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How to traverse directories in php, example of php non-recursive algorithm for traversing directories

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Release: 2016-07-25 08:51:29
Original
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  1. function myscandir($pathname){
  2. foreach( glob($pathname) as $filename ){
  3. if(is_dir($filename)){
  4. myscandir($filename.'/*' );
  5. }else{
  6. echo $filename.'
    ';
  7. }
  8. }
  9. }
  10. myscandir('D:/wamp/www/exe1/*');
  11. ?>
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2. Method 2

  1. function myscandir($path){
  2. $mydir=dir($path);
  3. while($file=$mydir->read()){
  4. $p=$path .'/'.$file;
  5. if(($file!=".") AND ($file!="..")){
  6. echo $p.'
    ';
  7. }
  8. if( (is_dir($p)) AND ($file!=".") AND ($file!="..")){
  9. myscandir($p);
  10. }
  11. }
  12. }
  13. myscandir(dirname(dirname( __FILE__)));
  14. ?>
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2. Usage of php directory traversal function opendir

The function of opendir() function: Open the directory handle. If the function runs successfully, it will return a set of directory streams (a set of directory strings). If it fails, it will return an error [error]. You can add "@" at the front of the function to hide the error.

syntax syntax: opendir(directory,context) parameter

Parameter:description

Description: directory required. specifies the directory to stream Required parameters specify the directory object. Optional parameters specify the context of the directory object that needs to be processed. This context includes a set of options that can change the display mode of the text stream.

Code:

  1. $dir = "./";
  2. // open a known directory, and proceed to read its contents
  3. if (is_dir($dir))
  4. {
  5. if ($dh = opendir($dir)) {
  6. while (($file = readdir($dh)) !== false) {
  7. echo "filename: $file : filetype: " . filetype($dir . $file) . "n "."
    ";
  8. }
  9. closedir($dh);
  10. }
  11. }
  12. ?>
PHP does not need to recurse to implement the code to list all files in a directory
Code:

/**

* PHP non-recursive implementation to query all files in the directory

* @param unknown $dir

* @return multitype:|multitype:string
*/
function scanfiles($dir) {
    if (! is_dir ( $dir ))
  1. return array ();

  2. < ;p> // Compatible with all operating systems
  3. $dir = rtrim ( str_replace ( '\', '/', $dir ), '/' ) . '/';

  4. // Stack, the default value is the passed in directory

  5. $dirs = array ( $dir );

  6. // Container to place all files

  7. $rt = array ();

  8. do {

  9. // Pop the stack
  10. $dir = array_pop ( $dirs );

  11. // Scan the directory

  12. $tmp = scandir ( $dir );
  13. foreach ( $tmp as $f ) {

  14. // Filter. ..
  15. if ($f == '.' || $f == '..')
  16. continue;
  17. // Combine the current absolute path
  18. $path = $dir . $f;
  19. // If it is a directory, push it onto the stack.
  20. if (is_dir ( $path )) {
  21. array_push ( $dirs, $path . '/' );
  22. } else if (is_file ( $path )) { // If it is a file, put it in the container
  23. $rt [ ] = $path;
  24. }
  25. }

  26. } while ( $dirs ); // Until there is no directory in the stack

  27. return $rt;

  28. }< ;/p>
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source:php.cn
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