PHP Functions Questions and Answers

This set of PHP Multiple Choice Questions & Answers (MCQs) focuses on “Functions – 1”.

1. What will be the output of the following PHP code?

```
    <?php
```
```
    function calc($price, $tax="")
```
```
    {
```

        $total = $price + ($price * $tax);

```
        echo "$total"; 
```
```
    }
```
```
    calc(42);    
```
```
    ?>
```

a) Error
b) 0
c) 42
d) 84
View Answer

Answer: c
Explanation: You can designate certain arguments as optional by placing them at the end of the list and assigning them a default value of nothing.

2. What will be the output of the following PHP code?

```
    <?php
```
```
    function a()
```
```
    {
```
```
        function b()
```
```
        {
```
```
            echo 'I am b';
```
```
        }
```
```
        echo 'I am a';
```
```
    }
```
```
    a();
```
```
    a();
```
```
    ?>
```

a) I am b
b) I am bI am a
c) Error
d) I am a Error
View Answer

Answer: d
Explanation: This will be the output- I am a Fatal error: Cannot redeclare b()

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3. What will be the output of the following PHP code?

```
    <?php
```
```
    function a()  
```
```
    {
```
```
        function b()
```
```
        {
```
```
            echo 'I am b';
```
```
        }
```
```
        echo 'I am a';
```
```
    }
```
```
    b();
```
```
    a();
```
```
    ?>
```

a) I am b
b) I am bI am a
c) Error
d) I am a Error
View Answer

Answer: c
Explanation: This will be the output- Fatal error: Call to undefined function b(). You cannot call a function which is inside a function without calling the outside function.

4. What will be the output of the following PHP code?

```
    <?php
```
```
    $op2 = "blabla";
```
```
    function foo($op1)
```
```
    {
```
```
        echo $op1;
```
```
        echo $op2;
```
```
    }
```
```
    foo("hello");
```
```
    ?>
```

a) helloblabla
b) error
c) hello
d) helloblablablabla
View Answer

Answer: c
Explanation: If you want to put some variables in function that was not passed by it, you must use “global”. Inside the function type global $op2.

5.What will be the output of the following PHP code?

```
    <?php
```
```
        function foo($msg)
```
```
        {
```
```
            echo "$msg";
```
```
        }
```
```
        $var1 = "foo";
```
```
        $var1("will this work");
```
```
    ?>
```

a) error
b) $msg
c) 0
d) will this work
View Answer

Answer: d
Explanation:It is possible to call a function using a variable which stores the function name.

6. What will be the output of the following PHP code?

```
    <?php
```
```
       echo "chr(52)";
```
```
    ?>
```

a) 1
b) 2
c) 3
d) 4
View Answer

Answer: d
Explanation: The chr() function returns a character from the specified ASCII value. Since the ASCII value of 4 is 52, thus 4 was displayed.

7. What will be the output of the following PHP code?

```
    <?php
```
```
        echo ord ("hi");
```
```
    ?>
```

a) 106
b) 103
c) 104
d) 209
View Answer

Answer: c
Explanation: The ord() function returns the ASCII value of the first character of a string. The ASCII value of h is 104, thus 104 was displayed.

8. What will be the output of the following PHP code?

```
  <?php
```
```
      echo(atan(0.50));
```
```
  ?>
```

a) 0.11845976421345
b) 0.23568451142521
c) 0.46364760900081
d) 1
View Answer

Answer: c
Explanation: The atan() function returns the arc tangent of arg as a numeric value between -Pi/2 and Pi/2 radians.

9. What will be the output of the following PHP code?

```
   <?php
```

       define("GREETING","Hello you! How are you today?");

```
       echo constant("GREETING");
```
```
   ?>
```

a) Hello you! How are you today?
b) GREETING
c) GREETING, Hello you! How are you today?
d) “GREETING”,”Hello you! How are you today?”
View Answer

Answer: a
Explanation: The define() function defines a constant.

10. What will be the output of the following PHP code?

```
    <?php
```

        define("GREETING1","Hello you! How are you today?");

        define("GREETING2","Hello you! How are you today?");

        define("GREETING3","Hello you! How are you today?");

```
        echo defined("GREETING");
```
```
     ?>
```

a) 1
b) 0
c) 3
d) 4
View Answer

Answer: b
Explanation: The defined() function checks whether a constant exists.

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