Trim functions in PHP - Mini Project: Build & Apply

Trim functions

📖 Scenario: Imagine you are working on a website where users enter their names and comments. Sometimes, users accidentally add extra spaces before or after their input. You want to clean up these inputs to store neat data.

🎯 Goal: You will create a PHP script that uses trim functions to remove unwanted spaces from user input strings.

📋 What You'll Learn

Create a variable with a string that has extra spaces at the start and end

Create a variable to hold the characters to trim

Use PHP trim functions to clean the string

Print the cleaned strings

💡 Why This Matters

🌍 Real World

Cleaning user input is important to store consistent data and avoid errors caused by extra spaces.

💼 Career

Many jobs require handling user data carefully, and knowing how to trim strings is a basic but essential skill.

1

Create a string with extra spaces

Create a variable called $userInput and set it to the string " Hello World! " including the spaces at the start and end.

PHP

$userInput = "  Hello World!  " ;
# Your code here

Need a hint?

Remember to include the spaces inside the quotes.

2

Create a variable with characters to trim

Create a variable called $charsToTrim and set it to the string " H!" which includes a space, capital H, and exclamation mark.

PHP

<?php
$userInput = "  Hello World!  ";
$charsToTrim = " H!";
# Your code here

Need a hint?

This string tells PHP which characters to remove from the start and end.

3

Use trim functions to clean the string

Create three variables: $trimmed using trim($userInput), $trimmedChars using trim($userInput, $charsToTrim), and $leftTrimmed using ltrim($userInput).

PHP

<?php
$userInput = "  Hello World!  ";
$charsToTrim = " H!";
$trimmed = trim($userInput);
$trimmedChars = trim($userInput, $charsToTrim);
$leftTrimmed = ltrim($userInput);
# Your code here

Need a hint?

Use the PHP trim functions exactly as shown.

4

Print the cleaned strings

Print the variables $trimmed, $trimmedChars, and $leftTrimmed each on a new line using echo and "\n" for line breaks.

PHP

<?php
$userInput = "  Hello World!  ";
$charsToTrim = " H!";
$trimmed = trim($userInput);
$trimmedChars = trim($userInput, $charsToTrim);
$leftTrimmed = ltrim($userInput);
echo $trimmed . "\n";
echo $trimmedChars . "\n";
echo $leftTrimmed . "\n";
# Your code here

Need a hint?

Use echo to print each variable followed by a newline character.