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bool mssql_select_db(string database_name[,resource link_identifier)
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a. ²ÎÊý database_nameΪָ¶¨µÄ·þÎñÆ÷ÉÏ¿ÉÓõÄÊý¾Ý¿âÃû³Æ£¬ÒÔ×Ö·û´®±íʾ¡£
b.²ÎÊýlink_identifierΪָ¶¨º¯Êýmssql_connect()´ò¿ªSQL Server µÄÁ¬½Ó±êʶ¡£Èç¹ûÊ¡ÂԸòÎÊý£¬ÏµÍ³½«»á×Ô¶¯µ÷ÓÃ×îºóÒ»´Î´ò¿ªSQL Server·þÎñÆ÷µÄÁ¬½Ó¡£
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<?php
$hostname="datahost";
$dbuser="sa";
$dbpasswd="123";
$conn=mssql_connect($hostname,$dbuser,$dbpasswd);
if ($conn)
{
   $db_name="ming";
   $myselect_db=mssql_select_db($db_name);
    if($myselect_db)
{
   echo "<font color=#666666>ÄúÑ¡ÔñµÄÊý¾Ý¿â:  </font><strong><font color=green>".$db_name."</font></strong>";
}
else
{
  echo "ûÓÐÑ¡¶¨Êý¾Ý¿â:   <strong><font color=red>".$db_name."</font></strong>";
}
}
else
{
echo "Á¬½Óʧ°Ü£¡";
}
mssql_close($conn);
?>
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 if(!$strUrl||!$strMethod){ return "";}
 $strMethod = strtoupper($strMethod);
 $arrUrl = parse_url($strUrl);
 if($arrUrl["port"]==0){$arrUrl["port"]=80;}
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<?php
$a = "hello";
$b =&$a;
unset($b);
echo '$a:'.$a;
//output:$a:hello
?> ......
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