Shulou(Shulou.com)06/02 Report--

This article introduces the relevant knowledge of "the types and naming rules of variables in PHP". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Command rule

The variable must start with the $sign, followed by the name of the variable, and $is not part of the variable name.

The variable name must begin with a letter or an underscore.

Variable names cannot start with a number.

Variable names can only contain letters (Abeliz), numbers (0,9), and underscores (_).

Unlike other languages, some keywords in PHP can also be used as variable names (for example, $true, $for).

Variable names in PHP are case-sensitive, so $var and $Var represent two different variables.

PHP is a weakly typed language. There is no need to specify a variable type when creating a variable. PHP automatically sets it to the corresponding data type according to the value of the variable. We can create variables with the assignment character "="

Eg:

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