Which of these variable names are valid in php8.1: `$012mobile` or `$привет`?
Anonymous Quiz
8%
Both are valid
22%
Only `$012mobile` is valid
51%
Only `$привет` is valid
19%
Both invalid
Which of these function calls will significantly increase the used memory (imagine we measure the memory peak usage before and after function call)?
Anonymous Quiz
22%
`unset_first` and `add_new`
17%
`add_new`
22%
`get_count` and `unset_first`
30%
`unset_first`
4%
All of them
4%
None of them