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class test
{
    function __construct()
    {
     //your code
    }
}
class test
{
    function test()//Èç¹û·½·¨Ãû¸úÀàÃû×ÖÒ»Ñù£¬½«±»ÈÏΪÊǹ¹Ô캯Êý
    {
    //your code
    }
}
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class test
{
    public $test = '';
    function __construct($input = '')
    {
        $this->test = $input;
    }
    function getTest()
    {
        return $this->test;
    }
}
$a = new test('a test');
echo $a->getTest()//½«Êä³ö a test
$b = new test();
echo $a->getTest()//ûÓÐÈκÎÊä³ö£¨ÆäʵÊÇÓÐÊä³ö£¬µ«ÊÇÊä³öΪ¿Õ£©


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# cd mysql-5.0.21
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<?php
  session_start();
 
  if (empty($_SESSION['count'])) {
      $_SESSION['count'] = 1;
  } else {
      $_SESSION['count']++;
  }
  var_dump($_SESSION);
 
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