title: How to check if a string does not contain a specific phrase?
body: <p>How to invert the function of <a href="https://stackoverflow.com/questions/4366730/how-to-check-if-a-string-contains-specific-words">How do I check if a string contains a specific word in PHP?</a></p>
  
  <pre><code>if (strpos($a,'are') !== false) {
      echo 'true';
  }
  </code></pre>
  
  <p>So it echoes <code>true</code> if <code>are</code> is <strong>not</strong> found in <code>$a</code>.</p>