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This plug-in will damage php files?

Do not worry, this plug-php files to delete only the beginning and end of the blank lines, it will not delete files Central blank lines, and it will not affect your php process running, if you still do not trust, you can first do file back up, and then run this plug-in to fix feed error. If it affects your php code, you can rename .bak to .php, then your original php files.

if php file is not writable, how to do?

If your os is the windows, please check your file whether is read-only, so, in the Explorer right-click the file, choose Properties, uncheck read-only attribute, and then click "ok" button, final your file can be written..

If your os is linux, using ftp or WinSCP into your server, find the file, right-click the file, choose Properties, please set file permissions to 777, and then click "ok" button, final your file can be written..

If it is linux of ssh login, then enter the server, to find documents, use chmod command to set permissions, for example:.

 chmod 777 test.php.

final you can write documents.