wordpress.cmds.txt

>>> Wordpress Theme Development <<<<<<




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Keys: short code, plugin, widget, Short Code in Custom Page,



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Topics: 


[Theme Functions: functions.php : Register Options to Admin: Examples](#theme-functions)

[What Is a WordPress Database Table?](#wp-database)

[Child Theme](#chile-theme)

[Child Theme](#chile-theme)

[Child Theme](#chile-theme)

[Child Theme](#chile-theme)

[Child Theme](#chile-theme)

[Child Theme](#chile-theme)






Making Theme: 

-----
Default Page: page.php
Blog Page: index.php
Custom Design: template

For Admin: functions.php
-----


Insert HTMT to Wordpress Theme

User Wordpress Functions: 
Calling: 

<?php echo get_template_directory_uri(); ?>
<?php echo bloginfo(); ?>

<?php echo get_header(); ?>

<?php echo get_footer(); ?>
<?php echo the_title(); ?>



//Header file name: header.php
<?php echo get_header(''); ?>

//Header file name: header-inner.php
<?php echo get_header('inner'); ?>


//Header file name: footer.php
<?php echo get_footer()?>

//Header file name: footer-inner.php
<?php echo get_footer('inner'); ?>

<?php site_url(); ?>
<?php the_content(); ?>
<?php echo get_the_content(); ?>
<?php the_post(); ?>

<?php the_post_thumbnail(); ?>
<?php wp_get_attachment_image_src(get_post_thumbnail_id(), 'large'; ?>



----------------------------------------------------------------------
------------------------------------------------------------------------------

What is functions.php?

The functions.php file behaves like a WordPress plugin, adding features and functionality to a WordPress site.
 You can use it to call WordPress functions and to define your own functions.

-------------------------------------------------------------------------------
---------------------------------------------------------------------
//Register a New Menu in Wordpress

<?php echo register_nav_menu(); ?>
<?php echo wp_nav_menu(); ?>

File: funtions.php


//Showing options in admin
functions.php 

<?php

regiter_nav_menus(
        array('primary-menu'=>'Top Menu'
)


add_theme_support('post-thumbnails');


//Admin mein image add hogi
<?php add_theme_support('custom-header'); ?>

?>





Calling: 

<div class="menu-bar">
     <?php wp_nav_menu(array('
           theme_location'=>'primary-menu'
           ,'menu_class'=>'nav')) ?>
           )) ?>
</div>

------------------------------------------------------------

How to call default page template in wordpress

File: page.php



------------------------------------------------------------

<?php 
  $logoimg = get_header_image(); 
?>





-----------------------------------------------------------------------------

Theme Functions

    Automatic Feed Links.
    Navigation Menus.
    Load Text Domain.
    Post Thumbnails.
    Post Formats.
    Theme support in block themes.
    Initial Setup Example.

------------------------------------------------------------------------------


#
[Top](#top)
<a name="theme-functions"></a>

*Theme Functions: functions.php : Register Options to Admin


What is functions.php?

The functions.php file behaves like a WordPress plugin, adding features and functionality to a WordPress site.
 You can use it to call WordPress functions and to define your own functions.


Examples:

<code>
function load_stylesheets()
{
    wp_register_style('style_css', get_template_directory_uri() . '/style.css');
    wp_enqueue_style('style_css');

}
add_action( 'wp_enqueue_scripts',  'load_stylesheets');
</code>


Theme Setup

A number of theme features should be included within a “setup” function that runs initially when your theme is activated. As shown below, each of these features can be added to your functions.php file to activate recommended WordPress features.

