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PHP Numbers Explained

Numbers are one of the most frequently used data types in PHP. Whether you’re calculating product prices, applying discounts, processing payments, generating invoices, or displaying statistics, you’ll work with numbers.

PHP supports different numeric data types and provides many built-in mathematical functions that simplify calculations.

In this tutorial, you’ll learn how PHP handles numbers and how to use them effectively in real-world projects.

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What are Numbers in PHP?

PHP mainly supports two numeric types:

• Integer (int) – Whole numbers
• Float (double) – Decimal numbers

Examples:

<?php

$age = 28;
$price = 999.99;

echo $age;
echo "<br>";
echo $price;

?>

Output

28
999.99

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Integer Numbers

Integers are whole numbers without decimal points.

Example:

<?php

$students = 250;

echo $students;

?>

Examples of integers:

• 10
• 100
• -45
• 5000

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Floating Point Numbers

A float (or double) contains decimal values.

Example:

<?php

$discount = 12.5;

echo $discount;

?>

Output

12.5

Floats are commonly used for:

• Product prices
• GST calculations
• Percentages
• Ratings
• Currency values

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Checking Number Types

PHP provides built-in functions to identify numeric types.

is_int()

<?php

$number = 50;

var_dump(is_int($number));

?>

Output

bool(true)

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is_float()

<?php

$value = 99.95;

var_dump(is_float($value));

?>

Output

bool(true)

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is_numeric()

Checks whether a value is numeric.

<?php

$value = "150";

var_dump(is_numeric($value));

?>

Output

bool(true)

This function is useful when validating user input from forms.

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Basic Mathematical Operations

PHP supports all common mathematical operators.

<?php

$a = 20;
$b = 5;

echo $a + $b;
echo "<br>";

echo $a - $b;
echo "<br>";

echo $a * $b;
echo "<br>";

echo $a / $b;

?>

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Common Math Functions

Absolute Value

echo abs(-100);

Output:

100

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Square Root

echo sqrt(64);

Output:

8

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Random Number

echo rand(1,100);

Generates a random number between 1 and 100.

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Maximum Number

echo max(10,55,90,12);

Output

90

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Minimum Number

echo min(10,55,90,12);

Output

10

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Real-World Example

Calculating a product discount.

<?php

$price = 1500;
$discount = 20;

$finalPrice = $price - ($price * $discount / 100);

echo "Final Price: ₹" . $finalPrice;

?>

Output

Final Price: ₹1200

This type of calculation is widely used in e-commerce websites, billing software, and online shopping carts.

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Why Learn PHP Numbers?

Understanding numbers is essential because almost every web application performs calculations, including:

• Shopping websites
• Inventory systems
• Payroll software
• Banking applications
• Analytics dashboards
• Invoice generators
• CRM systems

Mastering numeric operations will help you build reliable and efficient PHP applications.