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mysqli_get_links_stats — Return information about open and cached links
mysqli_get_links_stats() returns information about open and cached MySQL links.
此函数没有参数。
mysqli_get_links_stats() returns an associative array with three elements, keyed as follows:
total
An integer indicating the total number of open links in any state.
active_plinks
An integer representing the number of active persistent connections.
cached_plinks
An integer representing the number of inactive persistent connections.