PHP For Absolute Beginners

PHP For Absolute Beginners Matt Wiebe @mattwiebe wp.mattwie.be Design Engineer
Automattic / WordPress.com

PHP For people who may or may not know what
that is.

What is PHP?

What is PHP? ★ The thing that makes WordPress work

★ The thing you should know a little bit about if you want to tweak a theme or plugin.

★ The thing you should know a little bit about if you want to tweak a theme or plugin. ★ PHP: Hypertext Preprocessor

★ The thing you should know a little bit about if you want to tweak a theme or plugin. ★ PHP: Hypertext Preprocessor ★ The easiest way to get started with programming.

★ The thing you should know a little bit about if you want to tweak a theme or plugin. ★ PHP: Hypertext Preprocessor ★ The easiest way to get started with programming. (except maybe JavaScript)

What is PHP? <!DOCTYPE html> <html> <body> </body> </html>

What is PHP? <!DOCTYPE html> <html> <body> <?php echo "Hello
World"; ?> </body> </html>

Why should I learn PHP?

Why should I learn PHP? ★ It’s what makes WordPress
sing and dance

sing and dance ★ It’s easy

sing and dance ★ It’s easy ★ It’s fun

sing and dance ★ It’s easy ★ It’s fun ★ It might turn a hobby into a career

THE BASICS

Variables

Variables $my_string = 'bar';

Variables $my_string = 'bar'; // This is a comment. It
is ignored.

is ignored. $my_number = 3;

is ignored. $my_number = 3; $my_array = array('one', 'two', 'ten');

is ignored. $my_number = 3; $my_array = array('one', 'two', 'ten'); $my_boolean = true;

is ignored. $my_number = 3; $my_array = array('one', 'two', 'ten'); $my_boolean = true; /* Now you've seen 4 types of data */

Operations

Operations $first_name = 'Matt'; $last_name = 'Wiebe';

Operations $first_name = 'Matt'; $last_name = 'Wiebe'; // Concatenation $full_name
= $first_name . ' ' . $last_name;

Operations $my_age = 33; $my_nephews_age = 3;

Operations $my_age = 33; $my_nephews_age = 3; // Simple numeric
operations: +-*/ $age_difference = $my_age - $my_nephews_age;

Comparisons

Comparisons $my_name = 'Matt'; $dans_name = 'Dan'; $my_bosses_name = 'Matt';

$my_name == $dans_name

$my_name == $dans_name;

$my_name == $dans_name; // false;

$my_name == $dans_name; // false; $my_name == $my_bosses_name;

$my_name == $dans_name; // false; $my_name == $my_bosses_name; // true;

Comparisons $a == $b // Equal $a != $b //
Not equal $a >= $b // $a greater than or equal to $b $a <= $b // $a less than or equal to $b $a > $b // $a greater than $b $a < $b // $a less than $b

Comparisons $a == $b // Equal $a != $b //
Not equal $a >= $b // $a greater than or equal to $b $a <= $b // $a less than or equal to $b $a > $b // $a greater than $b $a < $b // $a less than $b /* There are a lot more but that’s all we’ll cover now. */

Using Comparisons if ( $a == $b ) { }

Using Comparisons if ( $a == $b ) { //
do something }

do something } else { }

do something } else { // do something else }

Functions

Functions $name = 'Matt Wiebe';

Functions $name = 'Matt Wiebe'; $fun = str_replace( 'Matt', 'Jerk',
$name );

Functions $name = 'Matt Wiebe'; $fun = str_replace( 'Matt', 'Jerk',
$name ); echo $fun; // 'Jerk Wiebe'

WordPress Functions

WordPress Functions In WordPress, template tags are PHP functions.

WordPress Functions <a href="<?php echo home_url(); ?>">Home</a>

WordPress Functions <a href="<?php echo home_url(); ?>">Home</a> <article> <h1> <a
href="<?php the_permalink(); ?>"> <?php the_title(); ?> </a> </h1> <?php the_content(); ?> </article>

href="<?php the_permalink(); ?>"> <?php echo the_title(); ?> </a> </h1> <?php the_content(); ?> </article>

href="<?php the_permalink(); ?>"> <?php echo get_the_title(); ?> </a> </h1> <?php the_content(); ?> </article>

WordPress Functions ★ Read the Codex:

WordPress Functions ★ Read the Codex: ★ codex.wordpress.org

WordPress Functions ★ Read the Codex: ★ codex.wordpress.org ★ Learn
the template hierarchy

the template hierarchy ★ codex.wordpress.org/Template_Hierarchy

the template hierarchy ★ codex.wordpress.org/Template_Hierarchy ★ Make a child theme to hack on

the template hierarchy ★ codex.wordpress.org/Template_Hierarchy ★ Make a child theme to hack on ★ codex.wordpress.org/Child_Themes

WordPress Functions ★ Learn the template tags (functions):

WordPress Functions ★ Learn the template tags (functions): ★ codex.wordpress.org/Template_Tags

?> Matt Wiebe @mattwiebe wp.mattwie.be Design Engineer Automattic / WordPress.com

PHP For Absolute Beginners

PHP For Absolute Beginners

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