hola como va, en vez de fputs porque no usas fwrite y le das el parametro de peso de archivo asi ignora le magic_quote
Cita:
If the length argument is given, writing will stop after length bytes have been written or the end of string is reached, whichever comes first.
Note that if the length argument is given, then the magic_quotes_runtime configuration option will be ignored and no slashes will be stripped from string .
quedaria asi