Accessing global variables in PHP within a function?

Question

 

I'm writing a function in PHP , but I try to use certain variables and seems to not exist. Are variables that I created outside the function and I would like to use within the function , but without passing them as a parameter.

 Answer by Miguel Angel Alvarez In PHP, within a function, in principle, there are only variables you have created within it. Thus , it is normal that you can not access variables created outside there that function.

 

 

 

 

In PHP , variables declared externally to a function are global and created in a function are local variables. However, PHP provides us with a couple of mechanisms for within functions can use global variables. The ? Global? Array $ GLOBALS and the declaration of global variables ? at the beginning of the function.

 

 

 

 

All the field variables and the use of global variables inside a function are explained in our manual PHP.

Answer 1

You only need to declare the variable as global within the function example 

 

<? 

variable $ = "whatever"; 

function A () 

{

Global variable $;/ / here you tell php to look for the variable $ Variable globlar 

$ variable = "value change" ;/ / Here change the value of the global variable $ value 

} 

function B () 

{

variable $ = "hello" ;/ / this is a variable local to the function B, if not modified modified global variable. 

} 

 

>

Answer 2

That's one way to solve the problem, another method is needed to pass the variables as parameters of the function when the same call. 

 

Sample function call: 

nombredefuncio ($ variable1, $ variable2, $ variable) 

 

You can pass any number of varying only thing is that when you develop the function should ask you the same amount of variables that you send. 

 

Example development function: 

 

nombredefuncio function ($ variable1, $ variable2, $ variable) 

{

.... 

}

Answer 3

wave have the same question, there's something I do not understand: I use the following code on the screen but nothing is displayed ... just goes Parse error, then I put the (instruction;) and I do not get error but not displayed screen. 

in the php manual example shows that sin (;) copy it and paste it in my notepad + + store in www is the folder where I keep my pages using wamp server ... 

 

 

 

<? php 

 

$ myvar = "foo"; 

otravariable = $ 1234; 

function myfunction () {

global $ myvar, $ otravariable / / with this line inside the function, declare the use of global variables 

echo $ myvar; 

echo $ otravariable; 

} 

 

> 

 

 

 

<? php 

 

$ myvar = "foo"; 

otravariable = $ 1234; 

function myfunction () {

global $ myvar, $ otravariable;/ / with this line inside the function, declare the use of global variables 

echo $ myvar; 

echo $ otravariable; 

} 

 

>