how to define global variable in php

This article shares the differences between $globals and global in the hyper-global variables in PHP. First, super global variable $globalsThere are many PHP hyper-global variables, such as the following are the Hyper global Variables (superglobal):

Php global variables, which are defined by php global variables. Php global variables, php global variables define PHP global variables PHP pre-defines several Super global variables (superglobals), which means that they can use php global variables

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

#一, PHP variable definition: Variables are used to store values, such as numbers, text strings or arrays, V: string/integer/double/array/object Naming rules: 1. The variable name of PHP is case-sensitive. 2. The variable name must begin with $3,

Answer the question in the previous section first. 01 02 $foo= 10; 03 $bar= 20; 04   05

The difference between global variables $ GLOBALS and global in PHP. This article shares the differences between Super global variables $ GLOBALS and global in PHP. 1. there are many Super global variables $ GLOBALSPHP, and the following are all

Php pre-defined variable help (with instance ). From php4.1.0, the preferred method for getting external variables is to use the Superglobal variables mentioned below. Prior to this, people were either dependent on register_globals, or long

The preferred method for php to obtain external variables is to use the hyperglobal variables mentioned below. Prior to this, people were either dependent on register_globals or long pre-defined PHP array ($ HTTP _ * _ VARS ). From PHP5.0.0, PHP

The global variables in PHP are a little different from those in C language. In C language, global variables take effect automatically in the function unless they are overwritten by local variables, which may cause some problems, some may carelessly

This can cause some problems, and some people may inadvertently change a global variable. Global variables in PHP must be declared as global when used in functions (note that the Global keyword is defined in the function to be useful). The role of 1: