VB6 (Custom RC4) To PHP

I need help to convert this VB function:

Code:

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Public Function RC4(ByVal Data As String, ByVal Password As String) As String ' This is a Modified RC4 Function ^^
On Error Resume Next
Dim F(0 To 255) As Integer, X, Y As Long, Key() As Byte
Key() = StrConv(Password, vbFromUnicode)
For X = 0 To 255
    Y = (Y + F(X) + Key(X Mod Len(Password))) Mod 256
    F(X) = X
Next X
Key() = StrConv(Data, vbFromUnicode)
For X = 0 To Len(Data)
    Y = (Y + F(Y) + 1) Mod 256
    Key(X) = Key(X) Xor F(Temp + F((Y + F(Y)) Mod 254))
Next X
RC4 = StrConv(Key, vbUnicode)
End Function

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to PHP function.
Thank you.

The PHP website (www.php.net) has an excellent manual. I would also advise against using the above function because it is not an RC4 implementation (in fact there is a bug in your key scheduling that will result in the same key whatever password you use). The cipher text produced from this would be about as secure as a door made from jelly; I suggest you remove this code from any application you are currently using it in.

PHP supports a number of recognised encryption libraries (http://uk3.php.net/manual/en/refs.crypto.php). I suggest you use one of these.