How to set variables in php

How to set variables in php: 1. Create a PHP sample file; 2. Set variables through "$ symbol variable name", code such as "$txt="Hello world!";".

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

How to set variables in php

PHP variables

Variables are "containers" used to store information:

Similar to algebra, PHP variables can be assigned a certain value (x=5) or the expression (z=x y).

Variables can have very short names (such as x and y) or more descriptive names (such as age, carname, totalvolume).

PHP variable rules:

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

The variable name must start with a letter or underscore character

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

Variable names cannot contain spaces

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

lamp PHP statements and PHP variables are case-sensitive.

Create (declare) PHP variables

PHP has no command to declare variables.

A variable is created when you first assign a value to it:

Example

In the execution of the above statement, the variable txt will hold the value Hello world!, And the variable x will hold the value 5.

Note: When you assign a text value to a variable, please add quotation marks around the text value.

Recommended learning: "PHP Video Tutorial"

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