Count nested shortcodes, then reset for next parent shortcode - php

Question

Bit of an interesting question that's puzzling me, so I know how to count how many times a shortcode is called on a page using a static counter. However, I want to reset the counter whenever the parent shortcode is called:
<?php function gw_row($atts, $content = null) {
return '<div class="gw-row">'.do_shortcode($content).'</div>';
} add_shortcode("gw-row", "gw_row");
function gw_column($atts, $content = null) {
static $count = 0; $count++; if($count > 5){$count = 0}
return '<div class="column">'.do_shortcode( $content ).'</div>';
} add_shortcode("gw-column", "gw_column");?>
So explaining it further, there will be multiple [gw-row] shortcodes on a page, this is the 'Parent Shortcode'. Within this shortcode I use [gw-column]. I want to count how many columns are used on the page within each parent shortcode.
Example:
[gw-row]
[gw-column]$Count = 1[/gw-column]
[gw-column]$Count = 2[/gw-column]
[/gw-row]
Reset $count
[gw-row]
[gw-column]$Count = 1[/gw-column]
[gw-column]$Count = 2[/gw-column]
[gw-column]$Count = 3[/gw-column]
[/gw-row]
Reset $count
I've thought about making [gw-row] an object and resetting $count just after the closing of the <div> which might work, but I wonder if there's a better way?
My thoughts:
<?php function gw_row($atts, $content = null) {
global $count;
ob_start();?>
<div class="gw-row">
<?php do_shortcode($content);?>
</div><?php $count = 0;?>
<?php return ob_clean();
} add_shortcode("gw-row", "gw_row");
function gw_column($atts, $content = null) {
$count++; if($count > 5){$count = 0}
return '<div class="column">'.do_shortcode( $content ).'</div>';
} add_shortcode("gw-column", "gw_column");?>

Answer 1

Ok so I was seriously overthinking this, the solution is quite simple and close to what I suggested.
Simply define $count globally and set it to 0 in the [gw-row] shortcode. This will reset it every time it's called:
<?php function gw_row($atts, $content = null) {
global $count; $count = 0;
return '<div class="gw-row">'.do_shortcode($content).'</div>';
} add_shortcode("gw-row", "gw_row");
function gw_column($atts, $content = null) {
global $count; $count++; if($count > 5){$count = 0}
return '<div class="column">'.do_shortcode( $content ).'</div>';
} add_shortcode("gw-column", "gw_column");?>