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This is the code that can serve others if they have the same problem
<?php //take relationship field of this doctor $location= get_field('location'); if( $location): foreach( $location as $l ): //array of post type doctor and take the post with key location and compare with the ID of location of this doctor $l->ID $doctors = get_posts(array( 'post_type' => 'doctor', 'posts_per_page' => '-1', 'post__not_in' => [get_queried_object_id()], 'meta_query' => array( array( 'key' => 'location', // name of custom field 'value' => $l->ID, // the ID of this doctor 'compare' => 'LIKE' ) ) )); ?> <?php if( $doctors ): ?> <?php foreach( $doctors as $doctor ): ?> // <div class="col-md-2"> <a href="<?php echo get_permalink( $doctor->ID ); ?>"> <img src="<?php echo get_the_post_thumbnail_url( $doctor->ID ); ?>"> <h2><?php echo get_the_title( $doctor->ID ); ?></h2> </a> </div> <?php endforeach; ?> //second foreach <?php endif; ?> //second if <?php endforeach; ?> //first foreach <?php endif; ?> //first if
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