Get Related Posts by Tag/Taxonomy Term in WordPress

$taxonomy = 'post_tags';  // or whatever you want

$query = NULL;
$terms = wp_get_post_terms($post->ID, $taxonomy);
if ($terms) {  
    // Get the term ids into an array for the query args
    $term_ids = array();  
    foreach($terms as $individual_term) $term_ids[] = $individual_term->term_id;  

    $args=array(  
        'post_type' => get_post_type(),
        'tax_query' => array(
            array(
                'taxonomy'  => $taxonomy,
                'field'     => 'id',
                'terms'     => $term_ids,
                'operator'  => 'IN'
            ) 
        ),
        'post__not_in' => array($post->ID),  
        'showposts' => $count, // Number of related posts that will be shown.  
        'caller_get_posts' => 1  
    );  

    $query = WP_Query($args)
}

$taxonomy = 'post_tags'; // or whatever you want

$query = NULL;

$terms = wp_get_post_terms($post->ID, $taxonomy);

if ($terms) {

// Get the term ids into an array for the query args

$term_ids = array();

foreach($terms as $individual_term) $term_ids[] = $individual_term->term_id;

$args=array(

'post_type' => get_post_type(),

'tax_query' => array(

array(

'taxonomy' => $taxonomy,

'field' => 'id',

'terms' => $term_ids,

'operator' => 'IN'

)

'post__not_in' => array($post->ID),

'showposts' => $count, // Number of related posts that will be shown.

'caller_get_posts' => 1

);

$query = WP_Query($args)

}

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Get Related Posts by Tag/Taxonomy Term in WordPress