font awesome icon not showing code example

Example 1: cannot use font awesome in php mvc

<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet">

Example 2: font awesome icons not working

<i class="icon-camera-retro"></i>

Example 3: font awesome not working

Make sure you don't keep the name of all the font families by using this (*). If yes, you can remove the font-family property.