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Programming Background for WordPress
Barnabas KimMobile Augmented Reality
July 22, 2012
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TABLE OF CONTENTS
WE WILL COVER THE BELOW TOPICS TODAY:
• TOPICS1. Preliminaries2. PHP Tutorial for WordPress3. Anatomy of a WordPress theme
July 22, 2012
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Topic #1:Preliminaries
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BASIC CONCEPTS: Web Server Stacks
July 22, 2012
HARDWARE
SOFTWARE
SERVER (or PC)
Operating System (Linux / MacOS / Windows)
Apache Web Server (80) MySQL DB Server (3306)
PHP Parser (Server-side script)
Web Applications(WordPress)
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BASIC CONCEPTS: Client↔Server Interaction
July 22, 2012
1. USER: Request URL (via Web Browser)http://wordpress.org
Apache Web Server (80)
Port: 80Host: wordpress.orgIP: 72.233.56.139URL: /
2. Web Server:Response to the requested URLbased on the setting
/home/wordpress/index.php
3. Read and parse the corresponding file
<html><body><div><?php echo “Wordpress”; ?></div></body></html>
<html><body><div>Wordpress</div></body></html>
4. Print the parsed webpage to the browser
Parse
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Topic #2:PHP Tutorial for WordPress
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PHP Tutorial for WordPress
• Contents1. What is PHP? PHP vs. HTML2. How do I insert PHP into a web page?3. Variables4. Conditional statements5. Functions
• Reference– http://adambrown.info/b/widgets/easy-php-tutorial-for-wordpress-
users/
July 22, 2012
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PHP Tutorial: 1. What is PHP?
• PHP is Server-side script that makes webpage dynamic.
– Static Web page:
– <p>Today is July 22, 2012</p>
– Dynamic Web page:
– <p>Today is <?php echo date(“F j, Y”); ?>
• PHP code does not get sent to the browser, only the HTML that the PHP parser produces.
July 22, 2012
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PHP Tutorial: 2. How do I insert PHP into web page?
• PHP codes should be wrapped by <?php … ?> or <? … ?>
– <div>
– <?php
– $var1 = “Hi, WordPress!”; ⁄⁄ two slashes indicate that everything until the end of the line is a comment
– $var2 = “Hi, Man!”;
– /*
– if your comment spans more than one line,
– like this one, use the slash-asterisk format.
– */
– echo $var1; echo “<br/>”;
– echo $var2; echo “<br/>”;
– ?>
– </div>
July 22, 2012
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PHP Tutorial: 3. Variables (1/2)
• A variable is always written with $ at the beginning, and the alphabetical words from the second letter.
• For string values, it should be enclosed with ‘ (apostrophe) or “ (quotes). Every line should be ends with ; (semicolon)
– <?php
– $nDate = 22;
– $myFirstName = “Barnabas”;
– $myFamilyName = ‘Kim’;
– ?>
• Note that,
1. Case sensitive:
– e.g. $myname, $myName are totally different variables.
2. Does not allow to starts with ‘number’ or ‘special character’:
– e.g. $_myname (X), $1234 (X) are not correct.
July 22, 2012
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PHP Tutorial: 3. Variables (2/2)
• To display the contents of a variable on the web page, just use echo. You should allocate variables before using echo.
– <?php
– $nDate = 22;
– echo $nDate;
– ?>
• To append something to an existing variable, use . (dot)
– <?php
– $date = 22;
– $month = “July”;
– $year = 2012;
– $strToday = $month.” ”.$date.”, ”.$year;
– ?>
July 22, 2012
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PHP Tutorial: 4. Conditional Statements
• Conditional statements checks condition before proceeding or to repeat a block of code multiple times.
– Control statements:
– if .. elseif .. else
– <?php
– $var = 10;
– if($var == 5){
– echo “5 in the variable”;
– }else if($var > 5){
– echo “The variable has the value bigger than 5”;
– }else{
– echo “The variable has the value smaller than 5”;
– }
– ?>
– Loop: while, for, foreach (These are not covered in this tutorial.)
July 22, 2012
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PHP Tutorial: 5. Functions (1/2)
• If a function is called (sometimes with input parameters), the function returns values (sometimes not).
– <?php
– echo date(“Y-m-d”);
– echo time();
– include(“header.php”);
– ?>
• A function can be regarded as a variable.
– <?php
– if(date(“Y-m-d”) == “2012-07-22”){
– echo “Today is 2012-07-22”;
– }
– ?>
July 22, 2012
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PHP Tutorial: 5. Functions (2/2)
There are two types of functions
1. Internal (built-in) functions:
– String, Variable, Image Functions, …
– Function Reference: http://www.php.net/manual/en/funcref.php
– e.g.
– <?php
– $var1 = “Hello!”;
– echo str_replace(“He”, “”, $var1); // llo!
– ?>
2. User-defined functions
– <?php
– function add($a, $b){
– return $a+$b;
– }
– echo add(100, 200); // 300
– ?>
July 22, 2012
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Topic #3:Anatomy Of A WordPress Theme
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Anatomy of a WordPress theme
• Contents1. Main Parts2. Sections for “The Loop”3. The Loop4. Additional Files5. The Extras
• Reference– http://yoast.com/wordpress-theme-anatomy/
July 22, 2012
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Anatomy of a WordPress theme: Main Parts
July 22, 2012
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Anatomy of a WordPress theme: Sections for “The Loop”
July 22, 2012
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Anatomy of a WordPress theme: The Loop
July 22, 2012
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Anatomy of a WordPress theme: Additional Files
July 22, 2012
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Anatomy of a WordPress theme: The Extras
July 22, 2012
Thank you for your attention!any Question?