View difference between Paste ID: mr6ym8vs and VjWubfL9

 add_action( 'add_meta_boxes', 'wpse_143600_add_box' );
-add_action( 'save_post', '143600_save_box' );
+add_action( 'save_post', 'wpse_143600_save_box' );
 
 //create the metabox
 function wpse_143600_add_box() {
     add_meta_box(
         'related_testimonial',
         __( 'community', 'wpse_143600_translation' ),
         'wpse_143600_testimonial_box',
         'testimonial',
   'normal'
     );
 }
 
 //build the box
 function wpse_143600_testimonial_box($post) {
 
     wp_nonce_field( basename( __FILE__ ), 'wpse_143600_nonce' );
 
     $wpse_143600_stored_meta = get_post_meta( $post->ID );
 
     $testimonialArgs = array(
   'post_type' => 'community',
   'post_status' => 'publish',
   'numberposts' => -1
     );
 
     $testimonials = get_posts($testimonialArgs);
 
     if($testimonials): ?>
     <p>
       <label for="meta-select" class="wpse_143600-row-title"><?php _e( 'Example Select Input', 'wpse_143600_translation' )?></label>
       <select name="meta-select" id="meta-select">
         <option value="NULL">Please choose a testimonial…</option>
     <?php foreach($testimonials as $testimonial): ?>
         <option value="<?php echo $testimonial->ID; ?>" <?php if ( isset ( $wpse_143600_stored_meta['meta-select'] ) ) selected( $wpse_143600_stored_meta['meta-select'][0], $testimonial->ID ); ?>><?php echo $testimonial->post_title; ?></option>
     <?php endforeach; ?>
       </select>
     </p>
     <?php
     else:
     ?>
   <p>There are no testimonials - please save this post, and write some testimonials. You'll then be able to choose a testimonial for this location.</p>
     <?php
     endif;
 }
 
 //save the box
 function wpse_143600_save_box( $post_id ) {
     $is_autosave = wp_is_post_autosave( $post_id );
     $is_revision = wp_is_post_revision( $post_id );
     $is_valid_nonce = ( isset( $_POST[ 'wpse_143600_nonce' ] ) && wp_verify_nonce( $_POST[ 'wpse_143600_nonce' ], basename( __FILE__ ) ) ) ? 'true' : 'false';
 
     // Exits script depending on save status
     if ( $is_autosave || $is_revision || !$is_valid_nonce ) {
         return;
     }
     // Checks for input and saves if needed
     if( isset( $_POST[ 'meta-select' ] ) ) {
       update_post_meta( $post_id, 'meta-select', $_POST[ 'meta-select' ] );
     }
 }