WordPress at a glance
function is not described

SimplePie::get_image_width() public WP 1.0

Get the feed logo's link

RSS 2.0 feeds are allowed to have a "feed logo" width.

Uses <image><width> or defaults to 88.0 if no width is specified and the feed is an RSS 2.0 feed.

{} It's a method of the class: SimplePie{}

No Hooks.

Return

Int|float|null. Nothing.

Usage

$SimplePie = new SimplePie();
$SimplePie->get_image_width();

Code of SimplePie::get_image_width() WP 5.7.2

<?php
public function get_image_width()
{
	if ($return = $this->get_image_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'width'))
	{
		return round($return[0]['data']);
	}
	elseif ($this->get_type() & SIMPLEPIE_TYPE_RSS_SYNDICATION && $this->get_image_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'url'))
	{
		return 88.0;
	}

	return null;
}