本文实例讲述了php遍历树的常用方法。分享给大家供大家参考。具体如下：

一、递归的深度优先的算法：

<?phpdefine('DS', DIRECTORY_SEPARATOR);function rec_list_files($from = '.'){ if(!is_dir($from)) { return array(); } $files = array(); if($dh = opendir($from)) { while(false !== ($file = readdir($dh))) { if($file == '.' || $file == '..') { continue; } $path = $from . DS . $file; if (is_file($path)) { $files[] = $path; } $files = array_merge($files, rec_list_files($path)); } closedir($dh); } return $files;}function profile($func, $trydir){ $mem1 = memory_get_usage(); echo '<pre>----------------------- Test run for '.$func.'() '; flush(); $time_start = microtime(true); $list = $func($trydir); //print_r($list); $time = microtime(true) - $time_start; echo 'Finished : '.count($list).' files</pre>'; $mem2 = memory_get_peak_usage(); printf('<pre>Max memory for '.$func.'() : %0.2f kbytes Running time for '.$func.'() : %0.f s</pre>', ($mem2-$mem1)/1024.0, $time); return $list;}profile('rec_list_files', "D:\bined_path); } else { $files[] = $base.$child; } } closedir($handle); } // else unable to open directory => NEXT CHILD } return $files; // end of tree, file not found}function profile($func, $trydir){ $mem1 = memory_get_usage(); echo '<pre>----------------------- Test run for '.$func.'() '; flush(); $time_start = microtime(true); $list = $func($trydir); //print_r($list); $time = microtime(true) - $time_start; echo 'Finished : '.count($list).' files</pre>'; $mem2 = memory_get_peak_usage(); printf('<pre>Max memory for '.$func.'() : %0.2f kbytes Running time for '.$func.'() : %0.f s</pre>', ($mem2-$mem1)/1024.0, $time); return $list;}profile('breadth_first_files', "D:\www\server");?>

希望本文所述对大家的php程序设计有所帮助。