WordPress Function Snippets

wp-snippets.php

<!--------------------------------------------------------
    SNIPPETS INDEX
-- 01 - Enqueue Google Fonts
-- 02 - Make jQuery load from Google Library
-- 03 - Customize excerpt length and read more characters
-- 04 - Enable Pagination Links
-- 05 - Replace WP login logo with custom
-- 06 - Displays a custom Dashboard Widget
-- 07 - Allow different file formats in Media Library
-- 08 - Turn Off Your Self-referring Pingbacks
-- 09 - Inject Post Images Into the RSS Feed
-- 10 - Responsive Videos – YouTube and Vimeo
-- 11 - Custom Sidebars
-- 12 - Modifies tag cloud widget arguments to have all tags in the widget same font size
-- 13 - Expanding Your User Profile With Further Social Media Accounts
-- 14 - Make Post Images Mandatory
-- 15 - Change the Look of the First Paragraph
-- 16 - Load the Entire JavaScript in the Footer
-- 17 - Create a Breadcrumb Navigation Without a Plugin
-- 18 - Related posts
-- 19 - Hide Plugin
-- 20 - Hide Username
-- 21 - Limit Login Attempts

<!--------------------------------------------------------
-- 01 - Enqueue Google Fonts
--------------------------------------------------------->
<?php
function google_fonts() {
                wp_register_style('OpenSans', 'https://fonts.googleapis.com/css?family=Open+Sans:400,400i,600i,700,700i,800');
                wp_enqueue_style( 'OpenSans');
        }
add_action( 'wp_print_styles', 'google_fonts' );
?>
<!--------------------------------------------------------
-- 02 - Make jQuery load from Google Library
--------------------------------------------------------->
<?php
function replace_jquery() {
	if (!is_admin()) {
		wp_deregister_script('jquery');
		wp_register_script('jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js', false, '1.11.0');
		wp_enqueue_script('jquery');
	}
}
add_action('init', 'replace_jquery');
?>
<!--------------------------------------------------------
-- 03 - Customize excerpt length and read more characters
--------------------------------------------------------->
<?php
function wpt_excerpt_length( $length ) {
    return 50;   
}
    add_filter( 'excerpt_length', 'wpt_excerpt_length', 999 );
//Custom Read More Excerpt
function new_excerpt_more( $more ) {
	return '...';
}
    add_filter('excerpt_more', 'new_excerpt_more');
?>
<!----- USE WITH ----->
// Deleting the original tag:
<?php the_excerpt(); ?>
// Exchange with this tag, and enter any length (in brackets):
<?php the_excerpt_max_charlength( 250 ); ?>
<!--------------------------------------------------------
-- 04 - Enable Pagination Links
--------------------------------------------------------->
<?php
if ( ! function_exists( 'my_pagination' ) ) :
	function my_pagination() {
		global $wp_query;
		$big = 999999999; // need an unlikely integer
		
		echo paginate_links( array(
			'base' => str_replace( $big, '%#%', esc_url( get_pagenum_link( $big ) ) ),
			'format' => '?paged=%#%',
			'current' => max( 1, get_query_var('paged') ),
			'total' => $wp_query->max_num_pages,
            'prev_text'    => 'Newer Posts',
            'next_text'    => 'Older Posts'
		) );
	}
endif;
?>
<!----- USE WITH ----->
<?php my_pagination(); ?>
<!--------------------------------------------------------
-- 05 - Replace WP login logo with custom
--------------------------------------------------------->
<?php
function my_login_logo() { ?>
    <style type="text/css">
        #login h1 a, .login h1 a {
            background-image: url(<?php echo get_stylesheet_directory_uri(); ?>/images/LOGO.png);
            background-size: 260px 110px;
            width: 260px;
            height: 110px;
        }
    </style>
<?php }
add_action( 'login_enqueue_scripts', 'my_login_logo' );
?>
<!--------------------------------------------------------
-- 06 - Displays a custom Dashboard Widget
--------------------------------------------------------->
<?php
function ah_custom_dashboard_widgets() {
global $wp_meta_boxes;
wp_add_dashboard_widget('custom_help_widget', 'Theme Support', 'ah_custom_dashboard_help');
}
function ah_custom_dashboard_help() {
echo '<p>Custom dashboard widget via functions.php</p>';
}
add_action('wp_dashboard_setup', 'ah_custom_dashboard_widgets');
?>
<!--------------------------------------------------------
-- 07 - Allow different file formats in Media Library
--------------------------------------------------------->
<?php
/**
 * Add further Mime types for the download of the products 
 */
function add_custom_mime_types($mimes){
 $new_file_types = array (
 'zip' => 'application/zip',
 'mobi' => 'application/x-mobipocket-ebook',
 'pdf' => 'application/pdf',
 'epub' => 'application/epub+zip'
 );
 return array_merge($mimes,$new_file_types);
}
add_filter('upload_mimes','add_custom_mime_types');
?>
<!--------------------------------------------------------
-- 08 - Turn Off Your Self-referring Pingbacks
--------------------------------------------------------->
<?php
function evolution_no_self_ping( &$links ) {
    $home = get_option( 'home' );
    foreach ( $links as $l => $link )
        if ( 0 === strpos( $link, $home ) )
            unset($links[$l]);
}
add_action( 'pre_ping', 'evolution_no_self_ping' );
?>
<!--------------------------------------------------------
-- 09 - Inject Post Images Into the RSS Feed
--------------------------------------------------------->
<?php
/**
 * Add Post Images to the RSS Feed 
 */
function evolution_featuredtoRSS($content) {
global $post;
if ( has_post_thumbnail( $post->ID ) ){
$content = '<div>' . get_the_post_thumbnail( $post->ID, 'large', array( 'style' => 'margin-bottom: 15px;' ) ) . '</div>' . $content;
}
return $content;
}
 
