Slide 1
Slide 1 text
PHP for WordPress
Zac Gordon
@zgordon
Slide 2
Slide 2 text
What is PHP?
Slide 3
Slide 3 text
Many Developers
Learn PHP via WP
Slide 4
Slide 4 text
Often Starts with
Theme Customization
Slide 5
Slide 5 text
Some Examples of
PHP Theme Customization
Slide 6
Slide 6 text
What to Know
Before Learning PHP
Slide 7
Slide 7 text
What to Know
About PHP for WordPress
Slide 8
Slide 8 text
• Language Basics
• WP Coding Standards
• Common Files
• The Loop
• Template Tags
• Conditionals
• Hooks
What to Know About
PHP for WordPress
Slide 9
Slide 9 text
• Syntax
• Variables
• Operators
• Conditionals
• Loops
• Functions
• Objects
PHP Language Basics
Slide 10
Slide 10 text
Learn PHP Basics
In 4 Hours at CodeAcademy
For Free codecademy.com
Slide 11
Slide 11 text
Learn PHP
In 4 Hours on CodeAcademy
For Free!!!
Slide 12
Slide 12 text
Ways of Writing PHP
in WordPress Files
Slide 13
Slide 13 text
Welcome Home!”;
}
?>
HTML in PHP
example-1.php
Slide 14
Slide 14 text
”>
PHP in HTML
example-2.php
Slide 15
Slide 15 text
• Syntax
• Variables
• Operators
• Conditionals
• Loops
• Functions
• Objects
PHP Language Basics
Slide 16
Slide 16 text
Learn PHP Basics
In 4 Hours at CodeAcademy
For Free codecademy.com
Slide 17
Slide 17 text
WordPress has PHP
Coding Standards
https://make.wordpress.org/core/handbook/best-practices/coding-standards/php/
Slide 18
Slide 18 text
function myCustomFunction() {}
function my_custom_function() {}
WordPress has PHP
Coding Standards
if(is_single()):
if ( is_single() ) :
the_title(‘h2’,’h3’)
the_title( ‘h2’, ‘h2’ )
Slide 19
Slide 19 text
Common PHP
Theme Files
Slide 20
Slide 20 text
• header.php
• footer.php
• functions.php
• page.php, single.php
• front-page.php, home.php
• category.php, archive.php
Common Theme Files
Slide 21
Slide 21 text
Template Hierarchy
http://wphierarchy.com/
Slide 22
Slide 22 text
Archives
Custom Posts
Miscellaneous
Hierarchy Review
How They Work
Core Files
Homepages
Pages and Posts
Template Hierarchy Course
at Treehouse
http://teamtreehouse.com/library/the-wordpress-template-hierarchy
Slide 23
Slide 23 text
Why Learn
The Loop?
Slide 24
Slide 24 text
Oh No!!!
There is no content for this page
The LoopSlide 25
Slide 25 text
‘portfolio’,
‘category_name’ => ‘featured’,
‘posts_per_page’ => 4
);
$query = new WP_Query( $args );
?>
Custom Loops with WP_Query
have_posts() ) : while( $query->have_posts() ) :
$query->the_post(); ?>
Slide 26
Slide 26 text
Including Files
Slide 27
Slide 27 text
Including Files
get_template_part( 'content', 'page' );
Loads: content-page.php
get_template_part( 'custom' );
Loads: custom.php
get_template_part( ‘lib/my’ ‘file’ );
Loads: /lib/my-file.php
Slide 28
Slide 28 text
• Language Basics
• WP Coding Standards
• Common Files
• The Loop
• Template Tags
• Conditionals
• Hooks
What to Know About
PHP for WordPress
Slide 29
Slide 29 text
Template Tags
Get You What You Need
Slide 30
Slide 30 text
• the_title()
• the_content()
• the_author()
• the_category()
• the_time()
Examples of
Template Tags
https://codex.wordpress.org/Template_Tags
Slide 31
Slide 31 text
the_time( 'F j, Y' );
September 12, 2015
Some Template Tags
Take Parameters
https://codex.wordpress.org/Function_Reference/the_time
the_time( ‘n/j/y’ );
09/12/15
the_time( ‘l g:i a’ );
Saturday 9:00 am
Slide 32
Slide 32 text
Template Tag
Documentation
Slide 33
Slide 33 text
One More
bloginfo()
Slide 34
Slide 34 text
bloginfo( 'name' );
Site Name
Get Information
About WordPress Install
https://codex.wordpress.org/Function_Reference/bloginfo
bloginfo( ‘description’ );
Site Description
bloginfo( ‘url’ );
http://siteurl.com
Slide 35
Slide 35 text
https://codex.wordpress.org/
Template_Tags
Slide 36
Slide 36 text
• Language Basics
• WP Coding Standards
• Common Files
• The Loop
• Template Tags
• Conditionals
• Hooks
What to Know About
PHP for WordPress
Slide 37
Slide 37 text
Welcome Home!
