The way I’d do it is to not use global variables.
This is a simple class that uses 3 methods and 1 property to hook into the_post
and echo the post ID in the footer.
/**
* Plugin Name: WPSE_263293 Example
*/
class wpse_263293 {
protected $ID;
//* Add actions on init
public function init() {
add_action( 'the_post', [ $this, 'the_post' ] );
add_action( 'wp_footer', [ $this, 'footer' ] );
}
public function the_post( $post ) {
//* Only do this once
remove_action( 'the_post', [ $this, 'the_post' ] );
//* This is the property we're interested in
$this->ID = $post->ID;
}
public function footer() {
//* Print the ID property in the footer
echo $this->ID;
}
}
//* Initiate the class and hook into init
add_action( 'init', [ $wpse_263293 = new wpse_263293(), 'init' ] );
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