-2 
<html>

<body>
<form action="upload.php" method="post"
enctype="multipart/form-data">
<label for="file">Filename:</label>
<input type="file" name="file_field"><br>
<input type="submit" name="submit" value="Submit">
</form>

</body>
</html>

我收到如下错误消息： 

Notice: Undefined variable: file_field in C:\xampp\htdocs\upload.php on line 113

我尝试$file_field在页面顶部进行定义，但问题是我没有在 MySQL 数据库中获取文件名，而是得到了只是Array并且我还收到以下错误： 

Notice: Array to string conversion in C:\xampp\htdocs\upload.php on line 114

有人知道吗？帮助。

<?php

function uploadFile ($file_field = null, $check_image = false, $random_name = false) {

//Config Section    
//Set file upload path
$path = 'c:/xampp/htdocs/images/'; //with trailing slash
//Set max file size in bytes
$max_size = 1000000;
//Set default file extension whitelist
$whitelist_ext = array('jpg','png','gif');
//Set default file type whitelist
$whitelist_type = array('image/jpeg', 'image/png','image/gif');

//The Validation
// Create an array to hold any output
$out = array('error'=>null);

if (!$file_field) {
$out['error'][] = "Please specify a valid form field name";           
}

if (!$path) {
$out['error'][] = "Please specify a valid upload path";               
}

if (count($out['error'])>0) {
return $out;
}

//Make sure that there is a file
if((!empty($_FILES[$file_field])) && ($_FILES[$file_field]['error'] == 0)) {

// Get filename
$file_info = pathinfo($_FILES[$file_field]['name']);
$name = $file_info['filename'];
$ext = $file_info['extension'];

//Check file has the right extension           
if (!in_array($ext, $whitelist_ext)) {
$out['error'][] = "Invalid file Extension";
}

//Check that the file is of the right type
if (!in_array($_FILES[$file_field]["type"], $whitelist_type)) {
$out['error'][] = "Invalid file Type";
}

//Check that the file is not too big
if ($_FILES[$file_field]["size"] > $max_size) {
$out['error'][] = "File is too big";
}

//If $check image is set as true
if ($check_image) {
if (!getimagesize($_FILES[$file_field]['tmp_name'])) {
$out['error'][] = "Uploaded file is not a valid image";
}
}

//Create full filename including path
if ($random_name) {
// Generate random filename
$tmp = str_replace(array('.',' '), array('',''), microtime());

if (!$tmp || $tmp == '') {
$out['error'][] = "File must have a name";
}     
$newname = $tmp.'.'.$ext;                                
} else {
$newname = $name.'.'.$ext;
}

//Check if file already exists on server
if (file_exists($path.$newname)) {
$out['error'][] = "A file with this name already exists";
}

if (count($out['error'])>0) {
//The file has not correctly validated
return $out;
} 

if (move_uploaded_file($_FILES[$file_field]['tmp_name'], $path.$newname)) {
//Success
$out['filepath'] = $path;
$out['filename'] = $newname;
return $out;
} else {
$out['error'][] = "Server Error!";
}

} else {
$out['error'][] = "No file uploaded";
return $out;
}      
}
$con = mysql_connect("localhost","root","");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("simple_login", $con);

mysql_query("INSERT INTO photo (photo)
VALUES ('$file_field')");


mysql_close($con);
?>
4

2 回答 2

0

$file_field 在其范围之外被调用

如果要解决此问题，请使用 global 关键字

global $file_field

请阅读PHP Global

于 2012-12-26T05:42:31.927 回答
0

You Should use $_FILES['file_field'] instead of $file_field.

it's not needed to pass $file_field variable to function.

Modified Version of Your Code 

function uploadFile ($check_image = false, $random_name = false) {

//Config Section    
//Set file upload path
$path = 'c:/xampp/htdocs/images/'; //with trailing slash
//Set max file size in bytes
$max_size = 1000000;
//Set default file extension whitelist
$whitelist_ext = array('jpg','png','gif');
//Set default file type whitelist
$whitelist_type = array('image/jpeg', 'image/png','image/gif');

//The Validation
// Create an array to hold any output
$out = array('error'=>null);

if (!$_FILES['file_field']) {
$out['error'][] = "Please specify a valid form field name";           
}

if (!$path) {
$out['error'][] = "Please specify a valid upload path";               
}

if (count($out['error'])>0) {
return $out;
}

//Make sure that there is a file
if((!empty($_FILES['file_field']['name'])) && ($_FILES['file_field']['error'] == 0)) {

// Get filename
$file_info = pathinfo($_FILES['file_field']['name']);
$name = $file_info['filename'];
$ext = $file_info['extension'];

//Check file has the right extension           
if (!in_array($ext, $whitelist_ext)) {
$out['error'][] = "Invalid file Extension";
}

//Check that the file is of the right type
if (!in_array($_FILES['file_field']["type"], $whitelist_type)) {
$out['error'][] = "Invalid file Type";
}

//Check that the file is not too big
if ($_FILES['file_field']["size"] > $max_size) {
$out['error'][] = "File is too big";
}

//If $check image is set as true
if ($check_image) {
if (!getimagesize($_FILES['file_field']['tmp_name'])) {
$out['error'][] = "Uploaded file is not a valid image";
}
}

//Create full filename including path
if ($random_name) {
// Generate random filename
$tmp = str_replace(array('.',' '), array('',''), microtime());

if (!$tmp || $tmp == '') {
$out['error'][] = "File must have a name";
}     
$newname = $tmp.'.'.$ext;                                
} else {
$newname = $name.'.'.$ext;
}

//Check if file already exists on server
if (file_exists($path.$newname)) {
$out['error'][] = "A file with this name already exists";
}

if (count($out['error'])>0) {
//The file has not correctly validated
return $out;
} 

if (move_uploaded_file($_FILES['file_field']['tmp_name'], $path.$newname)) {
//Success
$out['filepath'] = $path;
$out['filename'] = $newname;
return $out;
} else {
$out['error'][] = "Server Error!";
}

} else {
$out['error'][] = "No file uploaded";
return $out;
}      
}
$con = mysql_connect("localhost","root","");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("simple_login", $con);

mysql_query("INSERT INTO photo (photo)
VALUES ('{$_FILES[file_field][tmp_name]}')");
/*
it's better to save it like this :
$content = file_get_contents($_FILES['file_field']['tmp_name']);
$content = base64_encode($data);
$content = mysql_real_escape_string($content);
mysql_query("INSERT INTO photo (photo)
VALUES ('{$content}')");
// but you can later use base64_decode() to convert data.
*/

mysql_close($con);
?>
于 2012-12-26T05:56:51.250 回答