Description:
------------
fgets calls will keep returning false if a fd has at some point reached end-of-file, even though the pointer is no longer at EOF.  feof() will also keep returning true.

Using fread() instead of fgets() works, but is inconvenient if you'd like to read just one line at a time.

Reproduce code:
---------------
  $fdw = fopen("test", "w");
  $fdr = fopen("test", "r");

  fputs($fdw, "testing 1..\n");
  var_dump(fgets($fdr, 0xff));
  var_dump(fgets($fdr, 0xff));
  fputs($fdw, "testing 2..\n");
  var_dump(fgets($fdr, 0xff));



Expected result:
----------------
string(12) "testing 1..
"
bool(false)
string(12) "testing 2..
"


Actual result:
--------------
string(12) "testing 1..
"
bool(false)
bool(false)