Fatal error: Array and string offset access syntax with curly braces is no longer supported in D:\software\phpstudy_pro\WWW\xiaoweiphp.com\editor\php\JSON.php on line 156

1.报错原因是:PHP7.4不再能够使用花括号来访问数组或者字符串的偏移

2.解决办法：将{}改成[]

3.报错时的代码:

$bytes = (ord($utf16{0}) << 8) | ord($utf16{1});

4.修改后的代码

$bytes = (ord($utf16[0]) << 8) | ord($utf16[1]);