What is wrong with PHP variable names?

The incorrect PHP variable name is "$9thizBeijing" because PHP variable names must start with letters or underscore characters, and PHP variable names are case-sensitive.

#The operating environment of this article: Windows7 system, PHP7.1, Dell G3 computer.

What is the incorrect PHP variable name?

The incorrect PHP variable name is $9thizBeijing.

#This requires familiarity with PHP variable rules.

PHP variable rules are as follows:

• Variables start with the $ symbol, followed by the name of the variable

• The variable name must start with Start with a letter or underscore character

• Variable name can only contain letters, numbers and underscores (A-z, 0-9 and _)

• Variable name Cannot contain spaces

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

PHP statements and PHP variables are case-sensitive.

Recommended learning: "PHP Video Tutorial"

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