PHP XML Output from mySQL Database -

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i pulling information sql database , forming xml via php. attempting make xml format this: 

<channel>     <channel_name>asn</channel_name>     <program id="1">         <title>the simpson</title>         <info>melfi considers turning homer help...</info>         <season>s01</season>         <episode>e09</episode>         ...         <channel>asn</channel>     </program> </channel> <channel>     <channel_name>nbc</channel_name>     <program id="2">         <title>the simpson</title>         <info>melfi considers turning homer help...</info>         <season>s02</season>         <episode>e04</episode>         ...         <channel>nbc</channel>     </program> </channel> ...etc

this php attempting mimic xml structure above:

<?php header('content-type: application/xml; charset=utf-8');     include_once "db_connect.php";     //sql query     $program_sql = <<<sql     select * programs sql;     if ($result = $db->query($program_sql)) {         /* fetch associative array */         while ($row = mysqli_fetch_assoc($result)) {             //data             #descriptions             $program_title = $row['program_title'];             $program_id = $row['program_id'];             $program_info = $row['program_info'];             #guides             $program_season = $row['program_season'];             $program_episode = $row['program_episode'];             $program_genre = $row['program_genre'];             #times             $program_duration_hours = $row['program_duration_hours'];             $program_duration_mins = $row['program_duration_mins'];             $program_day = $row['program_day'];             $program_time_start = $row['program_time_start'];             $program_time_end = $row['program_time_end'];             #assets             $program_image_fullsize = $row['program_image_fullsize'];             $program_image_thumbnail = $row['program_image_thumbnail'];             #channel             $channel .= $row['channel'];             //xml output             $output .= "<program id='".$program_id."'>         <title>".$program_title."</title>         <info>".$program_info."</info>         <season>s".$program_season."</season>         <episode>e".$program_episode."</episode>         <duration>             <hours>".$program_duration_hours."</hours>             <minutes>".$program_duration_mins."</minutes>         </duration>         <day>".$program_day."</day>         <time>             <start>".$program_time_start."</start>             <end>".$program_time_end."</end>         </time>         <genre>".$program_genre."</genre>         <image>             <fullsize>/images/program_images/".$program_image_fullsize."</fullsize>             <thumbnail>/images/program_images/thumbnails/".$program_image_thumbnail."</thumbnail>         </image>         <channel>".$channel."</channel>     </program>";         }//channel while loop     }//if      echo $output;     mysqli_close($db); ?>

my php outputting program node; how go wrapping these in corresponding channel tags?

try this.

$rows = [     ['channel_name' => 'asn', 'program_id' => 1, 'program_title' => 'program 1'],     ['channel_name' => 'asn', 'program_id' => 2, 'program_title' => 'program 2'],     ['channel_name' => 'nbc', 'program_id' => 3, 'program_title' => 'program 3'], ];  // pre grouping pattern $grouped = array_reduce($rows, function($channels, $row) {     if (!array_key_exists($row['channel_name'], $channels)) {         $channels[$row['channel_name']] = [];     }     $channels[$row['channel_name']][] = $row;      return $channels; }, []);  foreach ($grouped $channelname => $program) {     // build xml }  // or simplexml pattern $root = new simplexmlelement('<root />');  foreach ($rows $row) {     $channel = $root->xpath("/root/channel/channel_name[text()='{$row['channel_name']}']/parent::node()");     if (count($channel) === 0) {         $channel = $root->addchild('channel');         $channel->addchild('channel_name', $row['channel_name']);     } else {         $channel = $channel[0];     }      $program = $channel->addchild('program');     $program->addattribute('id', $row['program_id']);     $program->addchild('title', $row['program_title']); }  echo $root->asxml();

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