Basic PHP
Which of following variables can be assigned a value to it?
1. $3hello
2. $_hello
3. $this
4. $This

Only 2
2 and 4
2, 3 and 4
All of the mentioned

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Basic PHP
Under what circumstance is it impossible to assign a default value to a parameter while declaring a function?

Never
When the function is being declared as a member of a class
When the parameter is Boolean
When the parameter is being declared as passed by reference
When the function contains only one parameter

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