To create this initial function, start a new function entitled myfirsttheme_setup(), like so:

<code>
if ( ! function_exists( 'myfirsttheme_setup' ) ) :
/**
 * Sets up theme defaults and registers support for various WordPress  
 * features.
 *
 * It is important to set up these functions before the init hook so
 * that none of these features are lost.
 *
 *  @since MyFirstTheme 1.0
 */
function myfirsttheme_setup() { ... }
</code>


Automatic Feed Links

Automatic feed links enables post and comment RSS feeds by default. These feeds will be displayed in <head> automatically. They can be called using add_theme_support() in classic themes. This feature is automatically enabled for block themes, and does not need to be included during theme setup.


	add_theme_support( 'automatic-feed-links' );



Navigation Menus: 

<code>
register_nav_menus( array(
    'primary'   => __( 'Primary Menu', 'myfirsttheme' ),
    'secondary' => __( 'Secondary Menu', 'myfirsttheme' )
) );

</code>



Load Text Domain: 

<code>
load_theme_textdomain( 'myfirsttheme', get_template_directory() . '/languages' );
</code>


Post Thumbnails: 

<code>
add_theme_support( 'post-thumbnails' );
</code>



Post Formats: 

<code>
add_theme_support( 'post-formats',  array( 'aside', 'gallery', 'quote', 'image', 'video' ) );
</code>



Theme support in block themes: 

<code>
add_theme_support( 'post-thumbnails' );
add_theme_support( 'responsive-embeds' );
add_theme_support( 'editor-styles' );
add_theme_support( 'html5', array( 'style','script' ) );
add_theme_support( 'automatic-feed-links' ); 
</code>



Initial Setup Example: 

<code>
if ( ! function_exists( 'myfirsttheme_setup' ) ) :
	/**
	 * Sets up theme defaults and registers support for various
	 * WordPress features.
	 *
	 * Note that this function is hooked into the after_setup_theme
	 * hook, which runs before the init hook. The init hook is too late
	 * for some features, such as indicating support post thumbnails.
	 */
	function myfirsttheme_setup() {

    /**
	 * Make theme available for translation.
	 * Translations can be placed in the /languages/ directory.
	 */
		load_theme_textdomain( 'myfirsttheme', get_template_directory() . '/languages' );

		/**
		 * Add default posts and comments RSS feed links to <head>.
		 */
		add_theme_support( 'automatic-feed-links' );

		/**
		 * Enable support for post thumbnails and featured images.
		 */
		add_theme_support( 'post-thumbnails' );

		/**
		 * Add support for two custom navigation menus.
		 */
		register_nav_menus( array(
			'primary'   => __( 'Primary Menu', 'myfirsttheme' ),
			'secondary' => __( 'Secondary Menu', 'myfirsttheme' ),
		) );

		/**
		 * Enable support for the following post formats:
		 * aside, gallery, quote, image, and video
		 */
		add_theme_support( 'post-formats', array( 'aside', 'gallery', 'quote', 'image', 'video' ) );
	}
endif; // myfirsttheme_setup
add_action( 'after_setup_theme', 'myfirsttheme_setup' );

</code>



Content Width: 

<code>
if ( ! isset ( $content_width) ) {
    $content_width = 800;
}
</code>



Other Features: 


    Custom Headers -Classic themes
    Sidebars (widget areas) -Classic themes
    Custom Background -Classic themes
    Title tag -Classic themes
    Add Editor Styles
    HTML5 -Classic themes




Your functions.php File: 

<code>
/**
 * MyFirstTheme's functions and definitions
 *
 * @package MyFirstTheme
 * @since MyFirstTheme 1.0
 */

/**
 * First, let's set the maximum content width based on the theme's
 * design and stylesheet.
 * This will limit the width of all uploaded images and embeds.
 */
if ( ! isset( $content_width ) ) {
	$content_width = 800; /* pixels */
}


if ( ! function_exists( 'myfirsttheme_setup' ) ) :

	/**
	 * Sets up theme defaults and registers support for various
	 * WordPress features.
	 *
	 * Note that this function is hooked into the after_setup_theme
	 * hook, which runs before the init hook. The init hook is too late
	 * for some features, such as indicating support post thumbnails.
	 */
	function myfirsttheme_setup() {

		/**
		 * Make theme available for translation.
		 * Translations can be placed in the /languages/ directory.
		 */
		load_theme_textdomain( 'myfirsttheme', get_template_directory() . '/languages' );

		/**
		 * Add default posts and comments RSS feed links to <head>.
		 */
		add_theme_support( 'automatic-feed-links' );

