将MySQL条目作为子项和父项排序

所以我有一个表，列是id、parent id和name

下面是显示的内容

1 Web Design
- 5 Templates
- 6 Finished Websites
2 Graphic Design
3 Photography
4 Image Manipulation

由此：

while($row = mysql_fetch_array( $result )) {
 echo $row['id'] . " ";
 echo $row['name'] . "<br/ >";

 while($row = mysql_fetch_array( $result2 )) {
  echo "- " . $row['id'] . " ";
  echo $row['name'] . "<br/ >";
 }
}

没关系，明白了

// Get all the data from the "example" table
$result = mysql_query("SELECT * FROM `portfolio-categories` WHERE `parent-id` ='0'")
or die(mysql_error());

// keeps getting the next row until there are no more to get

$parent = 0; 

while($row = mysql_fetch_array( $result )) {
    echo $row['id'] . " ";
    echo $row['name'];

    $parent += 1;
    echo "#" . $parent . "#";

    echo "<br/ >";

    $result2 = mysql_query("SELECT * FROM `portfolio-categories` WHERE `parent-id`=$parent")
or die(mysql_error());

    while($row = mysql_fetch_array( $result2 )) {
        echo "- " . $row['id'] . " ";
        echo $row['name'] . "<br/ >";
    }
}

没关系，明白了

// Get all the data from the "example" table
$result = mysql_query("SELECT * FROM `portfolio-categories` WHERE `parent-id` ='0'")
or die(mysql_error());

// keeps getting the next row until there are no more to get

$parent = 0; 

while($row = mysql_fetch_array( $result )) {
    echo $row['id'] . " ";
    echo $row['name'];

    $parent += 1;
    echo "#" . $parent . "#";

    echo "<br/ >";

    $result2 = mysql_query("SELECT * FROM `portfolio-categories` WHERE `parent-id`=$parent")
or die(mysql_error());

    while($row = mysql_fetch_array( $result2 )) {
        echo "- " . $row['id'] . " ";
        echo $row['name'] . "<br/ >";
    }
}

function items($parent_id) { $query = "SELECT * FROM mytable WHERE parent_id = $parent_id" $result = mysql_fetch_array(mysql_query($query)) foreach ($result as &$res) { echo $res['id'] . " "; echo $res['name'] . ""; echo items($parent_id) } }