title: Prevent dollar sign to be added from certain strings
body: <p>I have this this array;</p>
  
  <pre><code>Array ( 
         [0] =&gt; ( 
         [1] =&gt; he 
         [2] =&gt; + 
         [3] =&gt; is 
         [4] =&gt; + 
         [5] =&gt; genius 
         [6] =&gt; ) 
         [7] =&gt; * 
         [8] =&gt; and 
         [9] =&gt; / 
         [10] =&gt; clever )
  </code></pre>
  
  <p>It was possibe to put dollar sign before each alphanumeric string in array, the link is here :
  <a href="https://stackoverflow.com/questions/25868547/adding-dollar-sign-before-each-string-in-array">Adding dollar sign before each string in array?</a></p>
  
  <p>Now, Is it possible to prevent dollar sign to be added to a certain strings, for example if there is a word she, who or they in array than dollar sign should not be added to these strings?</p>