Function doesn't save variable - php

Question

I'm trying to add 1 to a number each time a function is called, but for some reason, the total number is always same.
Here is my current code:
<?php
$total;
function draw_card() {
global $total;
$total=$total+1;
echo $total;
}
draw_card();
draw_card();
?>

Answer 1

Personally, I would not use globals, but if I was forced at gunpoint I would handle state within the function, so outside variables did not pollute the value. I would also make an arbitrary long key name which I would not use anywhere else.
<?php
function draw_card($initial = 0) {
$GLOBALS['draw_card_total'] = (
isset($GLOBALS['draw_card_total']) ? $GLOBALS['draw_card_total']+1 : $initial
);
return $GLOBALS['draw_card_total'];
}
// optionally set your start value
echo draw_card(1); // 1
echo draw_card(); // 2
https://3v4l.org/pinSi
But I would more likely go with a class, which holds state by default, plus its more verbose as to whats happening.
<?php
class cards {
public $total = 0;
public function __construct($initial = 0)
{
$this->total = $initial;
}
public function draw()
{
return ++$this->total;
}
public function getTotal()
{
return $this->total;
}
}
$cards = new cards();
echo $cards->draw(); // 1
echo $cards->draw(); // 2
echo $cards->getTotal(); // 2
https://3v4l.org/lfbcL

Answer 2

Since it is global already, you can use it outside the function.
<?php
$total;
function draw_card() {
global $total;
$total=$total+1;
//echo $total;
}
draw_card();
draw_card();
draw_card();
echo "Current Count :", $total;
?>
Result :
Current Count :3
This will increment the number of times you call the function.
Since you echoed the result/total each time without a delimiter, you might have considered the output to be 12(Assumption)

Answer 3

Functions have a scope.. you just need to bring $total into the scope of the function... best to not do it globally but as an argument.
$total = 0;
function draw_card($total) {
return $total + 1;
}
$total = draw_card($total);
//Expected Output = 1
$total = draw_card($total);
//Expected Output = 2