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Which line shows a function with a nullable parameter?

function testMe(?string $firstName){}

function testMe(null $firstName){}

function testMe($firstName){}

What is the output of the following code?

* click on the image to enlarge

a fatal error

foo

bar

foobar

What is the result of the following code?

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stdclass

empty result

an error

warning about calling an empty function

warning about $param being assigned a null value while not nullable

What does the following code output?

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string(11) "my_function"

An instance of exception TypeError is thrown

my_function

No output

What does the following code output?

string(11) "my_functlon"

An instance of TypeError exception is thrown

my_function

Empty output

What is the output when the following code is run?

constructors

An error

Pworld

Phelloworld

world

What is the output when the following code is run?

* click on the image to enlarge

Pworld

An error

helloPworld

world

Which are validPHP tags? (choose all that apply)

Which answers will output 'bool(true)' when the code is run? (choose 2)

$x = NULL + TRUE; var_dump($x);

$x = 1; var_dump($x);

$x = false !== FALSE; var_dump($x);

$x = (bool) false; var_dump($x);

What is the output when the following code is run?

echo 3 + 015 + -4 + 0x21 + 0b110;

21

30

145

51

What is the output of the following code:

echo 'C:\\Windows\System32';

C:\\Windows\System32

C:\Windows\System32

C:WindowsSystem32

C:\Windows ystem32

Which of the following answers will NOT produce an error? (choose 2)

$test = { 'test', 'foo' }; echo $test[2];

$test=array('foo', 'bar'); echo $test[2];

list(test)=['test', 'foo', 'bar']; echo $test[2];

$test= 'test, one, two'; echo $test[2];

What is the output when the following code is run?

$b = (object) ['foo' => 'bar'];
$b->foo;

an error

foo

bar

no output

What is the output when the following code is run?

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hello Paul

an error

no output

It outputs "hello Paul", but with a warning

Which answers produce 'Hello Paul' as output provided that $user['firstname'] contains 'Paul'? (choose 2)

echo "Hello " . $user["firstname"];

echo "Hello '$user[firstname]'";

echo "Hello {$user['firstname']}";

echo Hello $user['firstname'];

What is the output when the following code is run?

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bar

baz

an error

a warning

What is the output when the following code is run?

call_user_fun

bar

baz

an error

a warning

What is the output when the following code is run?

* click on the image to enlarge

33 equals six

6

3 equals six

an error

What would the output be, if the following code was run?

echo multiline

An error

Shout out, to PHP

Shout out,<br /> to PHP

Shout out

What would the output be if the following code was run on the command-line?
asp tags

That's for another day

An error

That's for another day - but with a warning

What is the output when the following code is run?
short tags

That's for another day

An error

No output

What is the output of the following code?
short tags

No output

An error

That's for another day

What is the output of the following code?
echo string

This is a test

An error

No output

What is the output of the following code?
echo string

No output

An error

This is a test

<?php echo 'This is a test'

What is the output of the following code?
echo string

An error

This is a test

No output

<?php echo 'This is a test';

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