Hi, I am trying to loop through some data from my database but it is outputting it twice.

$fields = 'field1, field2, field3, field4';
$idFields = 'id_field1, id_field2, id_field3, id_field4';
$tables = 'table1, table2, table3, table4';
$table = explode(', ', $tables);
$field = explode(', ', $fields);
$id = explode(', ', $idFields);
$str = 'Egg';

$i=1;

while ($i<4) {  
    $f = $field[$i];
    $idd = $id[$i];
    $sql = $writeConn->select()->from($table[$i], array($f, $idd))->where($f . " LIKE ?", '%' . $str . '%');
    $string = '<a title="' . $str . '" href="' . $currentProductUrl . '">' . $str . '</a>';
    $result = $writeConn->fetchAssoc($sql); 

        foreach ($result as $row) {
            echo 'Success! Found ' . $str . ' in ' . $f . '. ID: ' . $row[$idd] . '.<br>';
        }
    $i++;
}

Outputting:

Success! Found Egg in field3. ID: 5.
Success! Found Egg in field3. ID: 5.

Could someone please explain why it is looping through both the indexed and associative values?

UPDATE

I did some more playing around and tried the following.

$fields = 'field1, field2, field3, field4';
$idFields = 'id_field1, id_field2, id_field3, id_field4';
$tables = 'table1, table2, table3, table4';
$table = explode(', ', $tables);
$field = explode(', ', $fields);
$id = explode(', ', $idFields);
$str = 'Egg';

$i=1;

while ($i<4) { 
    $f = $field[$i];
    $idd = $id[$i];
    $sql = $writeConn->select()->from($table[$i], array($f, $idd))->where($f . " LIKE ?", '%' . $str . '%');
    $string = '<a title="' . $str . '" href="' . $currentProductUrl . '">' . $str . '</a>';
    $sth = $writeConn->prepare($sql);
    $sth->execute();
    $result = $sth->fetch(PDO::FETCH_ASSOC);

        foreach ($result as $row) {
            echo 'Success! Found ' . $str . ' in ' . $f . '. ID: ' . $row[$idd] . '.<br>';
        }
    $i++;
}

The interesting thing is that this outputs the below:

Success! Found Egg in field3. ID: E.
Success! Found Egg in field3. ID: E.
Success! Found Egg in field3. ID: 5.
Success! Found Egg in field3. ID: 5.
Success! Found Egg in field3. ID: E.
Success! Found Egg in field3. ID: E.
Success! Found Egg in field3. ID: 5.
Success! Found Egg in field3. ID: 5.

I have also tried adding $i to the output and this outputs 2 as expected. If I change fetch(PDO::FETCH_BOTH) to fetch(PDO::FETCH_ASSOC) the output is as follows:

Success! Found Egg in field3. ID: E.
Success! Found Egg in field3. ID: E.
Success! Found Egg in field3. ID: 5.
Success! Found Egg in field3. ID: 5.

This has been bugging me for too long, so if anyone could help I would be very appreciative!