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Strip Titles from WordPress images

add_filter( 'wp_get_attachment_image_attributes', 'my_no_image_title' );
function my_no_image_title ( $attr ) {
    unset( $attr['title'] );
    return $attr;
}

Source:

WordPress Stack Exchange

Upgrade a user from subscriber to editor

$u = new WP_User( $userID );

// Remove role
$u->remove_role( 'subscriber' );

// Add role
$u->add_role( 'editor' );

Source:

Stack Exchange

WordPress: Exclude the_post_thumbnail from gallery shortcode

function exclude_thumbnail_from_gallery($null, $attr)
{
    if (!$thumbnail_ID = get_post_thumbnail_id())
        return $null; // no point carrying on if no thumbnail ID

    // temporarily remove the filter, otherwise endless loop!
    remove_filter('post_gallery', 'exclude_thumbnail_from_gallery');

    // pop in our excluded thumbnail
    if (!isset($attr['exclude']) || empty($attr['exclude']))
        $attr['exclude'] = array($thumbnail_ID);
    elseif (is_array($attr['exclude']))
        $attr['exclude'][] = $thumbnail_ID;

    // now manually invoke the shortcode handler
    $gallery = gallery_shortcode($attr);

    // add the filter back
    add_filter('post_gallery', 'exclude_thumbnail_from_gallery', 10, 2);

    // return output to the calling instance of gallery_shortcode()
    return $gallery;
}
add_filter('post_gallery', 'exclude_thumbnail_from_gallery', 10, 2);

Source:

Stack Overflow

Remove Personal Options from User Profile

<?php
//add this to functions.php of your theme

function remove_opt_start($adddiv) {
$gettitle = array('#<h3>Personal Options</h3>#');
$adddiv = preg_replace($gettitle, '<div class="hidden">', $adddiv,1);
return $adddiv;
}

function start_remove_opt_start() { ob_start("remove_opt_start"); }

function end_remove_opt_start() { ob_end_flush(); }

function remove_opt_end($addend) {
$getname = array('#<h3>Name</h3>#');
$addend = preg_replace($getname, '</div><h3>Name</h3>',$addend,1);
return $addend;
}

function start_remove_opt_end() { ob_start("remove_opt_end"); }

function end_remove_opt_end() { ob_end_flush(); }

add_action('admin_head','start_remove_opt_start');
add_action('admin_head','start_remove_opt_end');
add_action('admin_footer','end_remove_opt_start');
add_action('admin_footer','end_remove_opt_end');

?>

Source:

WordPress.Org

Test if Category exists in WordPress

<?php
/**
 * only in admin area
 *
 * @param string $cat_name
 */
if ( is_admin() && category_exists('uncategorized') ) // cat_slug, cat_name
	return true;
/**
 * outside admin area
 *
 * is_term($term, $taxonomy = '')
 * @param int|string $term The term to check
 * @param string $taxonomy The taxonomy name to use
 */
if ( is_term( 'uncategorized' , 'category' ) ) // cat_slug, cat_name
	return true;
else
	return false;
/**
 * outside admin area
 *
 * get_category( $category, $output = OBJECT, $filter = 'raw' )
 * @param int|object $category Category ID or Category row object
 * @param string $output Optional. Constant OBJECT, ARRAY_A, or ARRAY_N
 * @param string $filter Optional. Default is raw or no WordPress defined filter will applied.
 */
$cat = get_category(1); // cat_ID
if ( !empty( $cat ) )
	return true;
?>

Source:

WP Engineer

WordPress redirect functions

/*redirect any user*/
<?php wp_redirect('http://example.com/'); exit; ?>

/*checks whether or not the current user is logged in, and redirects them to the Login Page if not. By default, the user will be redirected back to the page from whence they came (e.g., the downloads page)*/
<?php auth_redirect(); ?>

/*logout*/
/*Logout & redirect to the home page*/
<a href="<?php echo wp_logout_url(home_url()); ?>">Logout</a>

/*Logout & redirect to current page*/
<a href="<?php echo wp_logout_url(get_permalink()); ?>">Logout</a>

/*Logout & redirect to specific URL*/
<a href="<?php echo wp_logout_url('http://example.com/'); ?>">Logout</a>

Source:

digwp.com

Redirect users to any page on login

/* redirect to current page */
<a href="<?php echo wp_login_url(get_permalink()); ?>" title="Login">Login to view</a>

/* redirect to home page */
<a href="<?php echo wp_login_url(get_bloginfo('wpurl')); ?>" title="Login">Login to view</a>

/* redirect to some other URL */
<a href="<?php echo wp_login_url('http://www.google.com'); ?>" title="Login">Login to view</a>

Source:

wp recipes

Disable PHP timeout

<?php
// Disable PHP Timeout example
// http://php.snippetdb.com 

//set php script timeout, 0 to disable
set_time_limit(0); 

// your time consuming code 

//don't forget to reset to 30 seconds.
set_time_limit(30); 

?>

Source:

Snippetdb.com

Add a login form to WordPress theme

function sidebar_loginform(){
	if (!(current_user_can('level_0'))){
		$content = '
		<form action="' . get_option( 'home' ) . '/wp-login.php" method="post">
		<input type="text" name="log" id="log" value="' . wp_specialchars( stripslashes($user_login), 1 ) . '" size="20" />
		<input type="password" name="pwd" id="pwd" size="20" />
		<input type="submit" name="submit" value="login" class="button" />
			<p>
			   <label for="rememberme"><input name="rememberme" id="rememberme" type="checkbox" checked="checked" value="forever" /> Remember me</label>
			   <input type="hidden" name="redirect_to" value="' . $_SERVER['REQUEST_URI'] . '" />
			</p>
		</form>';
	} else {
		$content = '
		<a href="' . wp_logout_url( urlencode( $_SERVER['REQUEST_URI'] ) ) . '">logout</a><br />
		<a href="' . get_option('home') . '/secret-page/">secret page</a>';
	}
	return $content;
}

Source:

wp recipes
Youtube channel shortcode

Youtube channel shortcode

I try and avoid plugins unless it means re-inventing the wheel, so when I needed to create a slider of content from a users youtube channel, this shortcode function came in very handy
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