title: how to remove unreadable characters in a context using PHP?
body: <p>Hi am feeding context to zend_lucene_search and it can search for the word up to special characters and after that it is not searchable.</p>
  
  <p>for example:</p>
  
  <pre><code>    very well to the other job boards � one of the main things that has impressed is the variety of the applications, especially with regards to the background of the candidates" manoj � Head 
  </code></pre>
  
  <p>if I search for 'boards' I can get it but if I search for one or any string after the unreadable characters, I cannot search it.</p>
  
  <p>How to remove these and I want to get plain text.</p>
  
  <p>I got these kind of characters on converting .docx/pdf files to text.</p>
  
  <p>OR</p>
  
  <p>let me know how to feed only text to zend_search_lucene..</p>
  
  <p>Please help.</p>