PHP infinite folder traversal example sharing_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() changes the current directory to the specified directory.

opendi() opens a directory.

readdir() reads the directory.

getcwd() gets 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'] ))//Determine whether to pass a value
{
$s=str_replace(' ','+',$_GET['id']);
$s=base64_decode($s);// The value passed is generally the absolute path of the directory to be opened
chdir($s);//Switch to the directory to be opened
}
$a=opendir('.');/ /Open the current directory
while(false!==($c=readdir($a)))//Loop through the file names of the directory contents
{ 
 if(is_dir($c))// Determine whether it is a directory or a file {
If($c=='.. ')
{
> echo "Previous level"."Open
";//The absolute value that will be opened when clicked to open Pass the path out and use chdir to switch to the directory you want to open
                                                                                                                                                                                                            . Absolute path to the directory
echo "$c"."Open
";//When clicked to open Pass the absolute path to be opened. Use chdir to switch to the directory to be opened.
🎜>                     echo "$c is not a directory
";
}
}

?>






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Recently, I have been able to operate the PHP directory and made an infinite directory traversal: The functions used are: isset() determines a certain Whether each variable is defined chdir() changes the current directory to the specified directory. opened...