function display_sourcecode($url)  {  $lines = file($url);  $output = "";  foreach ($lines as $line_num => $line) {       // loop thru each line and prepend line numbers      $output.= "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "<br>\n";  }  }

用法：

<?php  $url = "http://www.open-open.com";  $source = display_sourcecode($url);  echo $source;  ?>