PHP fopen（）创建没有权限修改文件的文件(PHP fopen() creating file without permissions to modify it)

 从apache调用的PHP脚本执行以下操作： 
 
$h = fopen(getcwd()."tmp.txt","w");
fprintf($h,"hi");
fclose($h);
 
 生成一个拥有644权限的个人用户ID所拥有的文件。 但是，再次执行脚本会导致错误，因为Apache / PHP以用户wwwrun身份运行，因此没有权限覆盖文件或chmod它。 
 
 放置文件的目录位于我的主目录中，具有777权限。 如何让PHP创建由wwwrun拥有的文件，或者使用666权限创建它，或者执行其他操作，以允许它被PHP覆盖。 
 
 我理想地寻找一种解决方案，该解决方案也适用于PHP通过使用exec函数调用的外部程序创建文件的情况; 这似乎遇到了同样的问题，因为外部程序以wwwrun运行，但外部程序创建的文件由我的个人用户ID拥有。 

Executing the following from a PHP script called by apache:
 
$h = fopen(getcwd()."tmp.txt","w");
fprintf($h,"hi");
fclose($h);
 
generates a file owned by my personal userid with 644 permissions. However, executing the script again results in an error, since Apache/PHP is running as user wwwrun and so doesn't have the permissions to overwrite the file or to chmod it.
 
The directory that the files are being placed is in my home directory and has 777 permissions. How can I get PHP to either create the file as owned by wwwrun, or create it with 666 permissions, or do something else, to allow it to be overwritten by PHP.
 
I am ideally looking for a solution which also applies to the situation where the file is created by PHP via an external program called with the exec function; this seems to suffer from the same problem, in that the external program runs as wwwrun, but files created by the external program are owned by my personal userid.

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