PHP gets the number of database queries to generate a page_PHP tutorial

function __construct()
{
	parent::__construct();
	global $queries;
}

// 执行SQL语句
public function query($query)
{
	//echo $query.'<br />';
	++$GLOBALS['queries'];
	return $this->result = mysql_query($query, $this->link);
}

public function content($id = 0)
{
	$GLOBALS['queries'] = 0;
	// something to do
	echo $GLOBALS['queries'];
}

// 计时函数 
public function runtime($mode = 0) { 
	static $t; 
	if(!$mode) { 
		$t = microtime(); 
		return; 
	} 
	$t1 = microtime(); 
	//list($m0,$s0) = split(" ",$t);
	list($m0,$s0) = explode(" ",$t);
	//list($m1,$s1) = split(" ",$t1);
	list($m1,$s1) = explode(" ",$t1);
	return sprintf("%.3f ms",($s1+$m1-$s0-$m0)*1000); 
} 

public function content($id = 0)
{
	$this -> runtime();
	$GLOBALS['queries'] = 0;
	// something to do
	echo $GLOBALS['queries'];
	echo $this -> runtime(1);
}