PHP Basics - syntax, variables, data types, operators, control structures, mixing PHP with HTML - One Line Questions

1. Which PHP superglobal array contains all the variables from GET, POST and COOKIE? — `$_REQUEST`
2. PHP variables are case-sensitive. Which of the following are different variables? — `$myVar`, `$myvar`, `$MYVAR`
3. What is the PHP operator for subtraction? — -
4. What is the PHP operator for logical NOT? — !
5. What is the PHP operator for comparison (not equal to)? — !=
6. Which symbol is used to end a PHP code block? — ?>
7. Which operator is used for string concatenation in PHP? — .
8. What is the standard file extension for PHP files? — .php
9. What is the PHP operator for multiplication? — *
10. What is the PHP operator for division? — /
11. What is the syntax for a multi-line comment in PHP? — /* This is a comment */
12. What is the syntax for a single-line comment in PHP? — // This is a comment
13. What is the PHP operator for logical AND? — &&
14. What is the PHP operator for modulo (remainder of division)? — %
15. What is the PHP operator for addition? — +
16. Which symbol is used to start a PHP code block? — <?php
17. Which HTML tag is commonly used to embed PHP code within an HTML document? — It can be embedded anywhere, but the PHP tags <?php ?> are essential.
18. How do you output the value of a PHP variable `$count` within an HTML paragraph tag? — Both A and C
19. What is the PHP operator for assignment? — =
20. What is the PHP operator for comparison (equal to)? — ==
21. What is the PHP operator for comparison (identical to - value and type)? — ===
22. What is the PHP operator for logical OR? — ||
23. What is the result of the expression `5 + '2'` in PHP? — 7
24. What is the result of the expression `'5' + 2` in PHP? — 7
25. What is the result of the expression `'5 apples' + 2` in PHP? — 7
26. Which PHP data type is used to store arrays? — Array
27. Which PHP data type can store one of two values: TRUE or FALSE? — Boolean
28. In a switch statement, what keyword is used to end a case and move to the next? — break
29. Which PHP construct is used to define a constant? — define() function
30. Which loop structure executes the code block once, and then continues as long as a condition is true? — do...while loop
31. Which PHP data type is used to store decimal numbers? — Float
32. Which loop structure is used when you know how many times you want to loop? — for loop
33. Which loop structure is used to iterate over arrays and objects? — foreach loop
34. Consider the following PHP code snippet: `$name = 'World'; echo 'Hello, ' . $name . '!';` What will be the output? — Hello, World!
35. Which control structure is used to execute a block of code only if a specified condition is true? — if statement
36. Which control structure is used to execute a block of code if a condition is true, and another block if the condition is false? — if...else statement
37. Which PHP data type is used to store whole numbers? — Integer
38. Which control structure allows you to execute a block of code multiple times? — Loop
39. What is the default value for a variable that has been declared but not assigned a value in PHP? — NULL
40. Which PHP data type represents an object that has no value? — NULL
41. What is the PHP function used to output a string and can accept multiple arguments? — printf
42. Which PHP data type is used to store text? — String
43. Which control structure is used to execute different blocks of code based on the value of a variable? — switch statement
44. What is the purpose of the `empty()` function in PHP? — To check if a variable is empty, false, 0, '0', NULL, or an empty array.
45. What is the purpose of mixing PHP with HTML? — To generate dynamic HTML content based on server-side logic.
46. If you have an HTML form with a GET method, how can you access the submitted data in PHP? — Using the `$_GET` superglobal array.
47. If you have an HTML form with a POST method, how can you access the submitted data in PHP? — Using the `$_POST` superglobal array.
48. How do you declare a variable in PHP? — Using the '$' symbol followed by the variable name.
49. How can you output a variable's value within an HTML context using PHP? — All of the above.
50. Which loop structure continues as long as a condition is true? — while loop
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