post - Wordpress infinite previous next looping in same category -

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i have code can me make work in same category in custom post = 'project'

    <?php  /**  *  infinite next , previous post looping in wordpress  */ if( get_adjacent_post(false, '', true) ) {      previous_post_link('%link', '&larr; previous post'); } else {      $first = new wp_query('posts_per_page=1&order=desc'); $first->the_post();         echo '<a href="' . get_permalink() . '">&larr; previous post</a>';     wp_reset_query(); };   if( get_adjacent_post(false, '', false) ) {      next_post_link('%link', 'next post &rarr;'); } else {      $last = new wp_query('posts_per_page=1&order=asc'); $last->the_post();         echo '<a href="' . get_permalink() . '">next post &rarr;</a>';     wp_reset_query(); };   ?> 

// set current category $categories = get_the_category(); $category = $categories[0]; $cat_id = $category->cat_id;      // next post link $next_post = get_adjacent_post( true, '', false ); if( $next_post ) {     echo '<a href="' . get_permalink( $next_post->id ) . '">next post</a>'; } else {     $first = new wp_query( array(         'post_type' => 'project',         'post_status' => 'publish',         'posts_per_page' => 1,         'order' => 'asc',         'cat' => $cat_id     ));      $first->the_post();     echo '<a href="' . get_permalink() . '">next post</a>';     wp_reset_query(); };  // show prev post link $prev_post = get_adjacent_post( true, '', true ); if( $prev_post ) {     echo '<a href="' . get_permalink( $prev_post->id ) . '">prev post</a>'; } else {     $last = new wp_query( array(         'post_type' => 'project',         'post_status' => 'publish',         'posts_per_page' => 1,         'order' => 'desc',         'cat' => $cat_id     ));      $last->the_post();     echo '<a href="' . get_permalink() . '">prev post</a>';     wp_reset_query(); };

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