What symbols must be used to represent variables in php?

In PHP, variables start with a dollar sign ($) and are used to store data such as strings, integers, floating point numbers, Boolean values, arrays, and objects. Variable name rules include starting with a dollar sign, not starting with a number, and being case-sensitive.

Variables are represented as dollar signs ($) in PHP

In PHP, variables are used to store Container for data. They must start with a dollar sign ($) followed by the variable name. For example:

$name = "John Doe";

In the above example, the variable $name is used to store the string value "John Doe".

Variable Name Rules

PHP variable names follow the following rules:

• Must start with a dollar sign ($)
• Can contain letters, numbers and underscores (_)
• Cannot start with a number
• Case sensitive

Data type

PHP variables can store various data types, including:

• String
• Integer
• Floating point number
• Boolean value
• Array
• Object

The data type of a variable can be explicitly specified, or it can be automatically inferred when the value is assigned. For example:

$age = 25; // 整数
$is_active = true; // 布尔值

The above is the detailed content of What symbols must be used to represent variables in php?. For more information, please follow other related articles on the PHP Chinese website!