10 articles about the range of variables recommended

What is a global variable? A global variable, also known as an external variable, is defined outside the function and is scoped to the end of the program file, starting at the definition of the variable. Unlike other programming languages, global variables are not automatically set to be available. In the previous section we introduced the local variables of the scope of the PHP variable, in PHP, because the function can be treated as a separate program snippet, so the local variable overrides the visibility of the global variable, so the global variable cannot be called directly in the function. The format of its code is as follows: <?php $one = 10; $two = 20; The test cannot use the global variable directly inside the function $one and $two function sum () {//A new declaration within the function and no two variables assigned the initial value 1. What is a global variable? The PHP variable's fan

1. A detailed introduction to PHP variables

Summary: What are global variables? A global variable, also known as an external variable, is defined outside the function and is scoped to the end of the program file, starting at the definition of the variable. Unlike other programming languages, global variables are not automatically set to be available. In the previous section we introduced the local variables of the scope of the PHP variable, in PHP, because the function can be treated as a separate program snippet, so the local variable overrides the visibility of the global variable, so the global variable cannot be called directly in the function. The format of its code is as follows: &lt;? php&nbsp; $one ...

2. What are global variables? Examples of global variables for the range of PHP variables

Summary: A global variable, also known as an external variable, is defined outside the function and is scoped to the end of the program file, starting at the definition of the variable.

3. What is a local variable? Example of a local variable in the scope of a PHP variable

Summary: The scope of a variable is also its scope of entry. Most PHP variables have only a single scope of use, and also include the files introduced by include and require.

4. PHP Variable Range

Summary: The scope of a variable is the context in which it is defined (that is, its effective scope). Most PHP variables have a single range. This separate scope span also contains the files introduced by include and require

5. Use and differences in PHP for Global and $globals[]

Summary: The scope of a variable is the context in which it is defined (that is, its effective scope). Most PHP variables have a single range. This separate scope span also contains the files introduced by include and require. For example: &lt;? PHP $a = 1; Include ' B.inc ';?&gt; Here the variable $a will take effect in the include file B.inc. However, in a user-defined function, a local function scope is introduced. Any use of ...

6. PHP variable scope (1/3) _php Tutorial

Introduction: PHP Variable scope detailed (1/3). The scope of a variable is the context in which it is defined (that is, the scope it takes effect). Most PHP variables have a single range. This separate span also contains the incl

7. On PHP variable scope and address reference problem _php tutorial

Introduction: On the scope of PHP variables and address reference problems. Scope Concept: Variables can be declared anywhere in a PHP script, but declaring a variable's position greatly affects the scope of the access variable. This accessible range is called scope

8. Global Variables in PHP _php tutorial

Summary: Global variables in PHP are detailed. This article provides a detailed introduction to the global variables in PHP, and there are a few friends who need to know how to use the Globals function to refer to this article. The scope of the variable is the context background that it defines

9. PHP variable scope, reference, object reference, pass _php tutorial

Description: PHP variable scope, reference, object reference, pass. This article describes the scope of PHP variables, references, object references, delivery, there is a need for friends to refer to. The scope of a variable range variable is the context in which it is defined (that is, its

10. Stupid Bird Learn php (v) function declaration and use _php tutorial

Introduction: Stupid Bird Learn php (v) function declaration and use. Stupid Bird Learn php (v) function declaration and use 1, function declaration 2, variable scope local variable: The variable declared in the function is a local variable, can only be used within its own function