title: Php, how to add span tag to every sentence from string which is end with "."?
body: <p>I would like to add span tag for every sentence which ended with "." 
  like:
  my string:</p>
  
  <p>"I could not have said, ’Betrayest thou the Son of man with a kiss?’ unless I believed in betrayal. The whole message of the crucifixion was simply that I did not."</p>
  
  <p>O/P:</p>
  
  <pre><code>"&lt;span id="s1"&gt;I could not have said, ’Betrayest thou the Son of man with a kiss?’ unless I believed in betrayal.&lt;/span&gt; &lt;span id="s2"&gt;The whole message of the crucifixion was simply that I did not.&lt;/span&gt;"
  </code></pre>
  
  <p>how it possible with php?</p>