src/Phossa/Query/Clause/WhereTrait.php
public function whereExists(
        SelectStatementInterface $sel, $and = true, $not = false
    ) {
        $ext = $not ? 'NOT EXISTS' : 'EXISTS';
        return $this->where(null, $ext, $sel, $and);
    }
public function whereExists(
        SelectStatementInterface $sel, $and = true, $not = false
    ) {
        $ext = $not ? 'NOT EXISTS' : 'EXISTS';
        return $this->where(null, $ext, $sel, $and);
    }
{@inheritDoc}