PHP: ArrayAccess - Manual

<?php class Obj implements ArrayAccess { public $container = [ "one" => 1, "two" => 2, "three" => 3, ]; public function offsetSet($offset, $value): void { if (is_null($offset)) { $this->container[] = $value; } else { $this->container[$offset] = $value; } } public function offsetExists($offset): bool { return isset($this->container[$offset]); } public function offsetUnset($offset): void { unset($th

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