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$aa="test";
function test()
{
    global $aa;
    echo $aa;
}
test(); //print test
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$aa="test"
function test()
{
    echo $aa;
}
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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";
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<?php
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echo $_SERVER['PHP_SELF']."<br />";
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$a="hello"; 
$b=&$a;
unset($b);
$b="world"; 
echo $a;
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