PHP升级到7.2后，有哪些注意事项需要特别注意？

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最近升级了PHP版本，从7.1升至7.2。升级前的版本信息如下：PHP 7.1.14 (cli) (built: Feb 2 2018 08:42:59) (NTS) Copyright (c) 1997-2018 The PHP Group Zend Engine v3.1.0, Copyright (c) 1998-2018 Zend Technologies with Zend OPcache v

最近升级了PHP版本，从7.1升级到7.2，升级前版本：

PHP 7.1.14 (cli) (built: Feb 2 2018 08:42:59) ( NTS ) Copyright (c) 1997-2018 The PHP Group Zend Engine v3.1.0, Copyright (c) 1998-2018 Zend Technologies with Zend OPcache v7.1.14, Copyright (c) 1999-2018, by Zend Technologies with Xdebug v2.6.0, Copyright (c) 2002-2018, by Derick Rethans

升级后版本：

PHP 7.2.2 (cli) (built: Feb 24 2018 17:51:12) ( ZTS DEBUG ) Copyright (c) 1997-2018 The PHP Group Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies with Zend OPcache v7.2.2, Copyright (c) 1999-2018, by Zend Technologies