PHP tags and embedding in HTML - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are the standard PHP tags used to embed PHP code in an HTML file?

The standard PHP tags are <?php ... ?>. They tell the server to start and end PHP code inside an HTML file.

beginner

Can you use short PHP tags like <? ... ?> to embed PHP code?

Short tags <? ... ?> can be used but are not always enabled by default and are discouraged for portability. It's safer to use full tags <?php ... ?>.

beginner

How do you embed a simple PHP echo statement inside HTML?

You can embed PHP inside HTML like this:

<html>
  <body>
    <?php echo "Hello!"; ?>
  </body>
</html>

This will print "Hello!" on the page.

beginner

What is the purpose of the <?= ... ?> tag in PHP?

The <?= ... ?> tag is a shortcut for <?php echo ... ?>. It quickly outputs the value of an expression.

beginner

Why do we embed PHP code inside HTML files?

Embedding PHP inside HTML lets you create dynamic web pages. PHP runs on the server and can generate HTML content based on logic, user input, or data.

Which PHP tag is the standard and safest to use for embedding PHP code?

A <script> ... </script>

B <? ... ?>

C <?php ... ?>

D <% ... %>

The standard PHP tag is <?php ... ?>. It is always supported and recommended.

What does the PHP tag <?= ... ?> do?

A Starts a PHP comment

B Ends PHP code

C Defines a PHP function

D Outputs the value of an expression

The <?= ... ?> tag is a shortcut for echoing the value of an expression.

Is it possible to mix PHP code and HTML in the same file?

A Yes, PHP can be embedded inside HTML using PHP tags

B No, PHP and HTML must be in separate files

C Only if you use JavaScript

D Only if you use CSS

PHP code can be embedded inside HTML files using PHP tags to create dynamic content.

What happens if you use short PHP tags <? ... ?> on a server where they are disabled?

A The PHP code runs normally

B The code is treated as plain text and shown on the page

C The server crashes

D The code is automatically converted to full tags

If short tags are disabled, the code inside <? ... ?> is not processed and appears as text.

Why do we embed PHP code inside HTML files?

A To create dynamic web pages that can change content

B To make static web pages

C To style the page with colors

D To add images

Embedding PHP allows the server to generate dynamic content based on logic or data.

Explain how PHP tags are used to embed PHP code inside an HTML file.

Think about how PHP code is marked inside HTML.

Describe the difference between standard PHP tags and short PHP tags.

Consider compatibility and server settings.

Practice

1. Which of the following is the correct way to start a PHP code block inside an HTML file?

easy

A. <?php>

B. <?php

C. <php?

D. <?php/>

Solution

1. Step 1: Recognize PHP opening tag syntax

   The correct PHP opening tag is <?php without the closing > inside the tag itself.

2. Step 2: Compare options with correct syntax

   <?php matches the correct opening tag exactly, while others have extra characters or wrong order.

3. Final Answer:

   <?php -> Option B

4. Quick Check:

   PHP code starts with <?php [OK]

Hint: PHP code always starts with <?php [OK]

Common Mistakes:

• Using <php? instead of <?php
• Adding extra > inside the opening tag
• Confusing closing tag with opening tag

2. Which of these is the correct way to embed PHP code inside an HTML file?

easy

A. <?php echo 'Hello'; ?>

B. <php echo 'Hello'; ?>

C. <? echo 'Hello'; ?>

D. <?php echo 'Hello' ?>

Solution

1. Step 1: Identify correct PHP tags and syntax

   The full PHP opening tag is <?php and must be closed with ?>. The statement ends with a semicolon.

2. Step 2: Check each option for syntax correctness

   <?php echo 'Hello'; ?> uses <?php and closes with ?> and has a semicolon after echo statement, which is correct.

