PHP recursively changes all files under a folder

Two methods, random and conditional modes
/*
* time: December 2, 2016 17:58:36
* author: Zhang Chenyang
*email:lequne@126.com
*/
//Generate different file names based on judgment conditions
function fRename($dirname)
{
If (!is_dir($dirname)) {
echo "{$dirname} is not a valid directory!";
exit();
}
$handle = opendir($dirname);

While (($fn = readdir($handle)) !== false) {
If ($fn != '.' && $fn != '..') {

echo "fn = " . $fn . "nr";
$curDir = $dirname . '/' . $fn;

echo "curDir = " . $curDir . "rn";
if (is_dir($curDir)) {
fRename($curDir);
} else {

$path = pathinfo($curDir);
//var_dump($path);//die;
//$newname = $path['dirname'].'/'.rand(0,100).'.'.$path['extension'];
$img_info = getimagesize($curDir);

$h = $img_info[1];
// var_dump($w);
If ($w == 210 && $h == 210) {
} elseif ($w == 720 && $h == 268) {
} Elseif ($ w == 298 && $ h == 198) {
} elseif ($w == 338 && $h == 365) {
} Elseif ($ w == 425 && $ h == 425) {
‐— }
’ ’ out out. out //$n=$new.'.jpg';
//$newname1='.jpg';
var_dump($curDir);
$newname = str_replace($fn, $newname, $curDir);
var_dump($newname);
echo "newname after replacement:" . $newname . "rn";
. // echo $ curdir .'-- '. $ Newme. "& Lt; br & gt;"; }

}

}
}

//Call this method

//fRename('./001');


//Use PHP directory and file functions to traverse all files and folders in the directory given by the user, and modify the file names randomly
function rand_fRename($dirname)
{
Header('content-type:text/html;charset=utf8');
If (!is_dir($dirname)) {
echo "{$dirname} is not a valid directory!";
exit();
}
$handle = opendir($dirname);

While (($fn = readdir($handle)) !== false) {
If ($fn != '.' && $fn != '..') {

echo "fn = " . $fn . "nr";
$curDir = $dirname . '/' . $fn;

echo "curDir = " . $curDir . "rn";
if (is_dir($curDir)) {

// var_dump($new);die;

$newname = str_replace($fn, $new, $curDir);
var_dump($newname);
. rand_fRename($newname);
}
else{

$path = pathinfo($curDir);
//var_dump($path);//die;
//$newname = $path['dirname'].'/'.rand(0,100).'.'.$path['extension'];
//123[1] $img_info=getimagesize($curDir);
// var_dump($img_info);

$w=$img_info[0];
$h=$img_info[1];

// Prevent duplicate random generating file names
$new=rand(10,100000000000);
$n=$new.'.jpg';
//$newname1='.jpg';
var_dump($curDir);
$newname = str_replace($fn,$n,$curDir);
var_dump($newname);
echo "newname after replacement:".$newname."rn";

}

}

}
}

rand_fRename(); //The folder folder that needs to be changed

//Randomly generate string
function generate_password($length = 8)
{
Header('content-type:text/html;charset=utf8');
// Password character set, you can add any characters you need
$chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$password = "";
for ($i = 0; $i < $length; $i++) {
// There are two ways to obtain characters here
// The first is to use substr to intercept any character in $chars;
// The second is to take any element of the character array $chars
// $password .= substr($chars, mt_rand(0, strlen($chars) – 1), 1);
$password .= $chars[mt_rand(0, strlen($chars) - 1)];
}
Return $password;
}