PHP to Lasso

I need a quick check so I'm on the right track. Since I'm not used to  
PHP I tend to assume things as I read them. Have I missed anything in  
my conversion from PHP to Lasso below?

PHP
------------------
function invoice_digest($eid, $pno, $secret) {
        $string = $eid . ":" . $pno . ":" . $secret;
        return md5_base64($string);
}

Lasso
------------------
[var: 'key' = $eid+':'+$pno+':'+$secret]
[var: 'invoice_digest' = (Encrypt_MD5: $key)]

Perhaps it could even be: [var: 'invoice_digest' = (Encrypt_MD5: $eid
+':'+$pno+':'+$secret)]  ?

/David



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