src/Neutrino/Database/Schema/Blueprint.php
protected function createReferenceName(array $columns, $on, array $references)
    {
        $strColumns = implode('_', $columns);
        $strReferences = implode('_', $references);

        $rawReferenceName = [$this->table, $strColumns, 'foreign', $on, $strReferences];

        $rawReferenceName = array_map(function ($value) {
            return trim(str_replace(['-', '.'], '_', $value), '_');
        }, $rawReferenceName);

        $rawReferenceName = array_filter($rawReferenceName);

        $index = strtolower(trim(implode('_', $rawReferenceName), '_'));

        return $index;
    }
protected function createReferenceName(array $columns, $on, array $references)
    {
        $strColumns = implode('_', $columns);
        $strReferences = implode('_', $references);

        $rawReferenceName = [$this->table, $strColumns, 'foreign', $on, $strReferences];

        $rawReferenceName = array_map(function ($value) {
            return trim(str_replace(['-', '.'], '_', $value), '_');
        }, $rawReferenceName);

        $rawReferenceName = array_filter($rawReferenceName);

        $index = strtolower(trim(implode('_', $rawReferenceName), '_'));

        return $index;
    }
Create a default index name for the table.

@param  array  $columns
@param  string $on
@param  array  $references

@return string