Naming rules for PHP variables

This article mainly explains the naming rules of PHP variables. the content of the explanation is simple and clear, and it is easy to learn and understand. please follow the editor's train of thought to study and learn the naming rules of PHP variables.

Let's start with the naming rules for php variables:

(1) variable names of PHP are case sensitive

(2) the variable name must start with the dollar sign $

(3) the variable name can begin with an underscore.

(4) variable names cannot start with numeric characters.

In fact, a similar naming convention for all programming is:

1. The first character of a variable is preferably a letter or _, and cannot start with a number

two。 The second character begins to allow numbers, letters, _

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