PHP define global variables for functions? - php

Question

I want to create an array which is in my function.php code definded so I do not have to transfer the array through my hole code. But it won't work...
This is an example of my function.php:
<?php
define("titleArray", array());
function foo(){
echo $this->titleArray;
}
function boo(){
array_push($this->titleArray, "Hello");
}
But it doesn't work... How can I fix that so that every function has access to the array?
Greetings

Answer 1

I suggest that you store your array globally using the $GLOBALS, and instead of using echo to print an array, use the print_r method instead.
<?php
$GLOBALS["titleArray"] = array('world');
function foo(){
print_r($GLOBALS["titleArray"]);
}
function boo(){
array_push($GLOBALS["titleArray"], "Hello");
print_r($GLOBALS["titleArray"]);
}
foo();
boo();

Answer 2

just remove $this
<?php
define("titleArray", array());
function foo(){
echo titleArray;
}
function boo(){
array_push(titleArray, "Hello");
}
note that array values are allowed after php 7.0 version

Answer 3

Generally we use define to make constant value which never updates, use class instead
<?php
class abc {
$titleArray = [];
function foo(){
echo $this->titleArray;
}
function boo(){
array_push($this->titleArray, "Hello");
}
}
The define() function defines a constant. Constants are much like variables, except for the following differences: A constant's value cannot be changed after it is set.

Answer 4

There are two ways to do it:
use global in every function
declare $GLOBALS[] once outside the function
$titleArray = [];
// $GLOBALS['titleArray'] = [];
function foo(){
global $titleArray;
print_r($titleArray);
// print_r($GLOBALS['titleArray']);
}
function boo(){
global $titleArray;
array_push($this->titleArray, "Hello");
// array_push($GLOBALS['titleArray'], "Hello");
}