title: PHP str_replace doesn't work as expected
body: <p>I'm trying to use str_replace to correct a filepath as shown below:</p>
  
  <pre><code>$a="F:\xampp\htdocs\yii\get_smart\Music\mix\English\1636464449";  
  $a=str_replace('\\','/', $a);  
  echo $a;
  </code></pre>
  
  <p>returns: </p>
  
  <pre><code>F:
  mpp/htdocs/yii/get_smart/Music/mix/Englishs6464449
  </code></pre>
  
  <p>Can someone please tell me what I'm doing wrong?</p>
  
  <p>My PHP version is 5.3.8</p>