PHP Interview Questions and answers

Using variable interpolation how we can print the following String?

“I am visiting the php interview questions website”.
The word “question” is inside a variable,
$a = ‘question’;

Answer is just,
echo “I am visiting the php interview {$a}s website”;

Basically there are 2 methods how we can define strings,
- Simple strings
- Complex strings

In a php interview, even a well experienced php programmer might forget how this works,
For an example,
a) echo “Hello $what\n”;
b) echo ‘Hello $what\n’;
$what = “World”;

Which will print correctly in to the browser as “Hello World” followed by a new line.
Is it a) or b) ?

The answer is “a”. That is because simple string will print almost all characters literally, where complex string allows special escape sequences to insert special characters.