我是PHP新手，正在寻找上传后重命名文件（图像）的方法。
我在这里尝试过这个答案（如何在将上传的文件保存到目录之前重命名它？）但出现了很多错误，文件没有上传。
这是我的上传代码：
<?php
if(isset($_POST['btn_upload']))
{
$prodname = $_POST['pname'];
$prodec = $_POST['pdesc'];
$prodprice = $_POST['pprice'];
$prodffers = $_POST['poffers'];
$filetmp = $_FILES["file_img"]["tmp_name"];
$filename = $_FILES["file_img"]["name"];
$filetype = $_FILES["file_img"]["type"];
$filesize = $_FILES["file_img"]["size"];
$fileinfo = getimagesize($_FILES["file_img"]["tmp_name"]);
$filewidth = $fileinfo[0];
$fileheight = $fileinfo[1];
$filepath = "../static/products/".$filename;
$filepath_thumb = "../static/products/thumbs/".$filename;
move_uploaded_file($filetmp,$filepath);
if($filetype == "image/jpeg")
{
$imagecreate = "imagecreatefromjpeg";
$imageformat = "imagejpeg";
}
if($filetype == "image/png")
{
$imagecreate = "imagecreatefrompng";
$imageformat = "imagepng";
}
if($filetype == "image/gif")
{
$imagecreate= "imagecreatefromgif";
$imageformat = "imagegif";
}
$new_width = "400";
$new_height = "400";
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = $imagecreate($filepath); //photo folder
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $filewidth, $fileheight);
$imageformat($image_p, $filepath_thumb);//thumb folder
$sql = "INSERT INTO statement";
$result = mysql_query($sql);
}
?>
请告诉我如何将其重命名为随机名称。
谢谢：）
错误/通知：
Notice: Undefined index: file in C:'wamp'www'
Notice: Undefined variable: newfilename in C:'wamp'www'
Warning: move_uploaded_file() expects parameter 1 to be string, array given in C:'wamp'www'
Warning: imagecreatefromjpeg(../static/products/46149.): failed to open stream: No such file or directory in C:'wamp'www'
Warning: imagecopyresampled() expects parameter 2 to be resource, boolean given in C:'wamp'www'
<?php
if(isset($_POST['btn_upload']))
{
$prodname = $_POST['pname'];
$prodec = $_POST['pdesc'];
$prodprice = $_POST['pprice'];
$prodffers = $_POST['poffers'];
$filetmp = $_FILES["file_img"]["tmp_name"];
$filename = $_FILES["file_img"]["name"];
$filetype = $_FILES["file_img"]["type"];
$filesize = $_FILES["file_img"]["size"];
$fileinfo = getimagesize($_FILES["file_img"]["tmp_name"]);
$filewidth = $fileinfo[0];
$fileheight = $fileinfo[1];
// GETS FILE EXTENSION
$fileextension = pathinfo($filename, PATHINFO_EXTENSION);
$microtime = microtime();
$filepath = "../static/products/".$microtime.".".$fileextension;
$filepath_thumb = "../static/products/thumbs/".$microtime.".".$fileextension;
move_uploaded_file($filetmp,$filepath);
if($filetype == "image/jpeg")
{
$imagecreate = "imagecreatefromjpeg";
$imageformat = "imagejpeg";
}
if($filetype == "image/png")
{
$imagecreate = "imagecreatefrompng";
$imageformat = "imagepng";
}
if($filetype == "image/gif")
{
$imagecreate= "imagecreatefromgif";
$imageformat = "imagegif";
}
$new_width = "400";
$new_height = "400";
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = $imagecreate($filepath); //photo folder
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $filewidth, $fileheight);
$imageformat($image_p, $filepath_thumb);//thumb folder
$sql = "INSERT INTO statement";
$result = mysql_query($sql);
}
?>
这将使用unix时间戳（以毫秒为单位）作为上传的名称，并使上传几乎不可能覆盖其他上传。（如果您只使用rand，则可能会出现这种情况）。我可能也会考虑使用数据库键作为名称的一部分。