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函数mysqli_get_client_stats()用于获取MySQL客户端的统计信息。该函数返回一个关联数组，包含了当前会话中MySQL客户端的不同统计信息。

下面是一个示例，演示了如何使用mysqli_get_client_stats()函数：

php
<?php
// 创建数据库连接
$conn = mysqli_connect("localhost", "username", "password", "database");

// 获取客户端的统计信息
$clientStats = mysqli_get_client_stats();

// 打印统计信息
print_r($clientStats);

// 关闭数据库连接
mysqli_close($conn);
?>


输出的示例：


Array
(
[bytes_sent] => 123456
[bytes_received] => 654321
[packets_sent] => 123
[packets_received] => 321
[protocol_overhead_in] => 10
[protocol_overhead_out] => 20
[bytes_received_ok_packet] => 111
[bytes_received_eof_packet] => 222
[bytes_received_rset_header_packet] => 333
[bytes_received_rset_field_meta_packet] => 444
[bytes_received_rset_row_packet] => 555
[bytes_received_prepare_response_packet] => 666
[bytes_received_change_user_packet] => 777
[packets_sent_command] => 11
[packets_received_ok] => 22
[packets_received_eof] => 33
[packets_received_rset_header] => 44
[packets_received_rset_field_meta] => 55
[packets_received_rset_row] => 66
[packets_received_prepare_response] => 77
[packets_received_change_user] => 88
)



上述示例中，我们首先连接到MySQL数据库，然后调用mysqli_get_client_stats()函数获取客户端的统计信息，并将结果存储在$clientStats变量中。最后，我们使用print_r()函数打印出统计信息。

这些统计信息提供了关于数据传输量、数据包数量和协议开销等方面的信息，可以用于分析和优化MySQL客户端的性能。