Sql statement into an array causing duplicates - php

Question

this is my first time using the site. I need some help. When I run this code and get the output I get duplicated lines of data. So for instance a member maybe on the list 3 - 4 times depending on how many years he has gone to the events. I need to somehow combine any similar data into one row, if that makes sense? So John Doe should not be on the list 7 times just once with all the years he has gone.
$query_mem = "SELECT m.id, m.prefix, m.first_name, m.middle_name, m.last_name, m.suffix, m.member_class, m.jurisdiction_associated,
event.year,
m_event.attend
FROM members AS m, event AS event, members_event AS m_event $where
AND m.member_class IN (1,3)
AND m.id = m_event.codigo_usuario AND m_event.type_event = event.codigo_inscricao
ORDER BY event.year, m.jurisdiction_associated, m.last_name, m.first_name";
$retorno_mem = $conexao->query($query_mem);
if(($conexao->errorCode() == '0') && ($retorno_mem->rowCount() > 0))
{
while($registros_mem = $retorno_mem->fetch(PDO::FETCH_ASSOC))
{
$prefix=$fname=$mname=$lname=$suffix=$address_1=$address_2=$city=$state=$zip=$country=$org=$campaign=NULL;
$member_id = ($registros_mem["id"]);
$prefix = ($registros_mem["prefix"]);
$fname = ($registros_mem["first_name"]);
$mname = ($registros_mem["middle_name"]);
$lname = ($registros_mem["last_name"]);
$suffix = ($registros_mem["suffix"]);
$class = getMemberClassName($conexao,$registros_mem["member_class"]);
$jurisdiction = getJurisdictionName($conexao,$registros_mem["jurisdiction_associated"]."000");
$year = ($registros_mem["year"]);
$attendance = getMemberAttendanceName($conexao,$registros_mem["attend"]);
$data1[] = array(
''.utf8_encode((int)$member_id).'',
''.utf8_encode($prefix).'',
''.utf8_encode($fname).'',
''.utf8_encode($mname).'',
''.utf8_encode($lname).'',
''.utf8_encode($suffix).'',
''.utf8_encode($class).'',
''.utf8_encode($jurisdiction).'',
''.utf8_encode($year).'',
''.utf8_encode($attendance).'',
);
}
}

Answer 1

You can use the member's ID as the array key to see if he's already been, and if so just add to the year field. Something like this:
while($registros_mem = $retorno_mem->fetch(PDO::FETCH_ASSOC))
{
if ( ! array_key_exists( $registros_mem['id'], $data1)
{
// We need to make year an array so it can hold multiple years.
$registros_mem['year'] = [$registros_mem['year']];
$data1[$registros_mem['id']] = $registros_mem;
} else {
$data1[$registros_mem['id']]['year'][] = $registros_mem['year'];
}
}