Powerful WordPress Tips And Tricks

wp_tips_tricks.php

<?php
/* Replace Built-In Scripts By Deregistering Them */
function my_scripts_method() {
	wp_deregister_script( 'jquery' );
	wp_register_script( 'jquery', get_template_directory_uri() . '/js/jquery-new.js');
	wp_enqueue_script( 'jquery' );
}
add_action('wp_enqueue_scripts', 'my_scripts_method');

/* Force Perfect JPG Images */
add_filter( 'jpeg_quality', 'smashing_jpeg_quality' );
function smashing_jpeg_quality() {
	return 100;
}

/* FeedBurner Redirection */
add_action( 'template_redirect' , 'smashing_rss_redirect');
function smashing_rss_redirect() {
	if ( is_feed() AND !preg_match( '/feedburner|feedvalidator/i', $_SERVER['HTTP_USER_AGENT'] ) ){
		header( 'Location: http://feeds.feedburner.com/my_smashing_feed' );
		header( 'HTTP/1.1 302 Temporary Redirect' );
	}
}

/* Setting Up Sessions In WordPress */
add_action( 'init', 'smashing_session_start' );
function smashing_session_start() {
	if ( !session_id() ) {
		session_start();
	}
}

/* List All Hooked Functions */
function list_hooked_functions($tag=false){
	global $wp_filter;
	if ($tag) {
		$hook[$tag]=$wp_filter[$tag];
		if (!is_array($hook[$tag])) {
			trigger_error("Nothing found for '$tag' hook", E_USER_WARNING);
			return;
		}
	}
	else {
		$hook=$wp_filter;
		ksort($hook);
	}
	
	echo '<pre>';
	
	foreach($hook as $tag => $priority){
		echo "<br />&gt;&gt;&gt;&gt;&gt;\t<strong>$tag</strong><br />";
		ksort($priority);
		foreach($priority as $priority => $function){
			echo $priority;
			foreach($function as $name => $properties) {
				echo "\t$name<br />";
			}
		}
	}
	echo '</pre>';
	return;
}

/* Automatically Add Paragraph Tags To Anything */
remove_filter( 'the_content', 'wpautop' );
remove_filter( 'the_excerpt', 'wpautop' );

/* Send Emails Using WordPress */
$message = 'Hello, thanks for reading my post! I hope to see you back soon.';
wp_mail( '[email protected]', 'Thanks for reading my post!', $message);
add_filter ("wp_mail_content_type", "smashing_mail_content_type");
function smashing_mail_content_type() {
	return "text/html";
}

/* Native Pagination Links */
// Pagination for a WordPress loop
$list = new WP_Query( $query_args );
$pagination = array(
	'base'       => str_replace( 99999, '%#%', get_pagenum_link( 99999 ) ),
	'format'     => '?paged=%#%',
	'current'    => max( 1, get_query_var( 'paged' ) ),
	'total'      => $list->max_num_pages,
	'next_text'  => 'next',
	'prev_text'  => 'previous'
);
echo '<div class="pagination primary-links">' . paginate_links( $pagination ) . '</div>';

// Pagination for anything
$list = range(1, 100);
$items_per_page = 12;
$pagination = array(
	'base'       => get_bloginfo( 'url' ) . '/mypage/%_%',
	'format'     => '?paged=%#%',
	'current'    => $_GET['current_page'],
	'total'      => ceil( max($list) / $items_per_page ),
	'next_text'  => 'go forth',
	'prev_text'  => 'go back'
);
echo '<div class="pagination primary-links">' . paginate_links( $pagination ) . '</div>';

/* Upload Files With Ease */
$upload = wp_upload_bits( $_FILES['myfile']['name'], null, file_get_contents( $_FILES['myfile']['tmp_name'] ) );
echo 'Well uploaded! The path to this file is ' . $upload['file'] . ' and the url to this file is ' . $upload['url'];

/* Twitter-Like Time Display */
$diff = human_time_diff( '2012-05-05 12:05:00', '2012-05-05 12:10:00' );
echo 'This comment was submitted ' . $diff . 'ago';

/* Log In As Any User */
$user_id = 4;
wp_set_auth_cookie( $user_id );

