What does this syntax mean in VS code's PHP docs popup: [$time [, $tz]] [duplicate]

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Parameters in PHP documentation, squared brackets? (2 answers)

How to interpret function parameters in software and language documentation? (4 answers)

Closed 1 hour ago .

I am using VS code and working on a Laravel app and came across \Illuminate\Support\Carbon::parse(); as I type this in VS code it shows me the doc for the function and I see this: parse([$time [, $tz]]) - which seems strange. When I looked into the function it looks like it should be called in this way: parse($time, $tz); . So my question is why is this: parse([$time [, $tz]]) the way it is? What is even stranger is that the comma is after the second square bracket!

I think I haven't seen this syntax exactly like that used anywhere else.

Tried googling but found nothing.