PHP infinite directory traversal example_PHP tutorial

Recently, I have been able to operate the PHP directory and created an infinite directory traversal:

The functions used are:

isset() determines whether a variable is defined

chdir() Change the current directory to the specified directory.

opendir() opens a directory.

readdir() reads a directory.

getcwd(). Get the current directory.

For if GET is also used to pass the value. Probably these things:

Here is the code:

Copy code The code is as follows:

if(isset($_GET['id'] ))
{

$s=$_GET['id'];
chdir($s);
}
echo 'Currently in'.getcwd(),'
';
$a=opendir('.');
while($c=readdir($a))
{
if(is_dir($c))
{
$w =getcwd().'\'.$c;
echo $c."Open
" ;
}
else
{
echo $c.'
';
}

}

?>

If you have any suggestions, please give them! ! Thanks! !

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