What is the rule to name a variable in PHP?

A variable name must start with a letter or the underscore character. A variable name cannot start with a number. A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ ) Variable names are case-sensitive ( $age and $AGE are two different variables)

What are rules for naming a variable in PHP?

Rules for PHP variables:

  • A variable starts with the $ sign, followed by the name of the variable.
  • A variable name must start with a letter or the underscore character.
  • A variable name cannot start with a number.
  • A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )

What are rules for naming a variable?

The rules and conventions for naming your variables can be summarized as follows:

  • Variable names are case-sensitive. …
  • Subsequent characters may be letters, digits, dollar signs, or underscore characters. …
  • If the name you choose consists of only one word, spell that word in all lowercase letters.

What is variable name in PHP?

A variable in PHP is a name of memory location that holds data. In PHP, a variable is declared using $ sign followed by variable name. The main way to store information in the middle of a PHP program is by using a variable. … The value of a variable is the value of its most recent assignment.

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Can a variable name start with underscore in PHP?

Variables¶

Variable names may only contain alphanumeric characters. Underscores are not permitted.

What is the scope of variable in PHP?

In PHP, variables can be declared anywhere in the script. The scope of a variable is the part of the script where the variable can be referenced/used.

Which of the following is correct about variable naming rules *?

A – Variable names must begin with a letter or underscore character. B – A variable name can consist of numbers, letters, underscores. C – you cannot use characters like + , – , % , ( , ) .

Which variable name is not correct?

The following are examples of invalid variable names: age_ (ends with an underscore); 0st (starts with a digit); food+nonfood (contains character “+” which is not permitted)

What is variable explain with variable declaration rules?

Variable declaration refers to the part where a variable is first declared or introduced before its first use. Variable definition is the part where the variable is assigned a memory location and a value. Most of the times, variable declaration and definition are done together.

Is variable case-sensitive in PHP?

Variables in PHP are represented by a dollar sign followed by the name of the variable. The variable name is case-sensitive.

How many characters can a variable name have?

Variable names must be unique in a Dataset. Variable names are up to 64 characters long and can only contain letters, digits and nonpunctuation characters (except that a period (.) is allowed.

Which of the following is not a valid rule for naming PHP variables?

Which of the following is NOT a valid rule for naming PHP variables? Variable names can include numbers, letters or the underscore. Variable name can only start with letters or an underscore. Variable names can start with a number, letter or the underscore.

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Can PHP variables contain hyphens?

This is the main reason for not having hyphens in a variable. Reasons for using a naming convention (as opposed to allowing programmers to choose any character sequence) include the following: to reduce the effort needed to read and understand source code.

Do you need to initialize variables in PHP?

PHP does not require it, but it is a good practice to always initialize your variables. If you don’t initialize your variables with a default value, the PHP engine will do a type cast depending on how you are using the variable.