What do you know about PHP?

Multiple choice questions about PHP programming for you to try.

Question 1: What does PHP represent:
1. Preprocessed Hypertext Page
2. Hypertext Transfer Protocol
3. PHP: Hypertext Preprocessor
4. Hypertext Markup Language
Question 2: The following code, print out the following value
```
 
```
1. first
2. 2
3. 3
4. There is no answer
Question 3: The following code, print out the following value
```
 
```
1. HELLO WORLD!
2. hello world!
3. hello wolrd
4. Failed to run, report an error
Question 4: Which of the following code snippets is used to annotate PHP
1. / * commented code here * /
2. // you are handsome
3. # you are gay
4. All the above comments
Question 5. The default of a variable with no value is shown with the keyword
1. none
2. null
3. undef
4. There is no such concept in PHP
Question 6: What symbols are used when using variables in PHP?
1. $$
2. $
3. @
4. #
Question 7: The following code, print out the following value
```
 
```
1. false
2. true
3. Void
4. true false
Question 8: Which of the following functions is used to declare constants
1. const
2. constants
3. define
4. def
Question 9: The following code, print out the following value
```
 $ var = '0'; 

 if ($ var) { 

 echo 'true'; 

 } else { 

 echo 'false'; 

 } 
```
1. false
2. true
3. void
4. true false
Question 10: Value of the following parameter
```
 $ var = 1/2; 
```
1. first
2. 0
3. 0.5
4. 1/2
Question 11: Access to the word section with value 'd'
```
 $ a = array ( 

 'a', 

 3 => 'b', 

 1 => 'c', 

 'd' 

 ); 
```
1. $ a [1]
2. $ a [2]
3. $ a [3]
4. $ a [4]
Question 12: Which of the following answers is not predetermined by PHP (Magic constants)
1. __LINE__
2. __FILE__
3. __DATE__
4. __METHOD__

Question 13: The following code, print out the following value

 $ a = array (); 

 if ($ a == null) { 

 echo 'true'; 

 } else { 

 echo 'false'; 

 }

true
false
no print
A and B

Question 14: The following code, print out the following value
```
 if (null === false) { 

 echo 'true'; 

 } else { 

 echo 'false'; 

 } 
```
1. true
2. false
3. error
4. A and B
Question 15: The following code, print out the following value
```
 
```
1. 22
2. 11
3. 39
4. 29
Question 16: Where is not the math used in comparison in PHP?
1. ===
2. > =
3. ! =
4. <=>
Question 17: The following code, print out the following value
```
 $ var = 'a'; 

 $ VAR = 'b'; 

 echo "$ var $ VAR"; 
```
1. ab
2. aa
3. bb
4. AB

Question 18: The following code, print out the following value

 $ a = array ( 

 null => 'a', 

 true => 'b', 

 false => 'c', 

 0 => 'd', 

 1 => 'e', 

 '' => 'f' 

 ); 

 echo count ($ a);

Question 19: The following code, print out the following value

 class MyException extends Exception {} 

 try { 

 throw new MyException ('Oops!'); 

 } catch (Exception $ e) { 

 echo "Caught Exception"; 

 } catch (MyException $ e) { 

 echo "Caught MyException"; 

 }