src/Model.php
protected function is_fillable( $column ) {

		if ( static::$_unguarded ) {
			return true;
		}

		if ( empty( $this->_fillable ) ) {
			return ! in_array( $column, $this->_guarded );
		} else {
			return in_array( $column, $this->_fillable );
		}
	}
protected function is_fillable( $column ) {

		if ( static::$_unguarded ) {
			return true;
		}

		if ( empty( $this->_fillable ) ) {
			return ! in_array( $column, $this->_guarded );
		} else {
			return in_array( $column, $this->_fillable );
		}
	}
Determine if a given attribute is fillable.

@since 2.0

@param string $column

@return bool