add_filter('the_excerpt_rss', 'evolution_featuredtoRSS');
add_filter('the_content_feed', 'evolution_featuredtoRSS');
?>
<!--------------------------------------------------------
-- 10 - Responsive Videos – YouTube and Vimeo
--------------------------------------------------------->
<?php
function evolution_wrap_oembed( $html ){
    $html = preg_replace( '/(width|height)="\d*"\s/', "", $html ); // Strip width and height #1
    return'<div class="embed-responsive embed-responsive-16by9">'.$html.'</div>'; // Wrap in div element and return #3 and #4
}
add_filter( 'embed_oembed_html','evolution_wrap_oembed',10,1);
?>
<!----- ADD TO CSS ----->
.embed-responsive.embed-responsive-16by9 {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 */
    padding-top: 25px;
    height: 0;
}
.embed-responsive.embed-responsive-16by9 iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
/* This indication makes HTML5 videos responsive */
video {
    width: 100% !important;
    height: auto !important;
}
<!------------------------------------------------------------------
-- 11 - Custom Sidebars
------------------------------------------------------------------->
<?php if ( ! is_active_sidebar( 'sidebar-1' ) ) {
	return;
}
?>
<?php 
function humescores_widgets_init() {
    //copy from HERE
	register_sidebar( array(
		'name'          => esc_html__( 'Sidebar', 'humescores' ),
		'id'            => 'sidebar-1',
		'description'   => esc_html__( 'Add widgets here.', 'humescores' ),
		'before_widget' => '<section id="%1$s" class="widget %2$s">',
		'after_widget'  => '</section>',
		'before_title'  => '<h2 class="widget-title">',
		'after_title'   => '</h2>',
	) );
    //to HERE
}
add_action( 'widgets_init', 'humescores_widgets_init' );
?>
<!-----USE WITH----->
<?php dynamic_sidebar( 'sidebar-1' ); ?>
<!----------------------------------------------------------------------------------------
-- 12 - Modifies tag cloud widget arguments to have all tags in the widget same font size
----------------------------------------------------------------------------------------->
<?php
function blog_widget_tag_cloud_args( $args ) {
	$args['largest'] = 1;
	$args['smallest'] = 1;
	$args['unit'] = 'em';
	return $args;
}
add_filter( 'widget_tag_cloud_args', 'blog_widget_tag_cloud_args' );
?>
<!----------------------------------------------------------------------
-- 13 - Expanding Your User Profile With Further Social Media Accounts
----------------------------------------------------------------------->
<?php
/**
 * Managing contact fields for author bio
 */
$evolution_pro_Contactfields = new evolution_pro_Contactfields(
// Missing accounts can easily be added 
       array (
	'Feed',
	'Twitter',
        'Facebook',
        'GooglePlus',
        'Flickr',
        'Xing',
        'Github',
        'Instagram',
        'LinkedIn',
        'Pinterest',
        'Vimeo',
        'Youtube'
	)
);
class evolution_pro_Contactfields {
	public
		$new_fields
	,	$active_fields
	,	$replace
	;
	/**
	 * @param array $fields New fields: array ('Twitter', 'Facebook')
	 * @param bool $replace Replace default fields?
	 */
	public function __construct($fields, $replace = TRUE)
	{
		foreach ( $fields as $field )
		{
			$this->new_fields[ mb_strtolower($field, 'utf-8') ] = $field;
		}
		$this->replace = (bool) $replace;
		add_filter('user_contactmethods', array( $this, 'add_fields' ) );
	}
	/**
	 * Changing contact fields
	 * @param  $original_fields Original WP fields
	 * @return array
	 */
	public function add_fields($original_fields)
	{
		if ( $this->replace )
		{
			$this->active_fields = $this->new_fields;
			return $this->new_fields;
		}
		$this->active_fields = array_merge($original_fields, $this->new_fields);
		return $this->active_fields;
	}
	/**
	 * Helper function
	 * @return array The currently active fields.
	 */
	public function get_active_fields()
	{
		return $this->active_fields;
	}
}
 ?>
<!----- USE WITH ----->
<?php 
$twitter = get_the_author_meta( 'twitter', $post->post_author );
$facebook = get_the_author_meta( 'facebook', $post->post_author );
echo '<a href="https://twitter.com/' . $twitter .'" rel="nofollow" target="_blank">Twitter</a> | <a href="'. $facebook .'" rel="nofollow" target="_blank">Facebook</a>';
?> 
<!--------------------------------------------------------
-- 14 - Make Post Images Mandatory
--------------------------------------------------------->
<?php
add_action('save_post', 'evolution_check_thumbnail');
add_action('admin_notices', 'evolution_thumbnail_error');
function evolution_check_thumbnail($post_id) {
    // change to any custom post type
    if(get_post_type($post_id) != 'post')
        return;
    if ( !has_post_thumbnail( $post_id ) ) {
        // set a transient to show the users an admin message
        set_transient( "has_post_thumbnail", "no" );
        // unhook this function so it doesn't loop infinitely
        remove_action('save_post', 'evolution_check_thumbnail');
        // update the post set it to draft
        wp_update_post(array('ID' => $post_id, 'post_status' => 'draft'));
        add_action('save_post', 'evolution_check_thumbnail');
    } else {
        delete_transient( "has_post_thumbnail" );
    }
}
function evolution_thumbnail_error()
{
    // check if the transient is set, and display the error message
    if ( get_transient( "has_post_thumbnail" ) == "no" ) {
        echo "<div id='message' class='error'><p><strong>You have to assign a post image. Without a post image, the article can't be published.</strong></p></div>";
        delete_transient( "has_post_thumbnail" );
    }
}
 ?>
<!--------------------------------------------------------
-- 15 - Change the Look of the First Paragraph
--------------------------------------------------------->
<?php
/**
 * Auto-Highlighting - Automatic highlighting of a post's first paragraph 
 * @author Andreas Hecht
 */
function tb_first_paragraph_highlight( $content ) {
    return preg_replace( '/<p([^>]+)?>/', '<p$1 class="opener">', $content, 1 );
}
add_filter( 'the_content', 'tb_first_paragraph_highlight' );
?>
<!--------------------------------------------------------
-- 16 - Load the Entire JavaScript in the Footer
--------------------------------------------------------->
<?php
/**
 * @uses wp_head() and wp_enqueue_scripts()
 * 
 */
if ( !function_exists( 'evolution_footer_scripts' ) ) {
    
