Array and string offset access syntax with curly braces is no longer support

PHP7.4 Curly braces can no longer be used to access the offset of an array or string . Need to put {} Modified into [] You can solve the problem

If the code logic contains similar

  $asc = ord($s{0}) * 256 + ord($s{1}) - 65536;
Need to be modified to

$asc = ord($s[0]) * 256 + ord($s[1]) - 65536;

Link to the original text ：https://blog.csdn.net/sinat_29193161/article/details/112801403