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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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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";
$result = mysql_query($ ......

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//yum°²×°
yum -y install mysql mysql_server
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chkconfig --add mysqld
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service mysqld start
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/usr/bin/mysql_secure_installation
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yum -y install httpd
service httpd start
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