rename uploaded file some error? - php

Question

Below is the code I used in order to upload files into a directory. It works fine. My main question is:
I have tried to do so below:
function get_unique_filename($name) {
$imgExt = strtolower(pathinfo($name,PATHINFO_EXTENSION));
$date = new DateTime();
$date= $date->getTimestamp();
$newname ="bogen_". substr(hash('ripemd160',$date),0,12) .".".$imgExt;
return $newname;
}
function upload(){
$valid_formats = array("jpg", "png");
$max_file_size = 1024*3000;
$path = "../uploads/images/";
$count = 0;
if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST"){
foreach ($_FILES['files']['name'] as $f => $name){
if ($_FILES['files']['error'][$f] == 4) {
continue;
}
if ($_FILES['files']['error'][$f] == 0) {
if ($_FILES['files']['size'][$f] > $max_file_size) {
$message[] = "$name is too large!.";
continue;
}
elseif( ! in_array(pathinfo($name, PATHINFO_EXTENSION), $valid_formats) ){
$message[] = "$name is not a valid format";
continue; // Skip invalid file formats
}
// No error found! Move uploaded files
else{
if(move_uploaded_file($_FILES["files"]["tmp_name"][$f], $path.$this->get_unique_filename($name))){
$count++; // Number of successfully uploaded file
// save name to database
$this->name = $newname;
if($this->create()){
// successfully added to databaes
}
}
}
}
}
}
}
when upload Multi files i'll get same filename and files...how can fix it:

Answer 1

You have to check if file exists with same name and if exists then you have to rename the file.
function get_unique_filename($name) {
$imgExt = strtolower(pathinfo($name,PATHINFO_EXTENSION));
$date = new DateTime();
$date = $date->getTimestamp();
$dir = "../uploads/images/";
$i = 0;
do {
$newname ="bogen_". substr(hash('ripemd160',$date),0,12);
$image_name = $newname . ($i > 0 ? "_($i)" : "") . "." . $imgExt;
$i++;
$path = $dir . $image_name;
} while(file_exists($path));
return $newname;
}

Answer 2

in get_unique_filename($name)
+add : sleep(1);
function get_unique_filename($name) {
sleep(1);
$imgExt = strtolower(pathinfo($name,PATHINFO_EXTENSION));
$date = new DateTime();
$date= $date->getTimestamp();
$newname ="bogen_". substr(hash('ripemd160',$date),0,12) .".".$imgExt;
return $newname;
}