CodeHQ

Custom query on taxonomy page | WordPress

This will go in taxnonomy.php or taxonomy-name.php templates.

$term = get_term_by( 'slug', get_query_var('term'), get_query_var('taxonomy') ); 

$customField = get_field('custom_field_name')];
$args = array(
	'posts_per_page' => '-1',
	'post_type' 	 => 'service_centres',
	'tax_query' => array (
		array (
			'taxonomy' => 'regions',
			'field' => 'slug',
			'terms' =>  $term->slug
		)
	),
	'meta_key'	 => 'custom_field_name',
	'meta_value'	 => 'custom_field_value_value'
);

Grab first image from post

Function for grabbing image from post and using it instead of a featured image for example.

Add this to functions.php

// Get URL of first image in a post
function catch_that_image() {
	global $post, $posts;
		$first_img = '';
		ob_start();
		ob_end_clean();
		$matches[1][0] = '';
		if(preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches)){
		  	$first_img = $matches[1][0];
		}

	// no image found display default image instead
	return $first_img;
}

And call in the theme with

<img src="<?php echo catch_that_image() ?>" onerror="this.style.display = 'none';"/>

Query posts by current post category

Great for showing ‘related posts’ by current post category. The current post has an ID, the query grabs that ID, checks with categories are associated with that post, creates an array and passes these through to the query, also excluding this current post from the loop.

Output is posts from the same category/categories as the current post (active page).

<?php 
	$args = array(
		'posts_per_page' => 3,
		'post__not_in'   => array( get_the_ID() ),
		'no_found_rows'  => true, //Np pagination needed so query is quicker
		'post__not_in' 	 => array($post->ID)  //Excludes current post
	);
 
	$cats = wp_get_post_terms( get_the_ID(), 'category' ); 
	$cats_ids = array();  
	foreach( $cats as $wpex_related_cat ) {
		$cats_ids[] = $wpex_related_cat->term_id; 
	}
	if ( ! empty( $cats_ids ) ) {
		$args['category__in'] = $cats_ids;
	}
	$wpex_query = new wp_query( $args );
 
	foreach( $wpex_query->posts as $post ) : setup_postdata( $post ); ?>
 
	//CONTENT HERE i.e. post data and title
 
<?php endforeach; wp_reset_postdata();?>

Limit WordPress Revisions

Add this to you wp-config.php file and change the number for how many revisions you want to limit your pages to:

define('WP_POST_REVISIONS', 10);

Or use the below to globally turn off post revisions:

define('WP_POST_REVISIONS', false);

jQuery in the footer

Add this to your functions.php

function my_init()   
{  
    if (!is_admin())   
    {  
        wp_deregister_script('jquery');  
  
        // Load a copy of jQuery from the Google API CDN  
        // The last parameter set to TRUE states that it should be loaded  
        // in the footer.  
        wp_register_script('jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js', FALSE, '1.11.0', TRUE);  
  
        wp_enqueue_script('jquery');  
    }  
}  
add_action('init', 'my_init');

Remove script and style version numbers | WordPress

Add this to functions.php

// Pick out the version number from scripts and styles
function remove_version_from_style_js( $src ) {
    if ( strpos( $src, 'ver=' . get_bloginfo( 'version' ) ) )
        $src = remove_query_arg( 'ver', $src );
    return $src;
}
add_filter( 'style_loader_src', 'remove_version_from_style_js');
add_filter( 'script_loader_src', 'remove_version_from_style_js');

Echo thumbnail URL and size | WordPress

Use the PHP in the query below – and then the HTML example below to echo the URL out. 

the_post_thumbnail_url();                  // without parameter -> 'post-thumbnail'
 
the_post_thumbnail_url( 'thumbnail' );       // Thumbnail (default 150px x 150px max)
the_post_thumbnail_url( 'medium' );          // Medium resolution (default 300px x 300px max)
the_post_thumbnail_url( 'large' );           // Large resolution (default 640px x 640px max)
the_post_thumbnail_url( 'full' );            // Full resolution (original size uploaded)
 
the_post_thumbnail_url( array(100, 100) );  // Other resolutions