0
当我提出这个功能：PHP：制作缩略图，为什么我得到这些错误？
function makeThumbnail($type, $name, $size, $tmp_name, $thumbSize) {
//make sure this directory is writable!
$path_thumbs = "uploaded_files/";
//the new width of the resized image, in pixels.
$img_thumb_width = $thumbSize; //
$extlimit = "yes"; //Limit allowed extensions? (no for all extensions allowed)
//List of allowed extensions if extlimit = yes
$limitedext = array(".gif",".jpg",".png",".jpeg",".bmp");
//the image -> variables
$file_type = $type;
$file_name = $name;
$file_size = $size;
$file_tmp = $tmp_name;
//check if you have selected a file.
echo $file_tmp."<br>";
echo $file_name."<br>";
echo $file_type."<br>";
echo $file_size."<br>";
if(!is_uploaded_file($file_tmp)){
echo "Error: Please select a file to upload!. <br>--<a href=\"$_SERVER[PHP_SELF]\">back</a>";
exit(); //exit the script and don't process the rest of it!
}
//check the file's extension
$ext = strrchr($file_name,'.');
$ext = strtolower($ext);
//uh-oh! the file extension is not allowed!
if (($extlimit == "yes") && (!in_array($ext,$limitedext))) {
echo "Wrong file extension. <br>--<a href=\"$_SERVER[PHP_SELF]\">back</a>";
exit();
}
//so, whats the file's extension?
$getExt = explode ('.', $file_name);
$file_ext = $getExt[count($getExt)-1];
//create a random file name
$rand_name = md5(time());
$rand_name= rand(0,999999999);
//the new width variable
$ThumbWidth = $img_thumb_width;
/////////////////////////////////
// CREATE THE THUMBNAIL //
////////////////////////////////
//keep image type
if($file_size){
if($file_type == "image/pjpeg" || $file_type == "image/jpeg"){
$new_img = imagecreatefromjpeg($file_tmp);
}elseif($file_type == "image/x-png" || $file_type == "image/png"){
$new_img = imagecreatefrompng($file_tmp);
}elseif($file_type == "image/gif"){
$new_img = imagecreatefromgif($file_tmp);
}
//list the width and height and keep the height ratio.
list($width, $height) = getimagesize($file_tmp);
//calculate the image ratio
$imgratio=$width/$height;
if ($imgratio>1){
$newwidth = $ThumbWidth;
$newheight = $ThumbWidth/$imgratio;
}else{
$newheight = $ThumbWidth;
$newwidth = $ThumbWidth*$imgratio;
}
//function for resize image.
if (function_exists(imagecreatetruecolor)){
$resized_img = imagecreatetruecolor($newwidth,$newheight);
}else{
die("Error: Please make sure you have GD library ver 2+");
}
//the resizing is going on here!
imagecopyresampled($resized_img, $new_img, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
//finally, save the image
ImageJpeg ($resized_img,"$path_thumbs/$rand_name.$file_ext", 100);
ImageDestroy ($resized_img);
ImageDestroy ($new_img);
}
//ok copy the finished file to the thumbnail directory
// move_uploaded_file ($file_tmp, "$path_big/$rand_name.$file_ext");
/*
Don't want to copy it to a separate directory?
Want to just display the image to the user?
Follow the following steps:
2. Uncomment this code:
/*
/* UNCOMMENT THIS IF YOU WANT */
echo "OK THUMB " . $thumbSize;
exit();
//*/
//and you should be set!
//success message, redirect to main page.
$msg = urlencode("$title was uploaded! <a href=\"Resize.php\">Upload More?</a>");
}
然后停止工作，而是一个功能外，它的工作好。
正如你所看到的，我添加了“echo $ file ....”，因为我想看看它们是否有价值，并且它们确实具有正确的值。
我刚刚得到错误错误：请选择一个文件上传。
该功能在正常上传图像脚本（全尺寸）后运行。
当我调用该函数我这样做：
makeThumbnail($_FILES[$fieldname]['type'], $_FILES[$fieldname]['name'], $_FILES[$fieldname]['size'], $_FILES[$fieldname]['tmp_name'], 100);
在我的其他文件，其中它不是在一个函数，世界上没有区别仅在于变量是：
$file_type = $_FILES['file']['type'];
$file_name = $_FILES['file']['name'];
$file_size = $_FILES['file']['size'];
$file_tmp = $_FILES['file']['tmp_name'];
但它应该工作，我找不到任何错误，但它并没有，我不断收到错误。如果我删除了is_uploaded_file函数，我收到了一堆其他错误。
请先调试一下。什么是'print_r（$ _ FILES）'包含的内容？ '$ tmp_name'指向一个现有的文件吗？ – 2010-09-01 12:46:50
嗨，用'is_uploaded_file'函数传递的文件名即使在Windows上也是区分大小写的！在Windows上，PHP倾向于使用像％TEMP％这样的环境变量来确定上传文件夹，并且这些环境变量有时与实际路径具有不同的大小写。 – klennepette 2010-09-01 12:48:34