PHP mysql_fetch_array ʹÓÃÎÊÌâ

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<?php
  $sqlstr="select news_picaddress,news_head from news where news_pic=1";
  mysql_connect("localhost","myuserid","mypassword");
  $result = mysql_db_query("xinwen",$sqlstr);  
  printf("Return Rows Num: %d\n",mysql_num_rows($result));//Êä³ö2
  printf("Return news_picaddress: %s\n",mysql_result($result,0,"news_picaddress"));//Êä³ö²éµ½µÄµØÖ·
  while ($rs=mysql_fetch_array($result))
  {  
  print_r($rs); //Êä³ö1£» 
  $picaddress=$rs[0]; // $picaddressΪnull
  $picaddress=$rs['news_picaddress']; // $picaddressΪnull
  $picaddress=$rs["news_picaddress"]; // $picaddressΪnull
  }
?>
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printf("Return news_picaddress: %s\n",mysql_result($result,0,"news_picaddress"));//Êä³ö²éµ½µÄµØÖ·
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PHP code:

$sqlstr="select