Variable declaration with dollar sign in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What symbol is used to declare a variable in PHP?

In PHP, variables are declared using the dollar sign $ before the variable name, like $variableName.

beginner

Why does PHP use a dollar sign $ before variable names?

The dollar sign $ tells PHP that what follows is a variable. It helps PHP recognize variables easily in the code.

beginner

Is this a valid PHP variable declaration? <br>$name = "Alice";

Yes, this is valid. The variable $name is declared and assigned the string value "Alice".

beginner

Can variable names in PHP start with a number? For example, is $1name valid?

No, variable names cannot start with a number. They must start with a letter or underscore after the dollar sign.

beginner

How do you declare multiple variables in PHP using the dollar sign?

You declare each variable with its own dollar sign, for example: $a = 1; $b = 2;. Each variable needs its own $.

What does the dollar sign $ mean in PHP variable declaration?

A It marks the start of a variable name

B It is used for comments

C It declares a function

D It ends a statement

The dollar sign $ tells PHP that the following word is a variable name.

Which of these is a valid PHP variable name?

A $2ndPlace

B $_score

C $-value

D $ name

Variable names must start with a letter or underscore after the dollar sign. $_score is valid.

How do you assign the number 10 to a variable named count in PHP?

A $count = 10;

B #count = 10;

C var count = 10;

D count = 10;

In PHP, variables start with $, so $count = 10; is correct.

What will this PHP code output? <br>$name = "Bob"; echo $name;

A name

B $name

C Bob

D Error

The variable $name holds "Bob", so echo prints "Bob".

Can you declare two variables like this in PHP? <br>$a = 5, $b = 10;

A Only if inside a function

B No, variables must be declared on separate lines

C No, commas are not allowed in variable declarations

D Yes, this is valid syntax

Yes, this is valid syntax. You can declare multiple variables separated by commas like $a = 5, $b = 10;.

Explain how to declare a variable in PHP and why the dollar sign is necessary.

Think about how PHP knows something is a variable.

Describe the rules for naming variables in PHP after the dollar sign.

Consider what characters are allowed at the start and inside variable names.