Two examples of code for traversing directories in php

/*
 * Traverse the directory
 * fopen()
 * fread()
 * fclose()
 * @opendir(target path);E_WARNINE
 * readdir(directory reference handle) rewinddir ()
 * closedir()
 *
 * In programming, a handle is a special smart pointer. When an application wants to reference memory blocks or objects managed by other systems (such as databases, operating systems)
 *, handles are used. The difference between a handle and an ordinary pointer is that
 * The pointer contains the memory address of the referenced object, while the handle is a reference identifier managed by the system.
 * This identifier can be relocated to a memory address by the system. This mode of indirect object access enhances the system's control over the referenced object.
 * (Script Academy bbs.it-home.org)
 */
$dirHandle=@opendir("phpMyAdmin") or die("Unsuccessful in opening the directory");
echo "All the contents in the phpMyAdmin directory are: < br>";
echo readdir($dirHandle)."";
echo readdir($dirHandle)."";

while(($file=readdir($dirHandle))!= =false)
{
$file="phpMyadmin".DIRECTORY_SEPARATOR.$file;
if(is_dir($file))
{
 echo "Directory: ".$file."";
 }else
 {
 echo "File: ".$file."File size: ".filesize($file)."KB";
}
}
rewinddir($dirHandle); //Return to the beginning of the handle and traverse it again
while(($file=readdir($dirHandle))!==false)
{
$file="phpMyadmin".DIRECTORY_SEPARATOR.$file;
if($file!="."&&$file!=". .") //Do not read directly
{
 if(is_dir($file))
 {
 echo "Directory: ".$file."";
}else
{
 echo "File: ". $file."File size: ".filesize($file)."KB";
}
}
}
closedir($dirHandle);
?>

Example 2,

/*
 * Traverse directory
 *
 * class dir{
 * string path;
 * resource handle;
 * string read(void);
 * void rewind(void);
 * void close(void);
 * }
 *
 * In programming, a handle is a special smart pointer. When an application wants to reference memory blocks or objects managed by other systems (such as databases, operating systems)
 *, handles are used. The difference between a handle and an ordinary pointer is that
 * The pointer contains the memory address of the referenced object, while the handle is a reference identifier managed by the system.
 * This identifier can be relocated to a memory address by the system. This mode of indirect object access enhances the system's control over the referenced object.
 *
 */
$d = dir("phpMyAdmin");
echo "The path is: ".$d->path."";
echo "The reference handle is: ".$d- >handle."";
// $d->read();
// $d->read();
while(($file=$d->read() )!==false)
{
 if($file!="."&&$file!="..")
 {
 echo $file."";
 }
}
$d- >close();
?>