Display the source code of a file with PHP highlighting.

ShowSourceCode.php

<?php
/* examples of usage:
// in php block
$relativePathToFile = "folder/exampleFile.php";
ShowSourceCode.php?source_file=$relativePathToFile

// as html link
<a href="ShowSourceCode.php?source_file=exampleFile.php" target="blank">View the Source Code</a>
*/

if (isset($_GET['source_file'])) {  // check if file name is given
  if (file_exists($_GET['source_file'])) {  // check if file exists
    $SourceFile = file_get_contents(stripslashes($_GET['source_file']));
    highlight_string($SourceFile);
  } else {
    echo "<p>Invalid source file name or path.</p>\n";
  }
} else {
  echo "<p>No source file name entered.</p>\n";
}
?>