		/**
		 * Enable support for post thumbnails and featured images.
		 */
		add_theme_support( 'post-thumbnails' );

		/**
		 * Add support for two custom navigation menus.
		 */
		register_nav_menus( array(
			'primary'   => __( 'Primary Menu', 'myfirsttheme' ),
			'secondary' => __( 'Secondary Menu', 'myfirsttheme' ),
		) );

		/**
		 * Enable support for the following post formats:
		 * aside, gallery, quote, image, and video
		 */
		add_theme_support( 'post-formats', array( 'aside', 'gallery', 'quote', 'image', 'video' ) );
	}
endif; // myfirsttheme_setup
add_action( 'after_setup_theme', 'myfirsttheme_setup' );

</code>




#
[Top](#top)
<a name="child-theme"></a>

*Child Theme


Create a style.css in the child theme folder

style.css

<code>
/* 
Theme Name: Twenty Seventeen Child 
Theme URI: http://yourdomain.com
Description: Twenty Seventeen Child 
Theme Author: Your Name
Author URI: http://yourdomain.com
Template: twentyseventeen 
Version: 1.0.0
Text Domain: twentyseventeen-child
License: GNU General Public License or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Tags: light, dark, two-columns, right-sidebar, responsive-layout, accessibility-ready
*/
</code>


Create a PHP file named functions.php in the child theme’s directory: 

<code>
<?php
add_action( 'wp_enqueue_scripts', 'enqueue_parent_styles' );
function enqueue_parent_styles() {
   wp_enqueue_style( 'parent-style', get_template_directory_uri().'/style.css' );
}
?>
</code>



Change the background color: 

<code>
.site-content-contain {
    background-color: #DEF0F5;
    position: relative;
}
</code>


Change Side Bar Color: 

<code>
.widget {
background: #B9EBFA;
padding: 25px;
}
</code>



Changing Font Types, Sizes, and Colors: 

<code>
p {
color: teal;
}
p {
font-family: Georgia;
font-size: 18px;
}
</code>



Entry Title: 

<code>
.entry-title a {
    color: #333;
    text-decoration: none;
    margin-left: -2px;
}
</code>



page.php: 

<code>
get_template_part( 'template-parts/page/content', 'page' );
</code>


#

[Top](#top)
<a name="wp-database"></a>

*What Is a WordPress Database Table?

A database stores data in the form of tables. Each table consists of unique data displayed in columns and rows that contain more specific pieces of information or parameters.

By default, a WordPress database contains the following tables;

    	wp_commentmeta – keeps the metadata of each comment posted on the website.
   	wp_comments – stores data related to user comments, including the author name, URL, IP address, email, and comment content.
   	wp_links – it was used for holding information from the Links feature. Since the feature has been deprecated, this table is often empty.

	wp_options – contains WordPress configuration settings, such as website URL, default category, and posts per page.
	wp_postmeta – keeps metadata of each post on the site, such as custom fields.
	wp_posts – stores data from articles, custom post types, pages, and navigation menu items.
	wp_termmeta – stores metadata of the terms.
	wp_terms – contains the WordPress terms for each post tag and category.
	wp_term_relationships – maintains the association between posts and terms in the wp_terms table.
	wp_term_taxonomy – describes the taxonomy for each category, link, and tag in the wp_terms table.

#

How to fetch data from database using MySqli or $wpdb  (Code Not Tested)

