WP Hooks

function fb_filter_query( $query, $error = true ) {
    
    if ( is_search() ) {
        $query->is_search = false;
        $query->query_vars[s] = false;
        $query->query[s] = false;
        
        // to error
        if ( $error == true )
            $query->is_404 = true;
    }
}

add_action( 'parse_query', 'fb_filter_query' );
add_filter( 'get_search_form', create_function( '$a', "return null;" ) );

add_action( 'widgets_init', 'remove_register_sidebar_widgets', 11 );
function remove_register_sidebar_widgets(){
	unregister_sidebar( 'sidebar-1' );
	unregister_sidebar( 'sidebar-2' );
	unregister_sidebar( 'sidebar-3' );
}

function my_pre_get_posts( $query ) {
	// do not modify queries in the admin
	if( is_admin() ) {	
		return $query;	
	}
	
	// only modify queries for 'event' post type
	if( isset($query->query_vars['post_type']) && $query->query_vars['post_type'] == 'event' ) {
		$query->set('orderby', 'meta_value');	
		$query->set('meta_key', 'p_start_date');	 
		$query->set('order', 'ASC'); 		
	}
		// return
	return $query;

}

add_action('pre_get_posts', 'my_pre_get_posts');

 if(function_exists(acf_add_options_page))
{
	acf_add_options_sub_page(array(
	  'page_title'  => 'Theme General Settings',
	  'menu_title' => 'Theme Settings',
	  'parent_slug' => 'themes.php',
	  'menu_slug'  => 'theme-general-settings',
	  'capability' => 'edit_posts',
	  'redirect'  => false
	));
}

add_action( 'add_meta_boxes', 'post_disable_enable' );
function post_disable_enable() {
add_meta_box('post_disable_enable', 'Post Disable Enable', 'post_disable_enable_meta', 'post' );
}
function post_disable_enable_meta( $post ) {
	wp_nonce_field( 'post_disable_enable', 'post_disable_enable_nonce' );
	$value = get_post_meta( $post->ID, 'post_disable_enable', true );
	echo '<input type="radio" name="post_disable_enable" value="disable" ';
    	if($value=='disable') {
			echo 'checked';
		}
	'> Disable<br/>';
	echo '<input type="radio" name="post_disable_enable" value="enable" ';
		if($value=='enable') {
			echo 'checked';
		}
	echo '> Enable<br/>';
  }
  
add_action( 'save_post', 'disable_enable_save_meta_box_data' );
function disable_enable_save_meta_box_data( $post_id ) {
	// Check if our nonce is set.

	if ( !isset( $_POST['post_disable_enable_nonce'] ) ) {
  	return;
  	}
	// Verify that the nonce is valid.
	if ( !wp_verify_nonce( $_POST['post_disable_enable_nonce'], 'post_disable_enable' ) ) {
	return;
	}
	// If this is an autosave, our form has not been submitted, so we don't want to do anything.
	if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
  	return;
  	}
  	// Check the user's permissions.
	if ( !current_user_can( 'edit_post', $post_id ) ) {
	return;
	}
  	// Sanitize user input.
  	$new_meta_value = ( isset( $_POST['post_disable_enable'] ) ? sanitize_html_class( $_POST['post_disable_enable'] ) : '' );
	// Update the meta field in the database.
	update_post_meta( $post_id, 'post_disable_enable', $new_meta_value );
  }

Step 1: Configuration define in wp-config.php

define('WP_ADMIN_DIR', 'private-area');
define( 'ADMIN_COOKIE_PATH', SITECOOKIEPATH . WP_ADMIN_DIR); 

Step 2: Add a function in your theme functions.php file

add_filter('site_url',  'change_wpadmin_url', 10, 3);  
function change_wpadmin_url( $url, $path, $orig_scheme ) {
	$old_admin_url  = array( "/(wp-admin)/");
	$admin_dir = WP_ADMIN_DIR;
	$new_admin_url  = array($admin_dir);
	return preg_replace( $old_admin_url, $new_admin_url, $url, 1); 
}

Step 3: Add a line to .htaccess file

RewriteRule ^private-area/(.*) wp-admin/$1?%{QUERY_STRING} [L]

add_action( 'pre_get_posts',  'set_posts_per_page'  );
function set_posts_per_page( $query ) {
    global $wp_the_query;
    if ( ( ! is_admin() ) && ( $query === $wp_the_query ) && ( $query->is_search() ) ) {
    	$query->set( 'posts_per_page', 10 );
    }
    elseif ( ( ! is_admin() ) && ( $query === $wp_the_query ) && ( $query->is_category() ) ) {
    	$query->set( 'posts_per_page', 10 );
    }
    return $query;
} 
 

add_filter('wp_mail_from', 'new_mail_from');
add_filter('wp_mail_from_name', 'new_mail_from_name');
function new_mail_from($old) {
    return 'admin@example.com';
}
function new_mail_from_name($old) {
    return 'DS Web Solutions';
}
 

function dsweb_email_content_type(){
return "text/html";
}
add_filter( 'wp_mail_content_type','dsweb_email_content_type' );

