更新图像路径

Question

我对PHP编程还很陌生，我环顾四周，但我仍然感到困惑。我试图更新我的用户表中的图像路径，我不太确定如何去做。这是我将图像放入数据库的代码，它可以插入图像，但我不确定如何更新数据库中的图像图片路径以使用新插入的图像，而不是使用者当他们创建一个帐户时选择。

// Make sure we didn't have an error uploading the image 
($_FILES[$image_fieldname]['error'] == 0) 
or handle_error("the server couldn't upload the image you selected.", 
$php_errors[$_FILES[$image_fieldname]['error']]); 

// Is this file the result of a valid upload? 
@is_uploaded_file($_FILES[$image_fieldname]['tmp_name']) 
or handle_error("you were trying to do something naughty. Shame on you!", 
"upload request: file named " . 
"'{$_FILES[$image_fieldname]['tmp_name']}'"); 

// Is this actually an image? 
@getimagesize($_FILES[$image_fieldname]['tmp_name']) 
or handle_error("you selected a file for your picture " . 
"that isn't an image.", 
"{$_FILES[$image_fieldname]['tmp_name']} " . 
"isn't a valid image file."); 

// Name the file uniquely 
$now = time(); 
while (file_exists($upload_filename = $upload_dir . $now . 
'-' . 
$_FILES[$image_fieldname]['name'])) { 
$now++; 
} 

// Finally, move the file to its permanent location 
@move_uploaded_file($_FILES[$image_fieldname]['tmp_name'], $upload_filename) 
or handle_error("we had a problem saving your image to " . 
"its permanent location.", 
"permissions or related error moving " . 
"file to {$upload_filename}"); 

$insert_sql = "UPDATE users set user_pic_path WHERE user_id = $user_id = 
replace(user_pic_path, '$upload_filename', '$upload_filename'); 

//insert the user into the database 
mysql_query($insert_sql); 
</code> 

编辑： 我失踪了“这是我固定的，现在还没有SQL错误，它把图片放到数据库，但不能取代在数据库中的图像路径我已经搞乱？在$ INSERT_SQL，但它仍然没有更新为新图像路径数据库，我能做些什么这是我的新的更新代码：

<code> 
$insert_sql = "UPDATE users WHERE user_id = $user_id set user_pic_path = 
replace(user_pic_path, '$upload_filename', '$upload_filename')"; 
</code> 

Answer 1

在最后的线，插入您的SQL的一个试验：

$insert_sql = "UPDATE users WHERE user_id = $user_id set user_pic_path = replace(user_pic_path, '$upload_filename', '$upload_filename')"; 

// check the query 
echo $insert_sql."<br />"; 

//insert the user into the database 
mysql_query($insert_sql); 

然后，您可以观看您要运行的查询，在PHPMyAdmin中测试它，确定它应该是什么。对其他关键变量也是值得的。更好的是，您应该编写一个“调试”功能，记录服务器上文件中发生的情况，以便发生错误时可以跟踪其详细信息，包括每个文件中的关键变量值。