Question

希望你能帮忙，把头发撕成碎片！

我有......

$result = mysqli_query($con,'SELECT this FROM that');

while($row = mysqli_fetch_array($result)) 
    {
        echo $row['this'] . ',';
    }

返回... 222,225,243,256,260,269,273,280,295,296，

我需要删除最后一个逗号才能给我... 222,225,243,256,260,269,273,280,295,296

我已经尝试了trim rtrim substr以及我能找到的所有其他内容，但其中没有一项可行。认为它与$row['this'] . ','的串联有关，但我无法弄清楚如何解决它！

任何帮助都将不胜感激。

干杯，标记

Answer 1

让MySQL为您完成工作：

$result = mysqli_query($con, 'SELECT GROUP_CONCAT(this, ',') as thises FROM that');

这将结果构造为逗号分隔的字符串。您可以通过名称thises来引用它。

Answer 2

使用rtrim删除最后一个逗号。

3 is the same as 0011 in binary, and inverse of that is 1100
2 is the same as 0010 in binary, and inverse of that is 1101
5 is the same as 0101 in binary, and inverse of that is 1010
10 is the same as 1010 in binary.

10 & ~3 => 1010 & 1100 = 1000 => 8
10 & ~5 => 1010 & 1010 = 1010 => 10
10 & ~2 => 1010 & 1101 = 1000 => 8

Answer 3

你可以使用implode

rtrim($my_string,',');

implode的功能

while($row = mysqli_fetch_array($result)) 
    {
        $a[]= $row['this'];
    }

$b = implode(',',$a);

print_r($b);

Answer 4

您可以使用 substr（）

这是您的代码

$result = mysqli_query($con,'SELECT this FROM that');

while($row = mysqli_fetch_array($result)) 
{
   echo $row['this'] . ',';
}

代码应该是这样的

$result = mysqli_query($con,'SELECT this FROM  that');
$my_string = "";
while($row = mysqli_fetch_array($result)) 
{
   $my_string .= $row['this'] . ',';
}
$my_final_string = substr($my_string, 0, strlen($my_string)-1);
echo $my_final_string;

<强>解释

 substr(string,start,length)

字符串 =您生成的字符串

开始 =您要从哪个位置开始字符串。

长度 =正数 - 从start参数返回的长度。负数 - 从字符串末尾返回的长度

从连接的查询字符串结果中删除尾随逗号

4 个答案: