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Home Backend Development PHP Tutorial 关于mysql_fetch_array 的问题

关于mysql_fetch_array 的问题

Jun 23, 2016 pm 02:09 PM

我从数据库中获取6个图片url,然后用mysql_fetch_array将获取的值传给数组$row,但是打印$row时显示所取得6个url全都集中在$row[0]中,打印$row[1]时就显示错误。代码如下:

$conn=mysql_connect("localhost","root");mysql_select_db("xinshi");$sql="select image from photo order by id desc limit 6";$result=mysql_query($sql);//while ($row=mysql_fetch_array($result)){//print_r($row);}$row=mysql_fetch_array($result,MYSQL_NUM);print_r($row); mysql_close($conn);
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代码就像上面那样,当我不用while时,打印结果只有$row[0]有值,从$row[1]开始之后都没有值。用while时就显示所有值都存在$row[0]里面,其他元素都没有值。


回复讨论(解决方案)

不用while时,mysql_fetch_array 只是返回一条记录的数组,所以只有0有值
当用while时,while ($row=mysql_fetch_array($result)) 始终都在改变$row的值,$row本身的数组元素个数并没有改变。

楼上正解,LZ要数组的话可以这么写


include "mysqlconnect.php";
$sql ='select mealuid from mealtable';
$result=mysql_query($sql);
while ($row=mysql_fetch_array($result)) {
$arr[]=$row;
}

print_r($arr);


?>

不用while时,mysql_fetch_array 只是返回一条记录的数组,所以只有0有值
当用while时,while ($row=mysql_fetch_array($result)) 始终都在改变$row的值,$row本身的数组元素个数并没有改变。
那我如何取出这6个值?我要把这6个url连接到页面上的关于mysql_fetch_array 的问题去显示出来

楼上正解,LZ要数组的话可以这么写


include "mysqlconnect.php";
$sql ='select mealuid from mealtable';
$result=mysql_query($sql);
while ($row=mysql_fetch_array($result)) {
$arr[]=$row;
}

print_r($arr);


?>
打印出来是这样的
Array (
[0] => Array ( [0] => upload/2013/05/08/14303.jpeg [image] => upload/2013/05/08/14303.jpeg )
[1] => Array ( [0] => upload/2013/05/03/14297 [image] => upload/2013/05/03/14297 )
[2] => Array ( [0] => upload/2013/05/03/14299.i [image] => upload/2013/05/03/14299.i )
[3] => Array ( [0] => upload/2013/05/03/14301.a [image] => upload/2013/05/03/14301.a )
[4] => Array ( [0] => upload/2013/05/03/137.image/jpeg [image] => upload/2013/05/03/137.image/jpeg )
[5] => Array ( [0] => upload/2013/05/03/14302image/jpeg [image] => upload/2013/05/03/14302image/jpeg )
)
这是怎么回事?这个结构什么意思?

while ($row=mysql_fetch_array($result)) {      echo "<img  src='$row[0]' / alt="关于mysql_fetch_array 的问题" >\n";}
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while ($row=mysql_fetch_array($result)) {      echo "<img  src='$row[0]' / alt="关于mysql_fetch_array 的问题" >\n";}
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我就是想把这6个url放到数组中6个元素里面好供我使用,怎么弄?

while ($row=mysql_fetch_array($result,MYSQL_NUM)) {
$arr[]=$row;
}

print_r($arr);

<?phpinclude "mysqlconnect.php";$sql ='select mealuid from mealtable';$result=mysql_query($sql);while ($row=mysql_fetch_array($result)) {    $arr[] = $row[0];}print_r($arr);?>
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一维数组????
这样应该就没问题了

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