title: which variable is correct to parse into the fopen function
body: <p>I have a problem in file opening syntax.I need to be clarified whether $a,$b and $c are same. I have to parse this variable to fopen function so which is correct? </p>
  
  <pre><code>fopen("path","mode");
  </code></pre>
  
  <p>Below are the variables,which should come in the place of path parameter in fopen function?</p>
  
  <pre><code>$filename= test.txt;
  
  $a="$filename";
  
  $b="test.txt";
  
  $c= "\"".$filename."\"";
  </code></pre>