Heredoc and nowdoc syntax in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is heredoc syntax in PHP?

Heredoc is a way to write long strings in PHP without using quotes. It starts with <<<IDENTIFIER and ends with the same IDENTIFIER on a new line. Variables inside heredoc are replaced with their values.

beginner

How does nowdoc syntax differ from heredoc in PHP?

Nowdoc is like heredoc but treats the content as plain text. It uses single quotes around the identifier like <<<'IDENTIFIER'. Variables inside nowdoc are not replaced; they stay as text.

beginner

Show the correct way to end a heredoc or nowdoc string.

The ending identifier must be on a new line, start at the beginning (no spaces), and be followed by a semicolon. For example:<br>IDENTIFIER;

beginner

Can you use variables inside heredoc and nowdoc? Explain.

In heredoc, variables are replaced with their values, just like in double-quoted strings.<br>In nowdoc, variables are not replaced; they are treated as plain text.

beginner

Why use heredoc or nowdoc instead of regular quotes?

They make it easier to write long strings or text blocks without worrying about escaping quotes. Heredoc allows variable use, nowdoc is good for raw text.

Which syntax allows variable parsing inside the string?

A Neither heredoc nor nowdoc

B Heredoc

C Both heredoc and nowdoc

D Nowdoc

Heredoc parses variables inside the string, replacing them with their values. Nowdoc treats everything as plain text.

How do you start a nowdoc string in PHP?

A &lt;&lt;&lt;'IDENTIFIER'

B &lt;&lt;&lt;"IDENTIFIER"

C &lt;&lt;&lt;IDENTIFIER

D 'IDENTIFIER';

Nowdoc starts with <<< followed by the identifier in single quotes, like <<<'IDENTIFIER'.

What must be true about the ending identifier in heredoc/nowdoc?

A It must be enclosed in quotes

B It must be on the same line as the last string content

C It can be indented with spaces

D It must be at the start of a new line with no spaces

The ending identifier must be at the start of a new line with no spaces or tabs before it.

Which of these is a benefit of using heredoc or nowdoc?

A They allow writing multi-line strings easily

B They automatically compress strings

C They prevent any variable usage

D They require escaping all quotes

Heredoc and nowdoc let you write multi-line strings without escaping quotes.

What happens to variables inside a nowdoc string?

A They are replaced with their values

B They cause an error

C They remain as plain text

D They are converted to uppercase

Variables inside nowdoc are not parsed and stay as plain text.

Explain how heredoc syntax works in PHP and when you might use it.

Think about writing a long message with variables inside.

Describe the difference between heredoc and nowdoc syntax.

One lets variables work, the other keeps text raw.