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<?php
class user
{
private static $count = 0 ; //¼Ç¼ËùÓÐÓû§µÄµÇ¼Çé¿ö.
public function __construct() {
self::$count = self::$count + 1;
}
public function getCount() {
return self::$count;
}
public function __destruct() {
self::$count = self::$count - 1;
}
}
$user1 = new user();
$user2 = new user();
$user3 = new user();
echo "now here have " . $user1->getCount() . " user";
echo "<br />";
unset($user3);
echo "now here have " . $user1->getCount() . " user";
?>
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<?php
class Math
{
public static $pi = 3.14;
}
// ÇóÒ»¸ö°ë¾¶3µÄÔ°µÄÃæ»ý¡£
$r = 3;
echo "°ë¾¶ÊÇ $r µÄÃæ»ýÊÇ<br />";
echo Math::$pi * $r * $r;
echo "<br /><br />";
//ÕâÀïÎÒ¾õµÃ 3.14 ²»¹»¾«È·£¬ÎÒ°ÑËüÉèÖõĸü¾«È·¡£
Math::$pi = 3.141592653589793;
echo "°ë¾¶ÊÇ $r µÄÃæ»ýÊÇ&
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<?php
class employee
{
protected $sal = 3000;
public function getSal() {
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