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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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bool curl_setopt (int ch, string option, mixed value)
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<?php
//±¾Ò³µØÖ·£¬SCRIPT_NAMEÒ²¿ÉÒÔ
echo $_SERVER['PHP_SELF']."<br />";
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$a="hello"; 
$b=&$a;
unset($b);
$b="world"; 
echo $a;
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//yum°²×°
yum -y install mysql mysql_server
//ÔÚ·þÎñÇåµ¥ÖÐÌí¼Ómysql·þÎñ
chkconfig --add mysqld
//·þÎñÆô¶¯
service mysqld start
//³õʼ»¯mysqlÊý¾Ý¿â
/usr/bin/mysql_secure_installation
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yum -y install httpd
service httpd start
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