php traverses the files in the directory and sorts them by modification time

In this paper, the example tells php traverses the files under the directory and sorts the operation according to the modification time. Share it for your reference, as follows:

Method of php Traversing Files in Directory

// Method of traversing files in directory 
function printdir($dir)
{
    $files = array();
    //opendir()  Open directory handle 
    if($handle = @opendir($dir)){
    //readdir() From the directory handle ( resource , formerly by opendir() Open) Read entries ,
    //  If not, return false
        while(($file = readdir($handle)) !== false){// Read an entry 
            if( $file != ".." && $file != "."){// Exclude Root Directory 
                if(is_dir($dir . "/" . $file)) {// If file  Is a directory, recursive 
                    $files[$file] = printdir($dir . "/" . $file);
                } else {
                    // Get the file modification date 
                    $filetime = date('Y-m-d H:i:s', filemtime($dir . "/" . $file));
                    // File modification time as key value 
                    $files[$filetime] = $file;
                }
            }
        }
        @closedir($handle);
        return $files;
    }
}

Sort the returned array by time

// Sort arrays according to modification time 
function arraysort($aa) {
    if( is_array($aa)){
        ksort($aa);
        foreach($aa as $key => $value) {
            if (is_array($value)) {
                $arr[$key] = arraysort($value);
            } else {
                $arr[$key] = $value;
            }
        }
        return $arr;
    } else {
        return $aa;
    }
}
$dir = "/php";
// Output  /php  All files under 
print_r(arraysort(printdir($dir)));

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I hope this article is helpful to everyone's PHP programming.