php7中的随机数，序列化及unicode增强

<?php
//random_bytes
//random_int
//unserialize可自定义过滤
//unicode增强\u{code-point}

header("Content-type: text/html; charset=UTF-8");

$bytes = random_bytes(10);
echo $bytes;
echo '<br/>';

$int = random_int(3, 20);
echo $int;
echo '<br/>';

class Customer {
    public function __construct() {
        echo '__construct';
    }

    public function __destruct() {
        echo '__destruct';
    }
    public function __toString() {
        echo '__toString';
        return '__toString';
    }
    public function __call($name, $arguments) {
        echo '__call';
    }
}

$customer = new Customer();

$s = serialize($customer);
echo '!!!!!<br/>';
$u = unserialize($s);
echo '@@@@@<br/>';
echo get_class($u);
echo '#####<br/>';
$u = unserialize($s, ['allowed_classes'=>false]);
echo '$$$$$<br/>';
echo get_class($u);
echo '%%%%%<br/>';

echo "the \u{1F632} face";
echo '<br/>';
echo "the \u{1F609} face";
echo '<br/>';
echo "the \u{1F60F} face";
echo '<br/>';

?>

输出：

�%�(�C���
14
__construct!!!!!
@@@@@
Customer#####
__destruct$$$$$
__PHP_Incomplete_Class%%%%%
the