Add rule to block use of isset with multiple arguments

[rmccue]

IMO, isset( $a, $b ) is unclear, and there's no good reason to use it instead of the more explicit isset( $a ) && isset( $b )

Anyone have strong thoughts either way on this?

[pdewouters]

I don't see it used that often, I don't think most people even know you can do that. But I don't think it unclear.

[fklein-lu]

I do prefer the isset( $a ) && isset( $b ) version, as it contains the logical operators, which isset( $a, $b ) does not. Or said differently the first version is clear, even if your understanding of PHP is moderate, the second one requires you to understand what this particular function does in detail.

[tfrommen]

Closed as per 6ad1fc9.