title: How to check if a word exists in a sentence
body: <p>For example, if my sentence is <code>$sent = 'how are you';</code> and if I search for <code>$key = 'ho'</code> using <code>strstr($sent, $key)</code> it will return <code>true</code> because my sentence has <code>ho</code> in it. </p>
  
  <p>What I'm looking for is a way to return true if I only search for how, are or you. How can I do this?</p>