title: How to merge Multiple geojson in to one geojson in one FeatureCollection
body: <p>I have multiple geojson type: FeatureCollection stored in Mysql. I want to merge two or more geojson in to one FeatureCollection geojson and show in my map. I have already leaflet map ready which can easily showing in map.</p>
  
  <p>I read about Mapbox ‘geojson-merge’ but I unable to understand how use api in to my js or PHP file.</p>
  
  <p><a href="https://github.com/mapbox/geojson-merge" rel="noreferrer">https://github.com/mapbox/geojson-merge</a></p>
  
  <p>I search it for example on web but unable to find any guide about how to use with my online code. </p>