title: strpos issue not giving correct result
body: <p>So I have this code :</p>
  
  <pre><code>$str1 = 'yabadabadoo';
  $str2 = 'yaba';
  if (strpos($str1,$str2)) {
      echo "\"" . $str1 . "\" contains \"" . $str2 . "\"";
  } else {
      echo "\"" . $str1 . "\" does not contain \"" . $str2 . "\"";
  }
  </code></pre>
  
  <p>Which gives me <code>"yabadabadoo" does not contain "yaba"</code>. Why? Shouldn't it give me the other result?</p>