预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

MySQL Memcache Plugin related

MYSQLND_MEMCACHE_DEFAULT_REGEXP (string): Default regular expression (PCRE style) used for matching SELECT statements that will be mapped into a MySQL Memcache Plugin access point, if possible. It is also possible to use mysqlnd_memcache_set(), but the default approach is using this regular expression for pattern matching.

Assorted

The version number of this plugin can be obtained by using MYSQLND_MEMCACHE_VERSION or MYSQLND_MEMCACHE_VERSION_ID. MYSQLND_MEMCACHE_VERSION is the string representation of the numerical version number MYSQLND_MEMCACHE_VERSION_ID, which is an integer such as 10000. Developers can calculate the version number as follows.

Version (part)	Example
Major*10000	1*10000 = 10000
Minor*100	0*100 = 0
Patch	0 = 0
MYSQLND_MEMCACHE_VERSION_ID	10000

MYSQLND_MEMCACHE_VERSION (string): Plugin version string, for example, 1.0.0-alpha.
MYSQLND_MEMCACHE_VERSION_ID (integer): Plugin version number, for example, 10000.

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官方地址：https://www.php.net/manual/en/mysqlnd-memcache.constants.php

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预定义常量

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