SVN, if we submit a file with permission 755 under Linux, there is a svn:excuteable in the SVN attribute.
Only in the local chmod 644 filename.php, can not be caused by modification.
You can remove this executable property from the SVN client in Windows by modifying the file's properties.
A commit will be made again after the remove, so you can also eject the input box that lets you fill in a little note.
As you can see, the file saved in SVN does not store the permissions of the owner and similar 755, only if you have executable permissions, checkout and update are chmod +x for the file.
If the local file does not have chmod +x permission before it commits to the warehouse, the files in the SVN repository will remain in the currently no executable attribute state.
Even after the local chmod +x filename, submitting to the warehouse is useless. When check out to another directory, the file still does not have executable permissions.
You need to use SVN to set the file properties as follows
SVN propset svn:executable on *
And then SVN commit