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:

<code class="php">$name = "John Doe";</code>

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:

<code class="php">$age = 25; // 整数
$is_active = true; // 布尔值</code>

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