Type coercion in operations in PHP - Mini Project: Build & Apply

Type coercion in operations

📖 Scenario: Imagine you are working with a small PHP script that handles simple math operations. Sometimes, the numbers come as strings, and PHP needs to convert them automatically to do the math correctly. This is called type coercion.

🎯 Goal: You will create variables with string and integer values, then perform addition to see how PHP changes types automatically. Finally, you will print the result to understand how type coercion works in PHP.

📋 What You'll Learn

Create variables with string and integer values

Add these variables together to see type coercion

Print the result to show the final value

💡 Why This Matters

🌍 Real World

When working with user input or data from files, numbers may come as strings. Understanding how PHP converts types helps avoid bugs in calculations.

💼 Career

Many PHP jobs require handling mixed data types safely. Knowing type coercion helps write reliable code that works with different input formats.

1

Create variables with string and integer values

Create a variable called $numString and set it to the string "10". Then create a variable called $numInt and set it to the integer 5.

PHP

# Create variables $numString and $numInt with values "10" and 5
# Your code here

Need a hint?

Remember to use double quotes for the string "10" and no quotes for the integer 5.

2

Add the variables to see type coercion

Create a variable called $sum and set it to the result of adding $numString and $numInt.

PHP

<?php
$numString = "10";
$numInt = 5;

# Add $numString and $numInt and store in $sum
# Your code here

Need a hint?

Use the plus sign + to add the two variables.

3

Print the result to see the output

Use echo to print the value of $sum.

PHP

<?php
$numString = "10";
$numInt = 5;
$sum = $numString + $numInt;

# Print the value of $sum
# Your code here

Need a hint?

Use echo $sum; to show the result.

4

Add a string that is not a number and print the result

Create a variable called $text and set it to the string "abc". Then create a variable called $result and set it to the sum of $numString and $text. Finally, use echo to print $result.

PHP

<?php
$numString = "10";
$numInt = 5;
$sum = $numString + $numInt;
echo $sum;

# Create $text with "abc" and add to $numString, store in $result
# Print $result
# Your code here

Need a hint?

Adding a number string and a non-number string results in PHP converting the non-number string to 0.