Basic PHP
What is the value of $a and $b after the function call?
function doSomething( &$arg ) {
$return = $arg;
$arg += 1;
return $return;
}
$a = 3;
$b = doSomething( $a );

Both are 4
a is 4 and b is 3
Both are 3
a is 3 and b is 4

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Basic PHP
How does the identity operator === compare two values?

It bases its comparison on the C strcmp function exclusively
If the two values are strings, it performs a lexical comparison
It converts both values to strings and compares them
It converts them to a common compatible data type and then compares the resulting values
It returns True only if they are both of the same type and value

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