Number of sentence occurrences in another sentence (in PHP)
<p>I am looking for a way to find the number of sentence occurrences in another sentence</p>

<p>For example (I have):</p>

<blockquote>
  <p>Hello brother, I have been waiting to tell you something very
  important. Good bye brother, I will see you next week</p>
</blockquote>

<p>and I am searching for:</p>

<blockquote>
  <p>brother, I</p>
</blockquote>

<p>This should present me the result of:</p>

<blockquote>
  <p>result = 2</p>
</blockquote>
