无法打开文件进行写入
我正在尝试写入文件。在执行 fopen 之前，我对其进行了 file_exists 检查，它返回 true （该文件确实存在）。
但是，该文件失败了此代码，并且每次都会给出错误：
$handle = fopen($filename, 'w');
if($handle)
{
flock($handle, LOCK_EX);
fwrite($handle, $contents);
}
else
{
echo 'ERROR: Unable to open the file for writing.',PHP_EOL;
exit();
}
flock($handle, LOCK_UN);
fclose($handle);
有没有办法获得更具体的错误详细信息，以了解为什么该文件不允许我打开它进行写入？我知道该文件名是合法的，但由于某种原因它不允许我写入它。我确实有写权限，我能够写入并覆盖另一个文件。
I am trying to write to a file. I do a file_exists check on it before I do fopen and it returns true (the file does exist).
However, the file fails this code and gives me the error every time:
$handle = fopen($filename, 'w');
if($handle)
{
flock($handle, LOCK_EX);
fwrite($handle, $contents);
}
else
{
echo 'ERROR: Unable to open the file for writing.',PHP_EOL;
exit();
}
flock($handle, LOCK_UN);
fclose($handle);
Is there a way I can get more specific error details as to why this file does not let me open it for writing? I know that the filename is legit, but for some reason it just wont let me write to it. I do have write permissions, I was able to write and write over another file.
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评论（4）
文件存在并不意味着您有权写入该文件。在尝试写入文件之前，您应该使用
is_writable。Just because the file exists doesn't mean that you have permission to write to it. Before trying to write to a file, you should check to see if PHP has permission to do so using
is_writable.或获取错误的一般方法：
查看实际的错误消息
or general way of getting errors:
to see the actual error message
如果您使用的是 php 5.2+，您可能会对 error_get_last() 感兴趣。
在您的开发系统上，您还可以通过 error_reporting() 在脚本中提高错误报告级别，或者（最好是）在你的 php.ini 中。
If you're using php 5.2+ you might be interested in error_get_last().
On your development system you can also increase the error reporting level, either within the script via error_reporting() or (preferably) in your php.ini.
听起来您正在写入的目录没有正确的权限。
Sounds like the directory you're writing to doesn't have the correct permissions.