[PHP] Generate a sendmany with multiple outputs to the same address

[SgtSpike]

Yeah, it's a bummer that you cannot specify the same address twice - I once suffered from this as well, but a workaround was fairly simple, especially in PHP.

A bigger issue I've had with sendmany is that the command requires the "<fromaccount>" parameter and you cannot just say to it like "whatever account"...
So the way I use my client, having coins spread across several "accounts" (which I personally only use to label addresses), then it seems like someone had made this parameter mandatory just to piss me off...

What was the workaround?

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[piotr_n]

What was the workaround?

Well, it's a workaround only if you're fine with single transaction per a recipient address (I was).
In such case, just sum up the amounts using a map with the destination address as the key.
Something like:

Code:

$addrs = array();
for(...) {
    $destaddr = ...
    $amount = ...
    if (array_key_exists($destaddr, $addrs)) {
        $addrs[$destaddr] += $amount;
    } else {
        $addrs[$destaddr] = $amount;
    }
}

After this you have only single addresses in $addrs (with the amounts summed up), so just:

Code:

$rpc = 'sendmany "'.ACCOUNT.'" \'{';
$com = false;
foreach(array_keys($addrs) as $da) {
	$am = round($addrs[$da], 8);
	if ($am>0) {
		if ($com)  $rpc .= ', ';
		$rpc .= '"'.$da.'":'.sprintf('%.8f',$am);
		$com = true;
	}
}
$rpc .= '}\'';

[mrvision]

How did this guy accomplish it when sending coins my way then?

http://blockchain.info/tx/67b9c10df1098152080baade7e3aab5cfa475ae154cf27000d1f000e370e65d2?show_adv=true

TXOUT Amounts?
0.00100000
0.00100000
0.01000010
0.01001101
0.01001110
0.01100001
0.01100011
0.01100011
0.01100100
0.01100101
0.01100101
0.01100110
0.01101001
0.01101001
0.01101001
0.01101100
0.01101110
0.01110010
0.01110100
0.01110101
0.49730788
0.80211920

It says "Nice Minecraft Build" xD

[cmilian]

What was the workaround?

Well, it's a workaround only if you're fine with single transaction per a recipient address (I was).
In such case, just sum up the amounts using a map with the destination address as the key.
Something like:

Code:

$addrs = array();
for(...) {
    $destaddr = ...
    $amount = ...
    if (array_key_exists($destaddr, $addrs)) {
        $addrs[$destaddr] += $amount;
    } else {
        $addrs[$destaddr] = $amount;
    }
}

After this you have only single addresses in $addrs (with the amounts summed up), so just:

Code:

$rpc = 'sendmany "'.ACCOUNT.'" \'{';
$com = false;
foreach(array_keys($addrs) as $da) {
	$am = round($addrs[$da], 8);
	if ($am>0) {
		if ($com)  $rpc .= ', ';
		$rpc .= '"'.$da.'":'.sprintf('%.8f',$am);
		$com = true;
	}
}
$rpc .= '}\'';

This look like what i need. where did you add this code?