title: If string contains forward slash
body: <p>How do i make a if statement which checks if the string contains a forward slash?</p>
  
  <pre><code>$string = "Test/Test";   
  if($string .......)
  {
      mysql_query(""); 
  } 
  else 
  {
      echo "the value contains a invalid character"; 
  } 
  </code></pre>