PHP Online Quiz

Following quiz provides Multiple Choice Questions (MCQs) related to PHP. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Q 1 - Which of the following is true about php variables?

A - Variables can, but do not need, to be declared before assignment.

B - Variables in PHP do not have intrinsic types - a variable does not know in advance whether it will be used to store a number or a string of characters.

C - Variables used before they are assigned have default values.

D - All of the above.

Answer : D

Explanation

All of the above options are correct.

Q 2 - Which of the following is correct about determine the "truth" of any value not already of the Boolean type?

A - If the value is a number, it is false if exactly equal to zero and true otherwise.

B - If the value is a string, it is false if the string is empty (has zero characters) or is the string "0", and is true otherwise.

C - Values of type NULL are always false.

D - All of the above.

Answer : D

Explanation

All of the above options are correct.

Q 3 - Which of the following is correct about constants vs variables in PHP?

A - There is no need to write a dollar sign ($) before a constant, where as in Variable one has to write a dollar sign.

B - Constants cannot be defined by simple assignment, they may only be defined using the define() function.

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

Q 4 - Which of the following keyword terminates the for loop or switch statement and transfers execution to the statement immediately following the for loop or switch?

A - break

B - continue

Answer : A

Explanation

break terminates the for loop or switch statement and transfers execution to the statement immediately following the for loop or switch.

Q 5 - Which of the following variable is used to generate random numbers using PHP?

A - srand()

B - rand()

C - random()

D - None of the above.

Answer : B

Explanation

The PHP rand() function is used to generate a random number. This function can generate numbers with-in a given range. The random number generator should be seeded to prevent a regular pattern of numbers being generated. This is achieved using the srand() function that specifiies the seed number as its argument.

Q 6 - How will you concatenate two strings?

A - Using . operator.

B - Using + operator.

C - Using add() function

D - Using append() function

Answer : A

Explanation

To concatenate two string variables together, use the dot (.) operator.

Q 7 - Which of the following is used to access session variables in PHP?

A - session_start() function

B - $_SESSION[]

C - isset() function

D - session_destroy() function

Answer : B

Explanation

Session variables are stored in associative array called $_SESSION[]. These variables can be accessed during lifetime of a session.

Q 8 - Which of the following contains a reference to every variable which is currently available within the global scope of the script?

Answer : A

Explanation

$GLOBALS − Contains a reference to every variable which is currently available within the global scope of the script. The keys of this array are the names of the global variables.

Q 9 - Which of the following is correct about eregi() function?

A - The eregi() function searches a string specified by string for a string specified by pattern, returning true if the pattern is found, and false otherwise.

B - The eregi() function searches throughout a string specified by pattern for a string specified by string. The search is not case sensitive.

C - The eregi() function searches string for pattern, returning true if pattern exists, and false otherwise.

D - None of the above

Answer : B

Explanation

The eregi() function searches throughout a string specified by pattern for a string specified by string. The search is not case sensitive.

Q 10 - final keyword prevents child classes from overriding a method by prefixing the definition with final?

A - true

B - false

Answer : A

Explanation

PHP 5 introduces the final keyword, which prevents child classes from overriding a method by prefixing the definition with final. If the class itself is being defined final then it cannot be extended.

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