What is the variable in php

This article introduces the relevant knowledge of "what are variables in php". In the operation of actual cases, many people will encounter such a dilemma. Then 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!

Variables in php are "containers" for storing information, and similar to algebra, PHP variables can be assigned a value (xchang5) or an expression (z=x+y); variables can be short names (such as x and y) or more descriptive names (such as age, carname, totalvolume).

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

What does a variable mean in php?

Variables in php are containers for storing information.

Similar to algebra, a PHP variable can be assigned a value (XForm5) or an expression (z=x+y).

Variables can be short names, such as x and y, or more descriptive names, such as age, carname, totalvolume.

PHP variable rules:

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 lamp PHP statements and PHP variables are case-sensitive.

Create (declare) PHP variable

PHP does not have a command to declare variables.

The variable is created the first time you assign it:

Example

In the above statement execution, the variable txt will hold the value Hello worldview, and the variable x will hold the value 5.

Note: when you assign a text value to a variable, put quotation marks around the text value.

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