Example

function createFromBuiltIn($kernelType, $kernelFirstTerm, $kernelSecondTerm, $kernelThirdTerm)
{
    $string = '';

    if ($kernelFirstTerm != false && strlen(trim($kernelFirstTerm)) != 0) {
        $string .= $kernelFirstTerm;

        if ($kernelSecondTerm != false && strlen(trim($kernelSecondTerm)) != 0) {
            $string .= ','.$kernelSecondTerm;
            if ($kernelThirdTerm != false && strlen(trim($kernelThirdTerm)) != 0) {
                $string .= ','.$kernelThirdTerm;
            }
        }
    }

    $kernel = ImagickKernel::fromBuiltIn(
        $kernelType,
        $string
    );

    return $kernel;
}
    
function fromBuiltIn($kernelType, $kernelFirstTerm, $kernelSecondTerm, $kernelThirdTerm)
{
    $diamondKernel = createFromBuiltIn($kernelType, $kernelFirstTerm, $kernelSecondTerm, $kernelThirdTerm);
    $imagick = renderKernel($diamondKernel);

    header("Content-Type: image/png");
    echo $imagick->getImageBlob();
}