php-armadillo/stubs/impl/CxDCol.php

<?php

namespace Arma;

class CxDCol extends Col
{
    /**
     * Construct a complex column vector out of two non-complex column vectors.
     *
     * @param DCol $real
     * @param DCol $imag
     * @return CxDCol
     */
    static function fromCols($real, $imag) {
        return new CxDCol;
    }
}

class_alias(CxDCol::class, 'Arma\\CxDVec');