    function evolution_footer_scripts() { 
	   remove_action('wp_head', 'wp_print_scripts'); 
	   remove_action('wp_head', 'wp_print_head_scripts', 9); 
	   remove_action('wp_head', 'wp_enqueue_scripts', 1); 
    } 
}
add_action( 'wp_enqueue_scripts', 'evolution_footer_scripts' );
 ?>
<!--------------------------------------------------------
-- 17 - Create a Breadcrumb Navigation Without a Plugin
--------------------------------------------------------->
<?php
// Copy from here
function ah_the_breadcrumb() {
                echo '<ul id="crumbs">';
        if (!is_home()) {
                echo '<li><a href="';
                echo get_option('home');
                echo '">';
                echo 'Home';
                echo "</a></li>";
                if (is_category() || is_single()) {
                        echo '<li>';
                        the_category(' </li><li> ');
                        if (is_single()) {
                                echo "</li><li>";
                                the_title();
                                echo '</li>';
                        }
                } elseif (is_page()) {
                        echo '<li>';
                        echo the_title();
                        echo '</li>';
                }
        }
        elseif (is_tag()) {single_tag_title();}
        elseif (is_day()) {echo"<li>Archive for "; the_time('F jS, Y'); echo'</li>';}
        elseif (is_month()) {echo"<li>Archive for "; the_time('F, Y'); echo'</li>';}
        elseif (is_year()) {echo"<li>Archive for "; the_time('Y'); echo'</li>';}
        elseif (is_author()) {echo"<li>Author Archive"; echo'</li>';}
        elseif (isset($_GET['paged']) && !empty($_GET['paged'])) {echo "<li>Blog Archives"; echo'</li>';}
        elseif (is_search()) {echo"<li>Search Results"; echo'</li>';}
        echo '</ul>';
}
 ?>
<!----- USE WITH ----->
<?php ah_the_breadcrumb(); ?>
<!-------------------------------------------------------------
-- 18 - Related posts filtered by Category, Use in Single.php
-------------------------------------------------------------->
<?php $orig_post = $post;
                    global $post;
                    $categories = get_the_category($post->ID);
                    if ($categories) {
                    $category_ids = array();
                    foreach($categories as $individual_category) $category_ids[] = $individual_category->term_id;
                    $args=array(
                    'category__in' => $category_ids,
                    'post__not_in' => array($post->ID),
                    'posts_per_page'=> 3, // Number of related posts that will be shown.
                    'caller_get_posts'=>1
                    );
                    $my_query = new wp_query( $args );
                    if( $my_query->have_posts() ) {
                    while( $my_query->have_posts() ) {
                    $my_query->the_post();?>


