As an experienced developer, let me know you, PHP Numbers are a very important concept that must know who want to become a backend or full stack developer. There are 3 numeric types of Numbers in PHP. Let’s see which they are.
Numeric Types in PHP Numbers
- Integer
An integer is a number without any decimal part. For example, 2, 20, 200, and 2000 are Integer numbers because they don’t have a decimal point in a number. - Float
A float is a number with a decimal part. For example, 2.0, 2.0, 20.0, and 200.0 are Float numbers because they have a decimal point in a number. - Number String
A numeric string is a string that contains numbers. PHP can automatically convert numeric strings to actual numbers when performing arithmetic operations. Example: $numString = “1989”;
Beginner-Level MCQ Questions on PHP Numbers
Which of the following is a valid integer in PHP?
A. 42
B. 42.5
C. “42”
D. 0x42
Correct Answer: A – 42
What function is used to round a float to the nearest integer in PHP?
A. ceil()
B. floor()
C. round()
D. truncate()
Correct Answer: C – round()
What is the output of ceil(4.3) in PHP?
A. 4
B. 5
C. 4.3
D. 4.5
Correct Answer A – 4
Which function returns the absolute value of a number in PHP?
A. abs()
B. fabs()
C. absolute()
D. mag()
Correct Answer A – abs()
Intermediate Level MCQ Questions on PHP Numbers
What will be the output of echo (int)3.9; in PHP?
A. 3
B. 4
C. 3.9
D. Error
Correct Answer A – 3
How would you generate a random integer between 1 and 100 in PHP?
A. random(1, 100)
B. rand(1, 100)
C. random_int(1, 100)
D. mt_rand(1, 100)
Correct Answer B – rand(1, 100)
What will be the result of pow(2, 3) in PHP?
A. 6
B. 8
C. 9
D. 16
Correct Answer B – 8
Advanced Level MCQ Questions on PHP Numbers
How can you calculate the natural logarithm of a number in PHP?
A. log10()
B. log()
C. ln()
D. exp()
Correct Answer B – log()
Which PHP function will return the remainder of a division?
A. mod()
B. remainder()
C. div()
D. %
Correct Answer D – %
What is the output of round(7.25, 1) in PHP?
A. 7
B. 7.3
C. 7.2
D. 7.25
Correct Answer B – 7.3
How do you find the base-10 logarithm of a number in PHP?
A. log10()
B. log()
C. logb()
D. logten()
Correct Answer A – log10()
What will be the output of intval(42.8) in PHP?
A. 42
B. 43
C. 42.8
D. Error
Correct Answer A – 42
Logical MCQ Questions on PHP Numbers
What will be the output of the following code?
<?php
$a = 10;
$b = 3;
echo $a % $b;
?>A. 1
B. 2
C. 3
D. 0
Correct Answer B – 2
Given the following code, what will be the output?
<?php
$x = 7;
$y = $x++ + ++$x;
echo $y;
?>A. 14
B. 15
C. 16
D. 13
Correct Answer C – 16
What will the following code snippet output?
<?php
$a = 5;
$b = 10;
$c = $a ** $b;
echo $c;
?>A. 500
B. 1000
C. 9765625
D. 50
Correct Answer C – 9765625
13+ Excellence MCQ on Data Types in PHP
What will the following code output?
<?php
$a = 15;
$b = 4;
$result = ($a / $b) * $b;
echo (int)$result;
?>A. 12
B. 15
C. 16
D. 14
Correct Answer B – 15
Let me explain to you why the answer is 15.
$a is set to 15.
$b is set to 4.
First, the division $a / $b is evaluated: $a / $b = 15 / 4 = 3.75; value of $b is 4.
Next, multiply this result by $b. ($a / $b) * $b 3.75 * 4 = 15.0;
Type Casting to Integer:
The result of the multiplication is 15.0.
Casting 15.0 to an integer using (int) results in 15.
What will the following code output?
<?php
$number = -3.75;
echo ceil($number);
?>A. -4
B. -3
C. 3
D. 4
Correct Answer B – -3
Step-by-Step Explanation
Initial Value:
$number is set to -3.75.
Using ceil() Function: The ceil() function in PHP rounds a number up to the nearest integer.
For negative numbers, “up” means towards zero. Therefore, ceil(-3.75) will round to the nearest integer greater than or equal to -3.75, which is -3.
Given the code below, what will be the output?
<?php
$a = 2;
$b = 3;
$c = 4;
$result = $a * $b ** $c;
echo $result;
?>A. 128
B. 162
C. 512
D. 1024
Correct Answer B – 162
Explanation:
The exponentiation operation has higher precedence than multiplication.
First, evaluate $b ** $c
$b ** $c = 3 ** 4 = 3 * 3 * 3 * 3 = 81;
Next, multiply the result by $a
$a * 81 = 2 * 81 = 162;
What will the following code snippet output?
<?php
$a = 10;
$b = "10 apples";
$sum = $a + $b;
echo $sum;
?>A. 10
B. 20
C. 10 apples
D. Error
Correct Answer B – 20
Explanation: Type Conversion in PHP
PHP will attempt to convert strings to numbers when performing arithmetic operations. If a string starts with a numeric value, PHP will use that numeric value and ignore the rest of the string.
Initial Values:
$a is set to 10.
$b is set to “10 apples”.
String to Number Conversion:
When adding $a and $b, PHP will convert the string “10 apples” to the integer 10.
Arithmetic Operation:
The addition operation will be performed:
$sum = 10 + 10;
The result of the addition is 20.
What will be the output of this code?
<?php
$value = 16;
echo sqrt($value);
?>A. 4
B. 8
C. 16
D. 2
Correct Answer A – 4
Explanation: sqrt means Square Root. Square Root of 16 is 4.
What will the following code output?
<?php
$x = 5.5;
$y = 2.1;
$result = round($x + $y);
echo $result;
?>A. 7
B. 7.6
C. 8
D. 6
Correct Answer C – 8
Explanation: $x = 5.5 and $y = 2.1 $x + $y means 5.5 + 2.1 = 7.6
Round (7.6), round() function to round the result to the nearest integer. round(7.6) = 8;
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