random - Include php file randomly -

i have question php include. here goes existing code have.

<?php srand(); $files = array("folder/content1.php", "folder/content2.php", "folder/content3.php", "folder/content4.php"); $rand = array_rand($files); include ($files[$rand]); ?> 

this code works me content displaying randomly. but, better. because, using code, everytime have added new content content5.php, content6.php , on, have bother update code above make new content.php appear.

is there solution can have, not bother code above everytime add new content.php , new content.php appears automatically when added? possible?

updated: new testing code(tested failed again part of page mising)

    <?php $sdirectory     = 'myfolder'; if( is_dir( $sdirectory ) )  {     $rdir = opendir( $sdirectory );     while( ( $sfile = readdir( $rdir ) ) !== false )      {         if( ( $sfile == '.' ) || ( $sfile === '..' ) )         {             continue;         }         $afiles[] = $sdirectory . '/' . $sfile;     } } $srandom = array_rand( $afiles ); require_once( $afiles[ $srandom ] ); ?> 

$sdirectory     = 'includes'; if( is_dir( $sdirectory ) )  {     $rdir = opendir( $sdirectory );     while( ( $sfile = readdir( $rdir ) ) !== false )      {         if( ( $sfile == '.' ) || ( $sfile === '..' ) )         {             continue;         }         $afiles[] = $sdirectory . '/' . $sfile;     } } $srandom = array_rand( $afiles ); require_once( $afiles[ $srandom ] );