PHP files have a default file extension of..

PHP files have a default file extension of..

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1) Which of the below statements is equivalent to $add += $add ?

2) What will be the output of the following PHP code?

$score = 1234;
 $scoreboard = (array) $score;
 echo $scoreboard[0];

3) Which of following variables can be assigned a value to it?

1. $3hello
2. $_hello
3. $this
4. $This

4) Which of the below symbols is a newline character?

5) We can use _________ to comment a single line?

1. /?
2. //
3. #
4. /* */