重命名並上傳文件

Question

我正在使用此代碼（從w3schools得到），我想在上傳之前爲每個圖像名稱添加隨機數字，例如： <?php $randomnum = rand(470000,900000); ?> 我該怎麼做？

if($_FILES["image"]){ 
$target_dir = "images/"; 
$target_file = $target_dir . basename($_FILES["image"]["name"]); 
$uploadOk = 1; 
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION); 
if (file_exists($target_file)) { 
$error = "Sorry, file already exists. Rename the file and try again."; 
$uploadOk = 0; 
} 
if ($_FILES["image"]["size"] > 500000) { 
$error = "Sorry, your file is too large."; 
$uploadOk = 0; 
} 
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg" 
&& $imageFileType != "gif") { 
$error = "Sorry, only JPG, JPEG, PNG & GIF files are allowed."; 
$uploadOk = 0; 
} 
if ($uploadOk == 0) { 
} else { 
if (move_uploaded_file($_FILES["image"]["tmp_name"], $target_file)) { 
    $image = basename($_FILES["image"]["name"]); 
} else { 
    $error = "Sorry, there was an error uploading your file."; 
} 
} 
} 

Answer 1

我已經在我的項目中使用了這個。

$name = round(microtime(true)) . substr(md5(rand()), 0, 4) . '.' . end($temp); 
$newfilename = 'files/uploads/' . $name; 
move_uploaded_file($_FILES["image"]["tmp_name"], $newfilename);