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This article mainly introduces the incorrect name of the PHP variable how to express, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

The incorrect PHP variable name is "$9thizBeijing" because the PHP variable name must start with a letter or an underscore character, and the PHP variable name is case-sensitive.

This article operating environment: Windows7 system, PHP7.1, Dell G3 computer.

The incorrect PHP variable name is $9thizBeijing.

This requires familiarity with the rules of PHP variables.

The rules for PHP variables are as follows:

The variable begins with the $symbol, followed by the name of the variable

Variable names must start with a letter or an underscore character

Variable names can only contain letters, numbers, and underscores (Amurz, 0-9, and _)

Variable names cannot contain spaces

Variable names are case-sensitive ($y and $Y are two different variables)

Both PHP statements and PHP variables are case-sensitive.

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