server, username, password); if (!$db) { // terminate and give error message die(mysql_error()); } mysql_select_db(database_name, $db);! $db is a database resource type. We use this variable to refer to the connection created
52 Making SQL queries! PHP function for making queries: mysql_query(query_string, db_resource);! Queries that return information, such as SELECT: returns a resource $result = mysql_query(query_string, $db);! In this case, this resource is stored in the variable $result! Other queries, returns TRUE upon success.! All queries return FALSE on failure. Best practice is to handle the error (e.g. die(mysql_error()))
53 Retrieving information from a query! Loop over the returned $result resource, row by row $result = mysql_query(query, $db); while ($row = mysql_fetch_assoc($result)) { $col1 = $row['column_1_name']; $col2 = $row['column_2_name']; // and so forth... }
54 A shared database resource! Don t repeat code - put database connection, select database code into the same file! Reference the connection resource ($db) in other files (using include($file_path))
55 SQL queries! INSERT INTO table_name (col1, col2 ) VALUES (val1, val2 )! SELECT col1, col2 FROM table_name WHERE conditions! CREATE TABLE table_name (column_name data_type(size), column_name data_type(size) )
56 The relational model! Indicate relations between objects (rows) with an id " a pointer to a row in a different table! The INNER JOIN
57 what is a relational database? a relation is a set of tuples tuple is ordered, set isn t a relational database is a set of named relations with named columns users id first last password 1 Ann Alert aa@mit aa 2 Chloe Closure cc@mit blah 3 Ben Bitdiddle ben@mit 1010 subjects id by name category 1 3 Lucid Clover Cosi 1 id by content rating about 1 3 yummy! neat 4 1 categories id name 1 Food 2 Tech 3 Travel reviews
58 query operators relational algebra operators select: filter rows by a predicate project: filter by columns product: combine two tables in SQL, all parts of select statement -- show content and ratings of reviews about Clover select content, rating from subjects, reviews where subjects.id = reviews.about and name = "Clover"
59 deconstructing a query subjects id by name category 1 3 Lucid Clover Cosi 1 reviews id by content rating about 1 3 yummy! neat product operator (implicit in list of tables) select * from subjects, reviews examples from RazorSQL: available at
60 deconstructing a query subjects id by name category 1 3 Lucid Clover Cosi 1 reviews id by content rating about 1 3 yummy! neat selection operator (where) select * from subjects, reviews where subjects.id = reviews.about and name = "Clover"
61 deconstructing a query subjects id by name category 1 3 Lucid Clover Cosi 1 reviews id by content rating about 1 3 yummy! neat projection operator (implicit in list of columns) select content, rating from subjects, reviews where subjects.id = reviews.about and name = "Clover"
62 your turn what does this query say? select distinct name from subjects, reviews where rating = 5 -- lists all subject names: oops! subjects users categs reviews
63 special operators order by: sort the results by some column sum, avg, count, max, min group by: group rows before applying functions -- show subjects and their average ratings select name, avg(rating) from subjects, reviews where reviews.about = subjects.id group by subjects.id -- show reviews ordered by rating select name, content, rating from subjects, reviews where reviews.about = subjects.id order by rating
64 PHP Conclusion Charles Liu
65 What we ve talked about! Purpose of server-side programming! Basic PHP syntax, arrays, functions! Specifics to websites: cookies, sessions, HTTP requests and forms, MySQL! Other server-side solutions:! ASP.NET! Python! PHP s extensive documentation:
66 PHP workshop and tomorrow! Mostly to get you set up with a PHP server, write some simple code! Tomorrow: more server-side frameworks! Node.js! Meteor.js! , 11AM
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