/* Add Custom Profile Fields In The Admin Area */
add_action( 'show_user_profile', 'smashing_profile_fields' );
add_action( 'edit_user_profile', 'smashing_profile_fields' );

function smashing_profile_fields( $user ) { 
?>

	<h3>Social Sites</h3>

	<table class="form-table">

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

			<td>
				<input type="text" name="twitter" id="twitter" value="<?php echo esc_attr( get_the_author_meta( 'twitter', $user->ID ) ); ?>" /><br />
				<span class="description">Your Twitter Username</span>
			</td>
		</tr>

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

			<td>
				<input type="text" name="facebook" id="facebook" value="<?php echo esc_attr( get_the_author_meta( 'facebook', $user->ID ) ); ?>" /><br />
				<span class="description">Your Facebook Profile URL</span>
			</td>
		</tr>
		
		<tr>
			<th><label for="twitter">Linkedin</label></th>

			<td>
				<input type="text" name="linkedin" id="linkedin" value="<?php echo esc_attr( get_the_author_meta( 'linkedin', $user->ID ) ); ?>" /><br />
				<span class="description">Your Linkedin Profile URL</span>
			</td>
		</tr>

	</table>

<?php
}
add_action( 'personal_options_update', 'smashing_save_profile_fields' );
add_action( 'edit_user_profile_update', 'smashing_save_profile_fields' );

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

	update_user_meta( $user_id, 'twitter', $_POST['twitter'] );
	update_user_meta( $user_id, 'facebook', $_POST['facebook'] );
	update_user_meta( $user_id, 'linkedin', $_POST['linkedin'] );
}

/* Sanitize URLs With Ease */
$my_url = 'http://mypage.com/?awesome=true';
$url = esc_url( $my_url );

/* Empower Text Widgets */
add_filter( 'widget_text', 'do_shortcode' );

/* Add Custom Post Types To The RSS Feed */
add_filter('request', 'smashing_custom_feed');
function smashing_custom_feed( $vars ) {
	if ( isset( $vars['feed'] ) ) {
		$vars['post_type'] = get_post_types();
	}
	return $vars;
}

add_filter('request', 'smashing_custom_feed');

$post_type_list = array( 'post', 'products' );
function smashing_custom_feed( $vars ) {
	if ( isset( $vars['feed'] ) AND !isset( $vars['post_type'] ) ) {
		$vars['post_type'] = $post_type_list;
	}
	return $vars;
}

/* Don’t Break WordPress Loops */
$tmp_query = $wp_query;
query_posts('cat=5&order=ASC');
while( have_posts() ) : the_post() 
?>
	<a href="<?php the_permalink() ?>'><?php the_title() ?></a><br />
<?php
$wp_query = $tmp_query;

/* Custom Database Queries */
$recent_users = $wpdb->get_results( "SELECT display_name, user_registered FROM $wpdb->users ORDER BY user_registered DESC LIMIT 0,10" );

/* Customize WordPress Post Revisions */
// To remove revisions
define( 'WP_POST_REVISIONS', FALSE );

// To limit them
define( 'WP_POST_REVISIONS', 5 );

/* Storing Your Whole Page In A Variable */
add_action('wp_head', 'smashing_buffer_start');
add_action('wp_footer', 'smashing_buffer_end');

function smashing_buffer_start() {
	ob_start( 'smashing_callback' );
}

function buffer_end() {
	ob_end_flush();
}

function smashing_callback( $content ) {
	// Feel free to do things to the content here
	$content = str_replace( 'great', 'awesome', $content );
	echo $content;
}

/* List all hooked WordPress functions */
function list_hooked_functions($tag=false){
 global $wp_filter;
 if ($tag) {
  $hook[$tag]=$wp_filter[$tag];
  if (!is_array($hook[$tag])) {
  trigger_error("Nothing found for '$tag' hook", E_USER_WARNING);
  return;
  }
 }
 else {
  $hook=$wp_filter;
  ksort($hook);
 }
 echo '<pre>';
 foreach($hook as $tag => $priority){
  echo "<br />&gt;&gt;&gt;&gt;&gt;\t<strong>$tag</strong><br />";
  ksort($priority);
  foreach($priority as $priority => $function){
  echo $priority;
  foreach($function as $name => $properties) echo "\t$name<br />";
  }
 }
 echo '</pre>';
 return;
}

/* SHOW THE ADMIN BAR FOR ADMINISTRATORS */
if (!current_user_can( 'manage_options' )) {
        add_filter('show_admin_bar', '__return_false');
}