描述此 Pull Request 的变更

兼容 PHP 8.1:

Passing null to a non-nullable argument of a built-in function is deprecated.

描述变更理由

基于 PHP 8.1 升级文档： https://github.com/php/php-src/blob/php-8.1.0beta2/UPGRADING

不兼容性其中一点为：

Passing null to a non-nullable argument of a built-in function is
deprecated. This matches the behavior of user-defined functions, where null
is never accepted by non-nullable arguments.
user-defined functions.

   var_dump(str_contains("foobar", null));
   // Deprecated: Passing null to parameter #2 ($needle) of type string
   //             is deprecated

RFC: https://wiki.php.net/rfc/deprecate_null_to_scalar_internal_arg

点2: float 需要明确转换为 Int:

Implicit conversion of floats to integers that result in loss of precision,
e.g. a truncation from 1.9 to 1, is deprecated. This affects array keys,
int parameter and return types, and operators working on integers.
RFC: https://wiki.php.net/rfc/implicit-float-int-deprecate

点3:

Automatic conversion of "false" into an empty array on write operands is deprecated.
RFC: https://wiki.php.net/rfc/autovivification_false

对不向前兼容或涉及安全性变更的特殊说明

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