Conditional Statements https://codex.wordpress.org/Conditional_TagsSlide 38
Slide 38 text
Welcome Home!”;
}
?>
Conditional Statements
https://codex.wordpress.org/Conditional_Tags
Slide 39
Slide 39 text
• is_page(), is_page( ‘about‘ )
• is_category()
• is_author()
• wp_is_mobile()
• is_main_query()
• is_woocommerce()
• is_shop(), is_cart()
Conditional Statements
https://codex.wordpress.org/Conditional_Tags
Slide 40
Slide 40 text
Can Also Do Not
!is_single()
Slide 41
Slide 41 text
if ( is_front_page() ) {
} elseif ( is_page( ‘about’ ) {
} else {
}
Multiple Conditions
Slide 42
Slide 42 text
function get_the_archive_title() {
if ( is_category() ) {
$title = sprintf( __( 'Category: %s' ),
single_cat_title( '', false ) );
} elseif ( is_tag() ) {
$title = sprintf( __( 'Tag: %s' ),
single_tag_title( '', false ) );
} elseif ( is_author() ) {
$title = sprintf( __( 'Author: %s' ), '' . get_the_author() . '' );
} elseif ( is_year() ) {
$title = sprintf( __( 'Year: %s' ),
get_the_date( _x( 'Y', 'yearly archives date
format' ) ) );
} elseif ( is_month() ) {
Slide 43
Slide 43 text
• Language Basics
• WP Coding Standards
• Common Files
• The Loop
• Template Tags
• Conditionals
• Hooks
What to Know About
PHP for WordPress
Slide 44
Slide 44 text
Hooks Let You Do
Anything, Anywhere, Anytime
In WordPress
Slide 45
Slide 45 text
Filters vs Actions
Slide 46
Slide 46 text
“Anything, Anywhere, Anytime”
Filters
}
Slide 47
Slide 47 text
“Anything, Anywhere, Anytime”
Actions
}
Slide 48
Slide 48 text
Filters modify something
Slide 49
Slide 49 text
Actions do something
Slide 50
Slide 50 text
A Few Examples of
Actions and Filters
Slide 51
Slide 51 text
function excerpt_length_example( $length ) {
return 15;
}
add_filter( 'excerpt_length', 'excerpt_length_example' );
Slide 52
Slide 52 text
function body_class_example( $classes ) {
if( is_single() ) {
foreach( get_the_category( get_the_ID() ) as $cat )
$classes[] = 'cat-' . $cat->category_nicename;
}
return $classes;
}
add_filter( 'body_class', 'body_class_example' );
Slide 53
Slide 53 text
function register_my_menus() {
register_nav_menus(
array(
'footer_menu' => __( 'Footer Menu', 'mytheme' )
)
);
}
add_action( 'init', 'register_my_menus' );
Slide 54
Slide 54 text
function my_plugin_page() {
add_options_page(
'Page Title',
‘Menu Title',
'manage_options',
‘plugin-slug',
‘my_plugin_page_init’ );
}
add_action( 'admin_menu' , 'my_plugin_page' );
Slide 55
Slide 55 text
function publish_post_to_slack( ) {
// Connect to Slack API
}
add_action( 'save_post', ‘publish_post_to_slack’ );
Slide 56
Slide 56 text
http://codex.wordpress.org/Plugin_API/Filter_Reference
http://codex.wordpress.org/Plugin_API/Action_Reference
Slide 57
Slide 57 text
http://codex.wordpress.org/Plugin_API/Action_Reference
Runtime
Slide 58
Slide 58 text
Where to Learn
All of This, Again
Slide 59
Slide 59 text
Language Basics
CodeAcademy
Slide 60
Slide 60 text
WP Coding Standards
make.wordpress.org
Slide 61
Slide 61 text
Common Files
wphierarchy.com
Slide 62
Slide 62 text
The Loop
codex.wordpress.org/The_Loop
Slide 63
Slide 63 text
Template Tags
codex.wordpress.org/Template_Tags
Slide 64
Slide 64 text
Conditional Tags
codex.wordpress.org/Conditional_Tags
Slide 65
Slide 65 text
Hooks
Treehouse Hooks Course
Slide 66
Slide 66 text
Be Practical
In Your Learning
Slide 67
Slide 67 text
Zac Gordon
wp.zacgordon.com
@zgordon
https://teamtreehouse.com/learn/wordpress