Mapping SQL query results to JSON in PHP - php

Question

I'm running into some issues getting the correct JSON output from my SQL query. Essentially what I'm struggling with is getting an array of options objects as opposed to singular option objects.
$query = 'SELECT matchup.matchupID, matchup_option.player_name, matchup_option.player_id FROM matchup
INNER JOIN matchup_option
ON matchup_option.matchupID= matchup.matchupID;';
$attachments = $db->query($query);
$data = array();
while ($attachment = $db->fetch_array($attachments)){
$data[] = array (
'id' => $attachment['matchupID'],
'options' => array(
array (
"name" => $attachment['player_name'],
"playerid" => $attachment['player_id']
)
)
);
//VAR_DUMP($attachment);
}
$data = array("matchup"=>$data);
print json_encode($data);
Gives me this output:
{
"matchup":[
{
"id":"111222",
"options":[
{
"name":"111",
"playerid":"111"
}
]
},
{
"id":"111222",
"options":[
{
"name":"222",
"playerid":"222"
}
]
}
]
}
And here's what I'm trying to get to:
{
"matchup":[
{
"id":"111222",
"options":[
{
"name":"111",
"playerid":"111"
},
{
"name":"222",
"playerid":"222"
}
]
}
]
}
I'd like to follow best practices as well as structure this appropriately, if there's a better way to go about this, please let me know!

Answer 1

You need to store $attachment['matchupID'] as an array key of $data:
$data = array();
while ($attachment = $db->fetch_array($attachments)){
if (!isset($data[$attachment['matchupID']])) {
$data[$attachment['matchupID']] = array (
'id' => $attachment['matchupID'],
'options' => array()
);
}
$data[$attachment['matchupID']]['options'][] = array (
"name" => $attachment['player_name'],
"playerid" => $attachment['player_id']
);
}
// use `array_values` to reindex `$data`
$data = array("matchup" => array_values($data));
print json_encode($data);