src/Constraints/Builder.php
public function whereColumn($a, $operator, $b = null)
    {
        $constraint = call_user_func_array(
            [Constraint::class, 'whereColumn'],
            func_get_args()
        );

        return $this->addConstraint($constraint);
    }
public function whereColumn($a, $operator, $b = null)
    {
        $constraint = call_user_func_array(
            [Constraint::class, 'whereColumn'],
            func_get_args()
        );

        return $this->addConstraint($constraint);
    }
public function whereColumn ( $ a , $ operator , $ b = null ) { $ constraint = call_user_func_array ( [ Constraint :: class , 'whereColumn' ] , func_get_args ( ) ) ; return $ this -> addConstraint ( $ constraint ) ; }
Add a "where column" constraint.

@param  string  $a
@param  mixed  $operator
@param  mixed  $b
@return $this
Add a where column constraint .