CODEWITHSUNDEEP
phparraysglobal-variables
Ralph
Ralph

Reputation: 578

PHP - declare a global array

I am having a problem of Undefined variable when I try to use an array inside a function. An example is the code below. How can I be able to access the array $prev inside the function hello()? I've tried searching but I don't really know how to use $GLOBALS[$varname] when the variable is an array. Thanks for any help!

<?php

$prev = [0,1,2];

function hello(){

    echo $prev[1];

}

hello();
hello();
hello();

?>

Upvotes: 2

Views: 13385

Answers (4)

Luca Jung
Luca Jung

Reputation: 1440

You can also pass the variable into the function: 

$prev = [0,1,2];

function hello(array $array){

    echo $array[1];

}

hello($prev);
hello($prev);
hello($prev);

?>

An other way is to pass the variable by reference.

function hello(&$array){

    $array[1]++;
    echo $array[1];

}

Upvotes: 8

apokryfos
apokryfos

Reputation: 40681

You could do something like:

$GLOBALS["prev"] = [0,1,2];
function hello(){    
    echo $GLOBALS['prev'][1];    
}

hello();

However consider doing something like:

 $prev = [1,2,3];
 function hello($prev) {
      echo $prev[1];
 }
 hello($prev);

As an alternative solution:

class GlobalsContainer {
     public static $prev=[1,2,3];
}

function hello() {
     echo GlobalsContainer::$prev[1];
}
hello();

Upvotes: 4

AGM Tazim
AGM Tazim

Reputation: 2217

Declare array with global keyword inside the function. See it - 

<?php

    function hello(){

        global $prev = [0,1,2];
        echo $prev[1];

    }


    ?>

Upvotes: 0

utnaf
utnaf

Reputation: 377

This is the way to use it as global. Btw there are also other ways to use it inside the hello function.

$prev = [0,1,2];

function hello(){
    global $prev;

    echo $prev[1];

}

hello();
hello();
hello();

Upvotes: 6

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