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(PECL fann >= 1.0.0)
fann_set_callback — Sets the callback function for use during training
$ann 
   ,   collable  $callback 
   )Sets the callback function for use during training. It means that it is called from fann_train_on_data() or fann_train_on_file() .
ann Neural network resource .
callback The supplied callback function takes following parameters:
NULL  if called from  fann_train_on_file()  
      The callback should return  TRUE . If it returns  FALSE , the training will terminate.
     
Returns  TRUE  on success, or  FALSE  otherwise.