It is not correct that the same information can be obtained from the server. For example, the server will not give you information about client side memory usage.
(PHP 5 >= 5.3.0, PHP 7)
mysqli::get_connection_stats -- mysqli_get_connection_stats — Returns statistics about the client connection
面向对象风格
过程化风格
Returns statistics about the client connection. 仅可用于 mysqlnd。
link仅以过程化样式：由mysqli_connect() 或 mysqli_init() 返回的链接标识。
Returns an array with connection stats if success, FALSE otherwise.
Example #1 A mysqli_get_connection_stats() example
<?php
$link = mysqli_connect();
print_r(mysqli_get_connection_stats($link));
?>
以上例程的输出类似于：
Array
(
[bytes_sent] => 43
[bytes_received] => 80
[packets_sent] => 1
[packets_received] => 2
[protocol_overhead_in] => 8
[protocol_overhead_out] => 4
[bytes_received_ok_packet] => 11
[bytes_received_eof_packet] => 0
[bytes_received_rset_header_packet] => 0
[bytes_received_rset_field_meta_packet] => 0
[bytes_received_rset_row_packet] => 0
[bytes_received_prepare_response_packet] => 0
[bytes_received_change_user_packet] => 0
[packets_sent_command] => 0
[packets_received_ok] => 1
[packets_received_eof] => 0
[packets_received_rset_header] => 0
[packets_received_rset_field_meta] => 0
[packets_received_rset_row] => 0
[packets_received_prepare_response] => 0
[packets_received_change_user] => 0
[result_set_queries] => 0
[non_result_set_queries] => 0
[no_index_used] => 0
[bad_index_used] => 0
[slow_queries] => 0
[buffered_sets] => 0
[unbuffered_sets] => 0
[ps_buffered_sets] => 0
[ps_unbuffered_sets] => 0
[flushed_normal_sets] => 0
[flushed_ps_sets] => 0
[ps_prepared_never_executed] => 0
[ps_prepared_once_executed] => 0
[rows_fetched_from_server_normal] => 0
[rows_fetched_from_server_ps] => 0
[rows_buffered_from_client_normal] => 0
[rows_buffered_from_client_ps] => 0
[rows_fetched_from_client_normal_buffered] => 0
[rows_fetched_from_client_normal_unbuffered] => 0
[rows_fetched_from_client_ps_buffered] => 0
[rows_fetched_from_client_ps_unbuffered] => 0
[rows_fetched_from_client_ps_cursor] => 0
[rows_skipped_normal] => 0
[rows_skipped_ps] => 0
[copy_on_write_saved] => 0
[copy_on_write_performed] => 0
[command_buffer_too_small] => 0
[connect_success] => 1
[connect_failure] => 0
[connection_reused] => 0
[reconnect] => 0
[pconnect_success] => 0
[active_connections] => 1
[active_persistent_connections] => 0
[explicit_close] => 0
[implicit_close] => 0
[disconnect_close] => 0
[in_middle_of_command_close] => 0
[explicit_free_result] => 0
[implicit_free_result] => 0
[explicit_stmt_close] => 0
[implicit_stmt_close] => 0
[mem_emalloc_count] => 0
[mem_emalloc_ammount] => 0
[mem_ecalloc_count] => 0
[mem_ecalloc_ammount] => 0
[mem_erealloc_count] => 0
[mem_erealloc_ammount] => 0
[mem_efree_count] => 0
[mem_malloc_count] => 0
[mem_malloc_ammount] => 0
[mem_calloc_count] => 0
[mem_calloc_ammount] => 0
[mem_realloc_count] => 0
[mem_realloc_ammount] => 0
[mem_free_count] => 0
[proto_text_fetched_null] => 0
[proto_text_fetched_bit] => 0
[proto_text_fetched_tinyint] => 0
[proto_text_fetched_short] => 0
[proto_text_fetched_int24] => 0
[proto_text_fetched_int] => 0
[proto_text_fetched_bigint] => 0
[proto_text_fetched_decimal] => 0
[proto_text_fetched_float] => 0
[proto_text_fetched_double] => 0
[proto_text_fetched_date] => 0
[proto_text_fetched_year] => 0
[proto_text_fetched_time] => 0
[proto_text_fetched_datetime] => 0
[proto_text_fetched_timestamp] => 0
[proto_text_fetched_string] => 0
[proto_text_fetched_blob] => 0
[proto_text_fetched_enum] => 0
[proto_text_fetched_set] => 0
[proto_text_fetched_geometry] => 0
[proto_text_fetched_other] => 0
[proto_binary_fetched_null] => 0
[proto_binary_fetched_bit] => 0
[proto_binary_fetched_tinyint] => 0
[proto_binary_fetched_short] => 0
[proto_binary_fetched_int24] => 0
[proto_binary_fetched_int] => 0
[proto_binary_fetched_bigint] => 0
[proto_binary_fetched_decimal] => 0
[proto_binary_fetched_float] => 0
[proto_binary_fetched_double] => 0
[proto_binary_fetched_date] => 0
[proto_binary_fetched_year] => 0
[proto_binary_fetched_time] => 0
[proto_binary_fetched_datetime] => 0
[proto_binary_fetched_timestamp] => 0
[proto_binary_fetched_string] => 0
[proto_binary_fetched_blob] => 0
[proto_binary_fetched_enum] => 0
[proto_binary_fetched_set] => 0
[proto_binary_fetched_geometry] => 0
[proto_binary_fetched_other] => 0
)
It is not correct that the same information can be obtained from the server. For example, the server will not give you information about client side memory usage.
While this function is only available if you're using the PHP MySQL Native Driver, you can get the same statistics without this function by using the MySQL SHOW STATUS Query.
Use 'SHOW SESSION STATUS;' for statistics about the current MySQL session.
Use 'SHOW GLOBAL STATUS;' for totals since the server was started.
After you have established a connection with the MySQL Server:
<?php
$result = $mysqli->query('SHOW SESSION STATUS;', MYSQLI_USE_RESULT);
while ($row = $result->fetch_assoc()) {
$array[$row['Variable_name']] = $row['Value'];
}
$result->close();
print_r($array);
?>