<?php

//register the shortcode
add_shortcode( 'social_icons', 'simons_social_shortcode' );


function simons_social_shortcode(){
  //put the field names for the social icons in an array.  (must match the font awesome name, if
  //this isn't possible you could use key => value pairs)
  $social_fields = ['facebook', 'twitter', 'youtube', 'instagram' ];
  //create a string for the icons.
  $html = '';

  //loop through each of the social fields
  foreach ( $social_fields as $social_field ) {
    $social_link = get_field( $social_field, 'option' );
    if( $social_link ) {
      $html .= '<a target="blank" href="' . $social_link . '"><i class="fa fa-' . $social_field . '" aria-hidden="true"></i></a>';
    }
  }
  return $html;

}