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@ 2018-09-13T00:06:27Z

<?php

class Node {
    public $next = null;                // define public to allow simple test case writing
    private $id;
    
    public function __construct($id) {
        $this->id = $id;
    }
    
    public function setNext(Node $next) {
        $this->next = $next;
    }
    
    public function action() {
        if ($this->next) {
            $this->next->action();
        }
        
        echo "action for {$this->id}" . PHP_EOL;
    }
}

// make a node list manually for testing
$id = 0;
$root = new Node(++ $id);
$root->next = new Node(++ $id);
$root->next = new Node(++ $id);
$root->next->next = new Node(++ $id);
$root->next->next->next = new Node(++ $id);
$root->next->next->next->next = new Node(++ $id);
$root->next->next->next->next->next = new Node(++ $id);

$root->action();

Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: action for 7 action for 6 action for 5 action for 4 action for 3 action for 1
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 action for 7 action for 6 action for 5 action for 4 action for 3 action for 1

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