Question

php如何判断这个查询为空啊

<?php session_start();include("conn/conn.php");
$cha=mySQL_query("select * from usersname where yongfu ='$yongfu'");
while ($st=mysql_fetch_array($cha))
{
if （$st[yongfu]==""）
{
echo 'aaaaa';

}
}
?>
我以解决了

Answer 1

<?php session_start();include("conn/conn.php");
$cha=mySQL_query("select * from usersname where yongfu ='$yongfu'");
$st=mysql_fetch_array($cha);
if($st[yongfu]=="" or $st[yongfu]=="NULL"）｛ echo '为空';
}else{
echo '不为空';
}

?>

Answer 2

那个值?mysql_fetch_array($cha)?

Answer 3

if(mysql_num_rows($cha) > 0)
{
//.....
}

Answer 4

<?php session_start();include("conn/conn.php");
$cha=mySQL_query("select * from usersname where yongfu ='$yongfu'");
$st=mysql_fetch_array($cha);
if(count($st)==0){
echo '为空';
}else{
echo '不为空';
}

?>