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What are rules for naming a PHP variable?

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What are rules for naming a PHP variable?

Rules for PHP variables: 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 the rules you should keep in mind when creating a PHP variable?

Rules for declaring PHP variable:

  • A variable must start with a dollar ($) sign, followed by the variable name.
  • It can only contain alpha-numeric character and underscore (A-z, 0-9, _).
  • A variable name must start with a letter or underscore (_) character.
  • A PHP variable name cannot contain spaces.

How PHP variables are used explain with examples?

Variables are used to store data, like string of text, numbers, etc. Variable values can change over the course of a script. PHP automatically converts the variable to the correct data type, depending on its value. After declaring a variable it can be reused throughout the code.

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Is PHP snake case or camelCase?

Internally, PHP itself uses Underscores for variables and functions, camelCase for Methods, and PascalCase for Classes, as stated in this PHP documentation page (userlandnaming.

How many data types are there in PHP?

PHP has four scalar types, four compound types, and two special types. Scale types: integer, float, string, and boolean.

How do I start PHP programming?

In order to start PHP, MySQL, PHPMyAdmin and Apache in a single attempt, XAMPP should be installed. Scroll over to XAMPP for Windows and download should begin shortly. Click the .exe file to start the installation procedure. Select the components which you want to install and click “Next”.

What are operators in PHP?

An operator is a symbol that performs operations on operands. In PHP (Hypertext Preprocessor), there are different types of operators depending on the number of operands they take. For example, urinary operators take only one operand. On the contrary, binary operators take two operands.

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What are functions in PHP?

A Function in PHP is a reusable piece or block of code that performs a specific action. It takes input from the user in the form of parameters, performs certain actions, and gives the output. Functions can either return values when called or can simply perform an operation without returning any value.

What is PSR coding?

The PHP Standard Recommendation (PSR) is a PHP specification published by the PHP Framework Interop Group. It comprises what should be considered the standard coding elements that are required to ensure a high level of technical interoperability between shared PHP code.

What is PSR in programming?

The PHP Standard Recommendation (PSR) is a PHP specification published by the PHP Framework Interoperability Group (PHP-FIG). It serves the standardization of programming concepts in PHP. The aim is to enable interoperability of components. The PHP-FIG is formed by several PHP frameworks founders.

What are the rules for variable names in PHP?

Rules for PHP variables Variable declarations starts with $, followed by the name of the variable Variable names can only start with an upper or lowercase letter or an underscore (_) Variable names can only contain letters, numbers, or underscores (A-z, 0-9, and _).

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What are the syntax rules for writing PHP code?

Below we have a listed down the main syntax rules that you must follow while writing php code. All the php code in a php script should be enclosed within , else it will not be considered as php code. Adding php code inside the PHP tags is known as Escaping to php.

What is a strict requirement in PHP 7?

In PHP 7, type declarations were added. This gives an option to specify the data type expected when declaring a function, and by enabling the strict requirement, it will throw a “Fatal Error” on a type mismatch. You will learn more about strict and non-strict requirements, and data type declarations in the PHP Functions chapter.

What are the coding standards of PHP?

The definitive guide is the official » CODING STANDARDS : PHP owns the top-level namespace but tries to find decent descriptive names and avoid any obvious clashes. Function names use underscores between words, while class names use both the camelCase and PascalCase rules.