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$test = "hello";
//  .  ×Ö·û´®Á¬½Ó·û
echo $test.".world"     // hello.world
 echo "$test.world"     // "" ÖеıäÁ¿½«±»½âÎö³ÉÏàÓ¦µÄÖµ
                                // hello.world
 echo '$test.world'       // µ¥ÒýºÅ' ' Ô­ÑùÊä³ö $test.world


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ÉîÒ¹ÏÐÁÄJavaÓëPHP ÒÔ¼°¼Ü¹¹Éè¼ÆË¼ÏëÓë×î¼Ñʵ¼ù
·¢ÐÅÈË: wesley (ÐÄÖеÄÉ­ÁÖ), ÐÅÇø: Java
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·¢ÐÅÕ¾: ˮľÉçÇø (Thu Dec 24 01:55:04 2009), Õ¾ÄÚ
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http://blog.sina.com.cn/s/blog_53923f940100g7xx.html
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php variable circular reference

 
Php Variable Circular References

Circular-references has been a long outstanding issue with PHP. They are
caused by the fact that PHP uses a reference counted memory allocation
mechanism for its internal variables. This causes problems for longer
running scripts (such as an Applicatio ......

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.$dbhost = 'localhost';  
$dbuser = 'root'; //ÄãµÄmysqlÓû§Ãû  
$dbpass = '123456'; //ÄãµÄmysqlÃÜÂë  
$dbname = 'data'; //ÄãµÄmysql¿âÃû  
//Á¬½Ó±¾µØÊý¾Ý¿â
$GLOBALS["conn"] = mysql_connect($dbhost,$dbuser,$dbpass);  
//´ò¿ªÊý¾Ý¿â
mysql_select ......
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