我不希望php移动上传的文件覆盖现有文件

我有一个允许用户提交文件的html页面。 下面是我保存提交文件的web服务。但是我不想移动上传的文件来覆盖现有的文件？我该怎么办？多谢各位

$tmpname = $_FILES["image"]["tmp_name"];
$movedname = "submit-img/" . $_POST["category"] . "/" . $_FILES["image"]["name"];
$prevPage = parse_url($_SERVER['HTTP_REFERER']);

move_uploaded_file($tmpname, $movedname);

三思而后行：

if (!is_file($movedname)) {
    move_uploaded_file($tmpname, $movedname);
}

三思而后行：

if (!is_file($movedname)) {
    move_uploaded_file($tmpname, $movedname);
}

---

我认为处理这种情况更有效的方法是检查文件是否存在，在这种情况下，编辑文件名直到找不到匹配的文件，然后上传文件

$x=1;
$newfilename=$movedname;

while(is_file($_SERVER['DOCUMENT_ROOT'].$newfilename)){ //actual control

  $newfilename=$movedname;//to prevent creating flower123.jpg at the third iteration, see below

  $fn=explode(".",$newfilename);
  $fp=count($fn)-2;
  $fn[$fp].=$x;
  //here we get the filename before extension (eg. "flower" in fakepath/flower.jpg) and add $x to get "flower1"

  $newfilename=implode(".",$fn);
  //we rebuild our path having now fakepath/flower1.jpg
  $x++;
}

move_uploaded_file($filevar['tmp_name'], $_SERVER['DOCUMENT_ROOT'].$newfilename);

---

我认为处理这种情况更有效的方法是检查文件是否存在，在这种情况下，编辑文件名直到找不到匹配的文件，然后上传文件

$x=1;
$newfilename=$movedname;

while(is_file($_SERVER['DOCUMENT_ROOT'].$newfilename)){ //actual control

  $newfilename=$movedname;//to prevent creating flower123.jpg at the third iteration, see below

  $fn=explode(".",$newfilename);
  $fp=count($fn)-2;
  $fn[$fp].=$x;
  //here we get the filename before extension (eg. "flower" in fakepath/flower.jpg) and add $x to get "flower1"

  $newfilename=implode(".",$fn);
  //we rebuild our path having now fakepath/flower1.jpg
  $x++;
}

move_uploaded_file($filevar['tmp_name'], $_SERVER['DOCUMENT_ROOT'].$newfilename);

---

您可以通过以下方式进行检查：

if( !is_file($movedname)) {

    move_uploaded_file($tmpname, $movedname);
}

$tmpname = $_FILES["image"]["tmp_name"];  // use timestamp string to prevent overwrite files
$filename = $_FILES["image"]["name"] . '_' . time();

$movedname = "submit-img/" . $_POST["category"] . "/" . $filename;

$prevPage = parse_url($_SERVER['HTTP_REFERER']);

move_uploaded_file($tmpname, $movedname);

或者，如果您想出于其他目的上传同一个文件，也可以按如下操作：

if( !is_file($movedname)) {

    move_uploaded_file($tmpname, $movedname);
}

$tmpname = $_FILES["image"]["tmp_name"];  // use timestamp string to prevent overwrite files
$filename = $_FILES["image"]["name"] . '_' . time();

$movedname = "submit-img/" . $_POST["category"] . "/" . $filename;

$prevPage = parse_url($_SERVER['HTTP_REFERER']);

move_uploaded_file($tmpname, $movedname);

---

您可以通过以下方式进行检查：

if( !is_file($movedname)) {

    move_uploaded_file($tmpname, $movedname);
}

$tmpname = $_FILES["image"]["tmp_name"];  // use timestamp string to prevent overwrite files
$filename = $_FILES["image"]["name"] . '_' . time();

$movedname = "submit-img/" . $_POST["category"] . "/" . $filename;

$prevPage = parse_url($_SERVER['HTTP_REFERER']);

move_uploaded_file($tmpname, $movedname);

或者，如果您想出于其他目的上传同一个文件，也可以按如下操作：

if( !is_file($movedname)) {

    move_uploaded_file($tmpname, $movedname);
}

$tmpname = $_FILES["image"]["tmp_name"];  // use timestamp string to prevent overwrite files
$filename = $_FILES["image"]["name"] . '_' . time();

$movedname = "submit-img/" . $_POST["category"] . "/" . $filename;

$prevPage = parse_url($_SERVER['HTTP_REFERER']);

move_uploaded_file($tmpname, $movedname);

---

有点像如果！文件\u存在$movedname移动\u上载\u文件$tmpname，$movedname；我只是想发布一个答案有点像如果！文件\u存在$movedname移动\u上载\u文件$tmpname，$movedname；我只是想发布一个答案不过，这不会上载我们选择的文件。我认为一种更常见的情况是无论如何都要上传它，更改它的名称以防止覆盖。但这不会上传我们选择的文件。我认为一种更常见的情况是无论如何上传它，更改它的名称以防止覆盖。