Echo vs print behavior in PHP - Quick Revision & Key Differences

Recall & Review

beginner

What is the main difference between echo and print in PHP?

echo can output one or more strings and does not return a value, while print can only output one string and returns 1, so it can be used in expressions.

beginner

Can echo output multiple strings separated by commas?

Yes, echo can output multiple strings separated by commas like echo 'Hello', ' ', 'World';. print cannot do this.

intermediate

Does print return a value? What is it used for?

print returns 1, which means it can be used in expressions or conditional statements, unlike echo which returns nothing.

intermediate

Which one is slightly faster: echo or print?

echo is slightly faster because it does not return a value and can output multiple strings at once.

beginner

Can echo be used with parentheses like a function?

Yes, echo can be used with parentheses like echo('Hello');, but it is not a real function, just a language construct.

Which of these statements about echo and print in PHP is TRUE?

A <code>echo</code> can output multiple strings separated by commas.

B <code>print</code> can output multiple strings separated by commas.

C <code>echo</code> returns 1 after outputting.

D <code>print</code> cannot be used in expressions.

echo can output multiple strings separated by commas, but print cannot. print returns 1 and can be used in expressions.

What does print return after outputting a string?

A The string itself

B The length of the string

C Nothing (void)

D 1

print returns 1, which allows it to be used in expressions.

Which is faster in PHP?

A <code>echo</code>

B <code>print</code>

C Both are equally fast

D Depends on the string length

echo is slightly faster because it does not return a value and can output multiple strings.

Can echo be used with parentheses like a function?

A No, it is a keyword and cannot use parentheses.

B Yes, but it is not a real function.

C Only in PHP 8 and above.

D Only when outputting variables.

echo can be used with parentheses but it is a language construct, not a real function.

Which statement is true about print?

A It can output multiple strings separated by commas.

B It returns no value.

C It can be used in conditional expressions.

D It is faster than <code>echo</code>.

print returns 1, so it can be used in conditional expressions.

Explain the differences between echo and print in PHP.

Think about output capability, return values, and speed.

When would you choose print over echo in PHP?

Consider the return value and expression usage.

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