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$aa="test";
function test()
{
    global $aa;
    echo $aa;
}
test(); //print test
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global $aa;
$aa="test"
function test()
{
    echo $aa;
}
test() // print ²»Êä³öÈκζ«Î÷


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php+mysqlÖеÄһЩÓï¾ä

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create table hyhtbsc(
id int(4) primary key auto_increment,
username varchar(20),
password varchar(20)
);
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<?php
$conn = mysql_connect("localhost","root","pass");
mysql_select_db("mydb",$conn);
$sql = "select * from mytable";
$result = mysql_query($ ......

PHP³¬È«¾Ö±äÁ¿Ö®$_SERVERµÄÏêϸÓ÷¨

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$_SERVER['argv'] #´«µÝ¸ø¸Ã½Å±¾µÄ²ÎÊý¡£
$_SERVER['argc'] #°üº¬´«µÝ¸ø³ÌÐòµÄÃüÁîÐвÎÊýµÄ¸öÊý£¨Èç¹ûÔËÐÐÔÚÃüÁîÐÐģʽ£©¡£
$_SERVER['GATEWAY_INTERFACE'] #·þÎñÆ÷ʹÓÃµÄ CGI ¹æ·¶µÄ°æ±¾¡£ÀýÈ磬“CGI/1.1”¡£
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PHP ¾Å¾Å³Ë·¨±í

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<?php
for($a =1;$a<=9;$a++)
{
  for($b =1;$b<=$a;$b++)
  {$c =$a *$b;
    echo "$a*$b=$c  ";
  }
    echo "<p>";
}
?> ......

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//yum°²×°
yum -y install mysql mysql_server
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chkconfig --add mysqld
//·þÎñÆô¶¯
service mysqld start
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/usr/bin/mysql_secure_installation
£¨2£©¡¢°²×°apache
yum -y install httpd
service httpd start
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