PHP dynamic typing behavior - Mini Project: Build & Apply

PHP Dynamic Typing Behavior

📖 Scenario: Imagine you are working with PHP, a language that changes the type of a variable automatically based on what you assign to it. This is called dynamic typing. You want to see how PHP changes variable types when you assign different values.

🎯 Goal: You will create a PHP script that shows how a variable's type changes when you assign different kinds of values to it. You will print the variable's value and its type after each assignment.

📋 What You'll Learn

Create a variable called $var and assign it an integer value.

Create a variable called $types to store the types of $var after each assignment.

Assign different types of values to $var: integer, string, float, boolean, and array.

Print the value and type of $var after each assignment.

💡 Why This Matters

🌍 Real World

Understanding dynamic typing helps when working with PHP code that changes variable types, such as user input or data from databases.

💼 Career

Many PHP jobs require debugging and writing code that handles different data types safely and correctly.

1

Create a variable with an integer value

Create a variable called $var and assign it the integer value 10.

PHP

<?php

// Create a variable called $var and assign it the integer value 10
// Your code here

Need a hint?

Use the assignment operator = to set $var to 10.

2

Create a variable to store types

Create an empty array called $types to store the types of $var after each assignment.

PHP

<?php

$var = 10;

// Create an empty array called $types
// Your code here

Need a hint?

Use square brackets [] to create an empty array in PHP.

3

Assign different types and store their types

Assign these values to $var one by one: 10 (integer), "hello" (string), 3.14 (float), true (boolean), and [1, 2, 3] (array). After each assignment, add the type of $var to the $types array using gettype($var).

PHP

<?php

$var = 10;
$types = [];

// Assign 10 to $var and add its type to $types
// Assign "hello" to $var and add its type to $types
// Assign 3.14 to $var and add its type to $types
// Assign true to $var and add its type to $types
// Assign [1, 2, 3] to $var and add its type to $types
// Your code here

Need a hint?

Use $types[] = gettype($var); to add the current type of $var to the array.

4

Print the value and type of $var after each assignment

Use a foreach loop with variables $index and $type to iterate over $types. Inside the loop, print the assignment number (starting from 1) and the type stored in $type using echo. The output should look like:
Assignment 1: integer
Assignment 2: string
and so on.

PHP

<?php

$var = 10;
$types = [];

$var = 10;
$types[] = gettype($var);

$var = "hello";
$types[] = gettype($var);

$var = 3.14;
$types[] = gettype($var);

$var = true;
$types[] = gettype($var);

$var = [1, 2, 3];
$types[] = gettype($var);

// Use foreach loop to print assignment number and type
// Your code here

Need a hint?

Remember that array indexes start at 0, so add 1 to $index when printing the assignment number.