Function code for traversing folders and subdirectories using PHP

Function code for traversing folders and subdirectories using PHP_PHP tutorial

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Release： 2016-07-21 15:23:45

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The function we are going to use is Scandir, which lists the files and directories in a specified path, just like Dir.

Function code for traversing folders and subdirectories using PHP_PHP tutorial
> and the more powerful Glob() function, which returns file names or directories that match the specified pattern in the form of an array.
> Friendly reminder, don’t stay in front of the computer for too long like Xiaoxie, otherwise you will suffer from high blood sugar like Xiaoxie.

1. Traverse single-layer folders:

> The problem with scanning single-layer folders is that although the results of the two functions are different, the performance is not much different.
> The Scandir function will provide two extra lines, namely "." and "..", while Glob does not.

Copy code The code is as follows:

 
function get_dir_scandir(){ 
$tree = array(); 
 foreach(scandir('./') as $single){ 
echo $single."
rn"; 
} 
} 
get_dir_scandir(); 

function get_dir_glob(){ 
$tree = array(); 
foreach(glob('./*') as $single){ 
echo $single."
rn "; 
} 
} 
get_dir_glob(); 

2. Recursively traverse the file tree:

> On the issue of recursively scanning the folder tree , or the Glob function performs better, to be precise.
> The Scandir function will inexplicably scan the file at ../ twice, that is to say, if Xiaoxie has two files.
> ../b.php and ../a.php, the results will appear twice on the scan report, which is very strange.

Copy code The code is as follows:

 
//Update at 2010.07.25 - The following code is invalid
$path = ' ..'; 
function get_filetree_scandir($path){ 
$tree = array(); 
foreach(scandir($path) as $single){ 
if(is_dir('../ '.$single)){ 
$tree = array_merge($tree,get_filetree($single)); 
} 
else{ 
$tree[] = '../'.$single ; 
} 
} 
return $tree; 
} 
print_r(get_filetree_scandir($path)); 

//Update at 2010.07.25 - The following is the new code 
$path = './'; 
function get_filetree_scandir($path){ 
$result = array(); 
$temp = array(); 
if (!is_dir($ path)||!is_readable($path)) return null; //Check directory validity
$allfiles = scandir($path); //Get all files and folders in the directory
foreach ($allfiles as $filename) { //Traverse the files and folders in the directory 
if (in_array($filename,array('.','..'))) continue; //Ignore. and.. 
 $fullname = $path.'/'.$filename; //Get the full file path
if (is_dir($fullname)) { //If it is a directory, continue the recursion
$result[$filename] = get_filetree_scandir( $fullname); //Recursion starts
} 
else { 
$temp[] = $filename; //If it is a file, store it in the array
} 
} 
foreach ($temp as $tmp) { //Save the contents of the temporary array into the array that saves the results
$result[] = $tmp; //This allows the folder to be sorted in the front and the file in the back
} 
return $result; 
} 
print_r(get_filetree_scandir($path)); 

> The Glob function scan is very accurate and will automatically sort the order alphabetically. It seems is the best solution.

Copy code The code is as follows:

 
$path = '..'; 
function get_filetree($path){ 
$tree = array(); 
foreach(glob($path.'/*') as $single){ 
if(is_dir($single)){ 
$tree = array_merge( $tree,get_filetree($single)); 
} 
else{ 
$tree[] = $single; 
} 
} 
return $tree; 
} 
print_r(get_filetree($path)); 