LinkedIn Share Count

linkedin_share_count.php

<?php

function linkedin_share_count( $post_id ) {
  $api = 'http://www.linkedin.com/countserv/count/share?format=json&url=';
  $api .= urlencode( get_permalink( $post_id ) );
  if ( ! ( $count = get_transient( 'linkedin_count' . $post_id ) ) ) {
    $response = wp_remote_get( $api );
    if( is_wp_error( $response ) ) {
      // eat it
      return 0;
    }
    // Should verify the correct json is returned
    $json = json_decode( wp_remote_retrieve_body( $response ) );
    $count = (int) $json->count;
    set_transient( 'linkedin_count' . $post_id, absint( $count ), 30 * MINUTE_IN_SECONDS );
  }
  return $count;
}