- join: documentation ( source)
<?php
class T { private $a = array(); public function add($item) { $this->a[] = $item; } public function printIt() { echo join(', ', $this->a) . "\n"; } }
$a = new T();
$a->add(1);
$b = clone $a;
$b->add(2);
$a->printIt();
$b->printIt();