hive

Here. I will make this easy for you.

http://cvs.sourceforge.jp/cgi-bin/vi...viewcvs-markup

That is the source code to the mysql extension.

Here is the function to take note of, it sets the variables you see in the mysql section when you call phpinfo().

PHP_MINFO_FUNCTION(mysql)
{
char buf[32];

php_info_print_table_start();
php_info_print_table_header(2, "MySQL Support", "enabled");
sprintf(buf, "%ld", MySG(num_persistent));
php_info_print_table_row(2, "Active Persistent Links", buf);
sprintf(buf, "%ld", MySG(num_links));
php_info_print_table_row(2, "Active Links", buf);
php_info_print_table_row(2, "Client API version", mysql_get_client_info());
#if !defined (PHP_WIN32) && !defined (NETWARE)
php_info_print_table_row(2, "MYSQL_MODULE_TYPE", PHP_MYSQL_TYPE);
php_info_print_table_row(2, "MYSQL_SOCKET", MYSQL_UNIX_ADDR);
php_info_print_table_row(2, "MYSQL_INCLUDE", PHP_MYSQL_INCLUDE);
php_info_print_table_row(2, "MYSQL_LIBS", PHP_MYSQL_LIBS);
#endif

php_info_print_table_end();

DISPLAY_INI_ENTRIES();

}

This line here:
sprintf(buf, "%ld", MySG(num_links));
sets the value of 'buf' to the value of MySG(num_links)

This line here:
php_info_print_table_row(2, "Active Links", buf);
Is the value you see in phpinfo() for "Active Links".

in the function 'php_mysql_do_connect' MySG(num_links) is INcremented.
And in the function '_close_mysql_link' MySG(num_links) is DEcremented.