Basit bir resim upload scripti var, resimi seçip yükle butonuna bastıktan sonra yükleme tamamlanıyor ancak o sayfadan çıkmadan f5 butonuna her bastığımızda resim farklı isimle tekrar yükleniyor. Bu sorun başka resim upload sitelerinde var mı diye denedim var ancak şöyle çözüm sağlamışlar resimi yükledikten sonra aynı sayfaya 3 kez f5 attıktan sonra 1-2 dakika sonra tekrar deneyin falan diyor. Bende aynı şekil bir limit koymak istiyorum nasıl yapabilirim yardım edebilecek var mı http://prntscr.com/pn9kbm

<?php
function uploadFile ($file_field = null, $check_image = false, $random_name = false) {

//Config Section
//Set file upload path
$path = 'uploads/'; //with trailing slash
//Set max file size in bytes
$max_size = 1000000;
//Set default file extension whitelist
$whitelist_ext = array('jpeg','jpg','png','gif');
//Set default file type whitelist
$whitelist_type = array('image/jpeg', 'image/jpg', 'image/png','image/gif');

//The Validation
// Create an array to hold any output
$out = array('error'=>null);

if (!$file_field) {
$out['error'][] = "Please specify a valid form field name";
}

if (!$path) {
$out['error'][] = "Please specify a valid upload path";
}

if (count($out['error'])>0) {
return $out;
}

//Make sure that there is a file
if((!empty($_FILES[$file_field])) && ($_FILES[$file_field]['error'] == 0)) {

// Get filename
$file_info = pathinfo($_FILES[$file_field]['name']);
$name = $file_info['filename'];
$ext = $file_info['extension'];

//Check file has the right extension
if (!in_array($ext, $whitelist_ext)) {
$out['error'][] = "Invalid file Extension";
}

//Check that the file is of the right type
if (!in_array($_FILES[$file_field]["type"], $whitelist_type)) {
$out['error'][] = "Invalid file Type";
}

//Check that the file is not too big
if ($_FILES[$file_field]["size"] > $max_size) {
$out['error'][] = "File is too big";
}

//If $check image is set as true
if ($check_image) {
if (!getimagesize($_FILES[$file_field]['tmp_name'])) {
$out['error'][] = "Uploaded file is not a valid image";
}
}

//Create full filename including path
if ($random_name) {
// Generate random filename
$tmp = str_replace(array('.',' '), array('',''), microtime());

if (!$tmp || $tmp == '') {
$out['error'][] = "File must have a name";
}
$newname = $tmp.'.'.$ext;
} else {
$newname = $name.'.'.$ext;
}

//Check if file already exists on server
if (file_exists($path.$newname)) {
$out['error'][] = "A file with this name already exists";
}

if (count($out['error'])>0) {
//The file has not correctly validated
return $out;
}

if (move_uploaded_file($_FILES[$file_field]['tmp_name'], $path.$newname)) {
//Success
$out['filepath'] = $path;
$out['filename'] = $newname;
return $out;
} else {
$out['error'][] = "Server Error!";
}

} else {
$out['error'][] = "No file uploaded";
return $out;
}
}


if (isset($_POST['submit'])) {
$file = uploadFile('file', true, true);
if (is_array($file['error'])) {
$message = '';
foreach ($file['error'] as $msg) {
$message .= '<p>'.$msg.'</p>';
}
} else {
$message = "File uploaded successfully".$newname;
}
echo $message;
}
?>

<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" enctype="multipart/form-data" name="form1" id="form1">
<input name="file" type="file" id="imagee" />
<input name="submit" type="submit" value="Upload" />
</form>