<code>
$results = $wpdb->get_results( "SELECT * FROM $table_name"); // Query to fetch data from database table and storing in $results
if(!empty($results))                        // Checking if $results have some values or not
{    
    echo "<table width='100%' border='0'>"; // Adding <table> and <tbody> tag outside foreach loop so that it wont create again and again
    echo "<tbody>";      
    foreach($results as $row){   
    $userip = $row->user_ip;               //putting the user_ip field value in variable to use it later in update query
    echo "<tr>";                           // Adding rows of table inside foreach loop
    echo "<th>ID</th>" . "<td>" . $row->id . "</td>";
    echo "</tr>";
    echo "<td colspan='2'><hr size='1'></td>";
    echo "<tr>";        
    echo "<th>User IP</th>" . "<td>" . $row->user_ip . "</td>";   //fetching data from user_ip field
    echo "</tr>";
    echo "<td colspan='2'><hr size='1'></td>";
    echo "<tr>";        
    echo "<th>Post ID</th>" . "<td>" . $row->post_id . "</td>";
    echo "</tr>";
    echo "<td colspan='2'><hr size='1'></td>";
    echo "<tr>";        
    echo "<th>Time</th>" . "<td>" . $row->time . "</td>";
    echo "</tr>";
    echo "<td colspan='2'><hr size='1'></td>";
    }
    echo "</tbody>";
    echo "</table>"; 

}
</code>

#
To update time field on if condition:

if($userip==245.356.134.22){  //Checking if user_ip field have following value
$wpdb->update( 
$table_name, 
array( 
    'time' => 'YOUR NEW TIME' // Entring the new value for time field
),      
array('%d')                   // Specify the datatype of time field
);
}


Update

If you want to check if the IP you are going to insert in database is already exist or not then check it like this

<code>
global $wpdb,$ip;
$results = $wpdb->get_results( "SELECT user_ip FROM $table_name");  //query to fetch record only from user_ip field

$new_ip = 245.356.134.22;   //New Ip address storing in variable

if(!empty($results))                       
{    
    foreach($results as $row){  
    $old_ip = $row->user_ip;        // putting the value of user_ip field in variable
    if($new_ip==$old_ip){           //  comparing new ip address with old ip addresses
      $ip = 'Already Exist';        // if ip already exist in database then assigning some string to variable
    }
    }

}
if($ip = 'Already Exist'){          // Checking if variable have some string (It has some string only when if IP already exist in database as checked in if condition by comparing old ips with new ip)
//Insert query according to Ip already exist in database
}else{
//Insert query according to Ip doesn't exist in database
}
</code>

#

<code>
//For fetching data use
global $wpdb;
$results = $wpdb->get_results("SLECT * FROM table_name"); 
//and for update use below code 
$wpdb->update( 
  $table_name, 
  array( 
    'time' => time(),   // string
  ), 
  array( 'user_ip' => '245.356.134.22' ), 
  array('%s'), 
  array( '%d' )
);
</code>

#
<code>
$wpdb->update($table_name , array('user_ip' => $user_ip, 'post_id' =>$postID, 'time' => $visittime),array('%s','%d', '%d') );
$results = $wpdb->get_results("SELECT * FROM table_name"); 
</code>

#



*Database Application Programming Interface (API)


    get_comments()
    get_pages()
    get_posts()
    get_results()
    get_row()
    get_users()
    get_var()


#

# Short Code in wordpress

  In functions.php file:

   function my_shortcode {

      $message = "<h1>This short code</h1>";

      return $message;
   }

  //Register Short Code,  Using:  [greeting]

   add_shortcode('greeting', 'my_shortcode') 


#

# Using Short Code In Custom Page in Wordpress (In Child Theme)
 //Short Code in Custom Page

<?php
  /* Template Name: Contact Us */
  get_header();
?>

   <h1>Contact Us</h1>
   <?php echo do_shortcode("[greeting]"); ?>


<?php

 get_footer();

?>



#
# Widged in Wordpress

 In functions.php file

 function header_widget() {
   register_sidebar(array(
     
     'name' => 'Header Widget',
     'id' => 'header_widget',
     'description' => 'will be displayed in the Header',
     'before_widget' => '<div class="heade_widget">'
     'after_widget' => '</div>',
     'before_title' => '<h2 class="widget_title"></h2>',
     'after_widget' => '</h2>',     
     
   ));
 }

  //Wordpress hook
  add_action('widget_init','header_widget');   

//Put this code in any file example header.php 

  <?php if(is_active_sidebar('header_widget)) :?>
  <div class="head_wrap">
    <?php dynamic_sidebar('header_widget') ?>
  </div>
  <?php endif; ?>




#
:end: