title: Find and edit text files via PHP
body: <p>Let say a text file contain</p>
  
  <blockquote>
    <p>Hello everyone, My name is Alice, i stay in Canada.</p>
  </blockquote>
  
  <p>How do i use php to find "Alice" and replace it with "John".</p>
  
  <pre><code>    $filename = "C:\intro.txt";
      $fp = fopen($filename, 'w');
      //fwrite($fp, $string);
      fclose($fp);
  </code></pre>