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

2, 3 and 4
2 and 4
Only 2
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?

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

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