3. Final Answer:

   <?php echo 'Hello'; ?> -> Option A

4. Quick Check:

   Full PHP tags with semicolon = correct syntax [OK]

Hint: Use full <?php ... ?> tags with semicolon [OK]

Common Mistakes:

• Omitting semicolon after PHP statements
• Using <php instead of <?php
• Using short tags <? without php (may be disabled)

3. What will be the output of this code snippet embedded in an HTML file?

<html>
<body>
<?php
  echo "Today is ".date('l').".";
?>
</body>
</html>

medium

A. Today is Monday.

B. Today is l.

C. Today is date('l').

D. Syntax error

Solution

1. Step 1: Understand PHP date function usage

   The date('l') function returns the full name of the current day of the week, e.g., Monday, Tuesday.

2. Step 2: Analyze echo statement output

   The echo concatenates "Today is " with the day name and a period, so output will be like "Today is Monday." depending on the current day.

3. Final Answer:

   Today is Monday. -> Option A

4. Quick Check:

   date('l') returns day name, so output is Today is Monday. [OK]

Hint: date('l') returns day name, output shows full sentence [OK]

Common Mistakes:

• Treating date('l') as a string literal
• Missing concatenation operator
• Expecting syntax error from correct code

4. Identify the error in this PHP embedded in HTML code:

<html>
<body>
<?php
  echo "Hello World"
?>
</body>
</html>

medium

A. Echo statement syntax error

B. Incorrect PHP opening tag

C. Missing semicolon after echo statement

D. Missing closing PHP tag

Solution

1. Step 1: Check PHP statement syntax

   The echo statement must end with a semicolon ; to separate statements.

2. Step 2: Verify PHP tags and code completeness

   The opening tag <?php and closing tag ?> are correct and present.

3. Final Answer:

   Missing semicolon after echo statement -> Option C

4. Quick Check:

   Statements need semicolon; missing here causes error [OK]

Hint: Always end PHP statements with semicolon [OK]

Common Mistakes:

• Forgetting semicolon after echo
• Confusing short tags with full tags
• Assuming closing tag is optional

5. You want to embed PHP in HTML to display a greeting that changes based on the time of day. Which code snippet correctly uses PHP tags and logic inside HTML?

hard

A. <?php echo if (date('H') < 12) { 'Good morning!'; } else { 'Good afternoon!'; } ?>

B. <? if (date('H') < 12) echo 'Good morning!'; else echo 'Good afternoon!'; ?>

C. <php if (date('H') < 12) { echo 'Good morning!'; } else { echo 'Good afternoon!'; } ?>

D. <?php if (date('H') < 12) { echo 'Good morning!'; } else { echo 'Good afternoon!'; } ?>

Solution

1. Step 1: Check PHP opening and closing tags

   <?php if (date('H') < 12) { echo 'Good morning!'; } else { echo 'Good afternoon!'; } ?> uses full <?php ... ?> tags correctly. <? if (date('H') < 12) echo 'Good morning!'; else echo 'Good afternoon!'; ?> uses short tags which may be disabled. <php if (date('H') < 12) { echo 'Good morning!'; } else { echo 'Good afternoon!'; } ?> uses <php which is invalid. <?php echo if (date('H') < 12) { 'Good morning!'; } else { 'Good afternoon!'; } ?> misuses echo with if statement.

2. Step 2: Verify PHP syntax and logic

   <?php if (date('H') < 12) { echo 'Good morning!'; } else { echo 'Good afternoon!'; } ?> correctly uses if-else with echo inside braces. <?php echo if (date('H') < 12) { 'Good morning!'; } else { 'Good afternoon!'; } ?> tries to echo an if statement directly, which is invalid syntax.

3. Final Answer:

   <?php if (date('H') < 12) { echo 'Good morning!'; } else { echo 'Good afternoon!'; } ?> -> Option D

4. Quick Check:

   Full PHP tags + proper if-else syntax = correct [OK]

Hint: Use full <?php tags and proper if-else syntax [OK]

Common Mistakes:

• Using short tags <? which may be disabled
• Incorrect PHP opening tag like <php
• Trying to echo an if statement directly