当我尝试上传四个或少于四个文件时，它工作正常。但是当我尝试上传四个以上的文件时，我收到以下错误：
Warning: Invalid argument supplied for foreach() in C:\wamp\www\multiple-file-upload-with-php\index.php on line 16
Notice: Undefined index: files in C:\wamp\www\multiple-file-upload-with-php\index.php on line 16
我正在使用以下 HTML：
<!-- Multiple file upload html form-->
<form action="" method="post" enctype="multipart/form-data">
<input type="file" name="files[]" multiple="multiple" accept="image/*">
<input type="submit" value="Upload">
</form>
和 PHP：
if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST"){
$valid_formats = array("jpg", "png", "gif", "zip", "bmp");
$max_file_size = 1024*100; //100 kb
$path = "uploads/"; // Upload directory
$count = 0;
// Loop $_FILES to execute all files
foreach ($_FILES['files']['name'] as $f => $name) {
if ($_FILES['files']['error'][$f] == 4) {
continue; // Skip file if any error found
}
if ($_FILES['files']['error'][$f] == 0) {
if ($_FILES['files']['size'][$f] > $max_file_size) {
$message[] = "$name is too large!.";
continue; // Skip large files
}
elseif( ! in_array(pathinfo($name, PATHINFO_EXTENSION), $valid_formats) ){
$message[] = "$name is not a valid format";
continue; // Skip invalid file formats
}
else{ // No error found! Move uploaded files
if(move_uploaded_file($_FILES["files"]["tmp_name"][$f], $path.$name)) {
$count++; // Number of successfully uploaded files
}
}
}
}
}
可能是什么问题？