                    <div class="col-custom-related">
                        <a href="<? the_permalink()?>" rel="bookmark" title="<?php the_title(); ?>">
                            <?php the_post_thumbnail('large'); ?>
                        </a>
                        <p>
                            <a href="<? the_permalink()?>" rel="bookmark" title="<?php the_title(); ?>">
                                <?php the_title(); ?>
                            </a>
                        </p>
                    </div>

                    <?
                    }
                    }
                    }
                    $post = $orig_post;
                    wp_reset_query(); ?>

<!-------------------------------------------------------------------------------------------------------
-- 19 - Hide Plugin from dashboard. Place in functions.php, replace path from edit plugins pathname.
-------------------------------------------------------------------------------------------------------->

<?php

function hide_plugin_trickspanda() {
  global $wp_list_table;
  $hidearr = array('really-simple-ssl/rlrsssl-really-simple-ssl.php');
  $myplugins = $wp_list_table->items;
  foreach ($myplugins as $key => $val) {
    if (in_array($key,$hidearr)) {
      unset($wp_list_table->items[$key]);
    }
  }
}
 
add_action('pre_current_active_plugins', 'hide_plugin_trickspanda');

?>

<!-------------------------------------------------------------------------------------------------------
-- 20 - Hide Username & Administrator count. Place in functions.php
-------------------------------------------------------------------------------------------------------->
function hide_user_count(){
?>
<style>
table.wp-list-table  tr#user-9, .subsubsub li.administrator span.count{display: none;} 
</style>
<?php
}

<!-------------------------------------------------------------------------------------------------------
-- 21 - Limit Login Attempts
-------------------------------------------------------------------------------------------------------->
	
function check_attempted_login( $user, $username, $password ) {
    if ( get_transient( 'attempted_login' ) ) {
        $datas = get_transient( 'attempted_login' );

        if ( $datas['tried'] >= 3 ) {
            $until = get_option( '_transient_timeout_' . 'attempted_login' );
            $time = time_to_go( $until );

            return new WP_Error( 'too_many_tried',  sprintf( __( '<strong>ERROR</strong>: You have reached authentication limit, you will be able to try again in %1$s.' ) , $time ) );
        }
    }

    return $user;
}
add_filter( 'authenticate', 'check_attempted_login', 30, 3 ); 
function login_failed( $username ) {
    if ( get_transient( 'attempted_login' ) ) {
        $datas = get_transient( 'attempted_login' );
        $datas['tried']++;

        if ( $datas['tried'] <= 3 )
            set_transient( 'attempted_login', $datas , 300 );
    } else {
        $datas = array(
            'tried'     => 1
        );
        set_transient( 'attempted_login', $datas , 300 );
    }
}
add_action( 'wp_login_failed', 'login_failed', 10, 1 ); 

function time_to_go($timestamp)
{

    // converting the mysql timestamp to php time
    $periods = array(
        "second",
        "minute",
        "hour",
        "day",
        "week",
        "month",
        "year"
    );
    $lengths = array(
        "60",
        "60",
        "24",
        "7",
        "4.35",
        "12"
    );
    $current_timestamp = time();
    $difference = abs($current_timestamp - $timestamp);
    for ($i = 0; $difference >= $lengths[$i] && $i < count($lengths) - 1; $i ++) {
        $difference /= $lengths[$i];
    }
    $difference = round($difference);
    if (isset($difference)) {
        if ($difference != 1)
            $periods[$i] .= "s";
            $output = "$difference $periods[$i]";
            return $output;
    }