Echo vs print behavior in PHP - Hands-On Comparison

Echo vs print behavior

📖 Scenario: You are learning how to display text in PHP. Two common ways are using echo and print. They look similar but have small differences.

🎯 Goal: You will create a PHP script that shows how echo and print work by displaying messages and checking their return values.

📋 What You'll Learn

Create a variable with a string message

Use echo to display the message

Use print to display the message and capture its return value

Display the return value of print

💡 Why This Matters

🌍 Real World

Displaying messages and debugging output is a basic task in PHP web development.

💼 Career

Understanding how to output text and the differences between <code>echo</code> and <code>print</code> helps in writing clear and efficient PHP code.

1

Create a message variable

Create a variable called $message and set it to the string 'Hello, PHP!'.

PHP

<?php

// Create a variable called $message and set it to 'Hello, PHP!'
// Your code here

Hint

Use $message = 'Hello, PHP!'; to create the variable.

2

Display the message using echo

Use echo to display the variable $message.

PHP

<?php

$message = 'Hello, PHP!';

// Use echo to display $message
// Your code here

Hint

Write echo $message; to show the message.

3

Display the message using print and save return value

Use print to display the variable $message and save the return value in a variable called $result.

PHP

<?php

$message = 'Hello, PHP!';
echo $message;

// Use print to display $message and save return value in $result
// Your code here

Hint

Write $result = print $message; to display and save the return value.

4

Display the return value of print

Use echo to display the text 'Return value of print: ' followed by the value of $result.

PHP

<?php

$message = 'Hello, PHP!';
echo $message;
$result = print $message;

// Display 'Return value of print: ' and $result
// Your code here

Hint

Use echo "Return value of print: $result"; to show the return value.

Practice

1. Which statement correctly describes the difference between echo and print in PHP?

easy

A. print can output multiple values separated by commas, and echo returns 1.

B. print can output multiple values separated by commas, while echo outputs only one value and returns 1.

C. echo returns 1 after printing, while print does not return any value.

D. echo can output multiple values separated by commas, while print outputs only one value and returns 1.

Solution

1. Step 1: Understand echo behavior

   echo can output multiple values separated by commas but does not return any value.

2. Step 2: Understand print behavior

   print outputs only one value and returns 1, so it can be used in expressions.

3. Final Answer:

   echo can output multiple values separated by commas, while print outputs only one value and returns 1. -> Option D

4. Quick Check:

   Echo multiple values, print returns 1 [OK]

Hint: Echo can print many values, print returns 1 [OK]

Common Mistakes:

• Thinking print can output multiple values separated by commas
• Believing echo returns a value
• Confusing which one returns 1

2. Which of the following is the correct syntax to print multiple values using echo in PHP?

easy

A. echo ("Hello", " ", "World!");

B. echo "Hello", " ", "World!";

C. print "Hello", " ", "World!";

D. print ("Hello", " ", "World!");

Solution

1. Step 1: Check echo syntax for multiple values

   echo can take multiple arguments separated by commas without parentheses.

2. Step 2: Verify print syntax

   print only accepts one argument and does not support multiple comma-separated values.

3. Final Answer:

   echo "Hello", " ", "World!"; -> Option B

4. Quick Check:

   Echo multiple values with commas, no parentheses [OK]

Hint: Use echo with commas, no parentheses for multiple values [OK]

Common Mistakes:

• Using parentheses with echo and commas
• Trying to print multiple values with print
• Confusing echo and print syntax

3. What will be the output of the following PHP code?

echo print("Hello");

medium

A. Hello1

B. 1Hello

C. Hello

D. Syntax Error

Solution

1. Step 1: Evaluate inner print("Hello")

   print("Hello") outputs "Hello" and returns 1.

2. Step 2: Evaluate outer echo

   echo outputs the return value of print, which is 1.

3. Final Answer:

   Hello1 -> Option A

4. Quick Check:

   Print outputs Hello, returns 1 echoed next [OK]

Hint: Print returns 1, echo prints that after output [OK]

Common Mistakes:

• Expecting only 'Hello' output
• Thinking print returns no value
• Confusing order of output

4. Identify the error in the following PHP code:

print("Hello", "World");

medium

A. Syntax error because print cannot take multiple arguments.

B. No error; it prints HelloWorld.

C. Runtime error due to missing semicolon.

D. Print returns 1 but does not output anything.

Solution

1. Step 1: Check print argument rules

   print accepts only one argument; multiple arguments cause syntax error.

2. Step 2: Confirm error type

   Passing multiple arguments separated by commas to print is invalid syntax.

3. Final Answer:

   Syntax error because print cannot take multiple arguments. -> Option A

4. Quick Check:

   Print single argument only [OK]

Hint: Print accepts only one argument, else syntax error [OK]

Common Mistakes:

• Assuming print can take multiple arguments
• Ignoring syntax error messages
• Confusing print with echo behavior

5. You want to output the string "Result: 10" and also use the output function in an expression to check success. Which PHP statement correctly does this?

hard

A. echo "Result: ", 10;

B. echo print("Result: 10");

C. print("Result: " . 10);

D. print "Result: ", 10;

Solution

1. Step 1: Understand output and return needs

   You want to output "Result: 10" and get a return value to check success.

2. Step 2: Check which function returns a value

   print returns 1 after output, so it can be used in expressions; echo does not return a value.

3. Step 3: Verify syntax correctness

   print("Result: " . 10); concatenates string and number correctly and returns 1.

4. Final Answer:

   print("Result: " . 10); -> Option C

5. Quick Check:

   Print returns 1, echo does not [OK]

Hint: Use print to output and get return value [OK]

Common Mistakes:

• Using echo when return value is needed
• Trying to pass multiple arguments to print
• Misusing echo print combination