add_filter( 'plugin_action_links', 'disable_plugin_deactivation', 10, 4 );
function disable_plugin_deactivation( $actions, $plugin_file, $plugin_data, $context ) {
    // Remove edit link for all
    if ( array_key_exists( 'edit', $actions ) )
        unset( $actions['edit'] );
    // Remove deactivate link for crucial plugins
    if ( array_key_exists( 'deactivate', $actions ) && in_array( $plugin_file, array(
        'json-rest-api/plugin.php'
    )))
        unset( $actions['deactivate'] );
    return $actions;
}

function dswebsolutions_preview_link() {
    $site_url = site_url();
    $mydir = $site_url.'/preview-page/'.get_the_ID(); 
    return "$mydir";
}
add_filter( 'preview_post_link', 'dswebsolutions_preview_link' ); 

function remove_cssjs_ver( $src ) {
    if( strpos( $src, '?ver=' ) )
    $src = remove_query_arg( 'ver', $src );
    return $src;
}
add_filter( 'style_loader_src', 'remove_cssjs_ver', 10, 2 );
add_filter( 'script_loader_src', 'remove_cssjs_ver', 10, 2 );

remove_action( 'wp_head', 'vh_shortocde' );

 //Add Registration fields to the form 
add_filter( 'register_form', 'adding_custom_registration_fields' );
function adding_custom_registration_fields( ) {
        echo '<div class="form-row form-row-wide"><label for="reg_role">'.__('Role', 'woocommerce').' <span class="required">*</span></label>';
        echo '<select name="wp_capabilities">
        <option value="customer">Customer</option>
        <option value="designer">Designer</option>
        </select>';
        echo '</div>';
 }
  

//Validation registration form  after submission using the filter registration_errors
add_filter('registration_errors', 'registration_errors_validation', 10,3);
function registration_errors_validation($reg_errors, $sanitized_user_login, $user_email) {
    global $woocommerce;
    extract($_POST); // extracting $_POST into separate variables
    if($wp_capabilities == '' ) {
    $woocommerce->add_error( __( 'Please, fill in all the required fields.', 'woocommerce' ) );
    }
    return $reg_errors;
}

//Updating use meta after registration successful registration
add_action('woocommerce_created_customer','adding_extra_reg_fields');
function adding_extra_reg_fields($user_id) {
extract($_POST);
// update user role using wordpress function
wp_update_user( array ('ID' => $user_id, 'role' => $wp_capabilities ) ) ;
}

// ADD NEW COLUMN
add_filter( 'manage_edit-product_columns', 'show_product_columns',15 );
function show_product_columns($columns){
//remove column
        unset($columns['sku']);
        unset($columns['product_tag']);
        unset($columns['product_type']);
//add column
        $columns['author'] = __( 'Author');
        return $columns;
}

add_action( 'manage_product_posts_custom_column', 'product_column_author', 10, 2 );
function product_column_author( $column, $postid ) {
    if ( $column == 'author' ) {
    echo $postid;
    }
}

add_filter('admin_init', 'my_general_settings_on_dswebsolution');
function my_general_settings_on_dswebsolution()
{
    register_setting('general', 'general_field_dswebsolution', 'esc_attr');
    add_settings_field('general_field_dswebsolution', '<label for="general_field_dswebsolution">'.__('General Field Name' , 'general_field_dswebsolution' ).'</label>' , 'my_general_settings_dswebsolution_html', 'general');
}
function my_general_settings_dswebsolution_html()
{
    $value = get_option( 'general_field_dswebsolution', '' );
    echo '<input type="text" id="general_field_dswebsolution" name="general_field_dswebsolution" value="' . $value . '" />';
}

$result = add_role( 'designer', __('Designer' ),
	array(
    	    'read' => true, // true allows this capability
            'edit_posts' => true, // Allows user to edit their own posts
            'edit_pages' => true, // Allows user to edit pages
            'edit_others_posts' => true, // Allows user to edit others posts not just their own
            'create_posts' => true, // Allows user to create new posts
            'manage_categories' => true, // Allows user to manage post categories
            'publish_posts' => true, // Allows the user to publish, otherwise posts stays in draft mode
            'edit_themes' => false, // false denies this capability. User can't edit your theme
            'install_plugins' => false, // User cant add new plugins
            'update_plugin' => false, // User can't update any plugins
            'update_core' => false // user cant perform core updates
            )
       );

function unapproved_post_status(){
    register_post_status( 'unapproved', array(
    'label'                     => _x( 'Unapproved', 'post' ),
    'public'                    => true,
    'exclude_from_search'       => false,
    'show_in_admin_all_list'    => true,
    'show_in_admin_status_list' => true,
    'label_count'               => _n_noop('Unapproved <span class="count">(%s)</span>', 'Unapproved <span class="count">(%s)</span>' ), ) );
}
add_action( 'init', 'unapproved_post_status' );

add_filter( 'woocommerce_currencies', 'add_inr_currency');
add_filter( 'woocommerce_currency_symbol', 'add_inr_currency_symbol');
function add_inr_currency( $currencies ) {
$currencies['INR'] = 'INR';
return $currencies;
}
function add_inr_currency_symbol( $symbol ) {
$currency = get_option( 'woocommerce_currency' );
switch( $currency ) {
case 'INR': $symbol = 'Rs.'; break;
}
return $symbol;
}

add_action('wp_head', 'dsweb_show_template');
function dsweb_show_template() {
global $template;
print_r($template);
}