使用PHP和PDO处理MySQL数据

Question

I am using PHP PDO and MySQL and would like to convert a MySQL table like this:

|Listing ID | Image ID |
|  1234     |     1    |
|  1234     |     2    |
|  1234     |     3    |
|  1235     |     1    |
|  1235     |     2    |

Into a PHP array like the one below, which I can parse through and insert into another MySQL table using PDO.

[url/path/1234-1:::url/path/1234-2:::url/path/1234-3, url/path/1235-1:::url/path/1234-2]

Here is the code I've written so far. I believe there is an issue with the way the while loops are working as it only picks up the first Listing string and causes an infinite loop.

//Set folder path
$target_path = realpath($_SERVER['DOCUMENT_ROOT']). "\path\uploads\\";

//Query to download all listing IDs in Markers table 
$query = $db->query("SELECT * FROM image");
$row = $query->fetch(PDO::FETCH_ASSOC);
while ($row = $query->fetch(PDO::FETCH_ASSOC)) {
$temp = $target_path.$row['L_ListingID']."-".$row['L_ImageID'].".jpg";
   //ListingID equals ListingID, append to array
   $LI = substr($temp, 40, 8);
   while($LI = $LI) {
    $temp = $temp.":::".$temp;
    echo $temp;
   }
}

This is the output which is an infinite loop. Notice that it starts at the second item in the table and hangs there:

C:\path\uploads\40532208-2.jpg:::C:\path\uploads\40532208-2.jpgC:\C:\path\uploads\40532208-2.jpg...ad infinitum

Answer 1

while($LI = $LI) causes the infinite loop.

I guess that is what you want

$target_path = realpath($_SERVER['DOCUMENT_ROOT']). "\path\uploads\\";
$query = $db->query("SELECT * FROM image");
while ($row = $query->fetch(PDO::FETCH_ASSOC)) {
   $temp[] = $row;
}
foreach($temp as $i=>$v){
    $line = $v['L_ListingID']."-".$v['L_ImageID'].".jpg";
    $prod[] = $line.($temp[$i] == $temp[$i+1])?":::":",";
}

echo trim(implode($prod),",");

The code is not tested, but I think that the direction is like there.