FS_CHMOD_FILE
FS_CHMOD_FILE = 420 & ~umask()
Specifies the permissions for files. (by default = 0644)
How to set this constant:
<?php
define( "FS_CHMOD_FILE", ( 0644 & ~ umask() ) );
?>
Defined only in the admin panel when connected: wp-admin/includes/file.php
where ( 0644 & ~ umask() ) is:
the '&' (ampersand) is the 'And' bitwise operator,
the '~' (tilde) is the 'Not' bitwise operator,
the umask() function returns the current umask