SQL - Separate results by associated vale? - php

Question

Before anything, I'll show you my table:
(In the context of PHP)
I'd like to create a multidimensional array via a query - So that a group of tags with the same id will end up in the same place:
<?php
// Given the above example table, it would essentially produce this:
$my_1 = array
( array('ect'),
array('123', 'tag'),
array('lolly', 'hat')
);
Is that a possibility? I've achieved the same result by looping through queries, but it's terribly inefficient.

Answer 1

<?php
$array = array();
foreach($tags as $tag)
{
if(array_key_exist($tag->id,$array)){
//if key is assigned in array, we can push value to key
$array[$tag->id] = array_push($tag->value,$array[$tag->id]);
}else{
//if key is not assigned we will create key and push value
$array[$tag->id] = $tag->value;
}
}
//usage
print_r($array[7]); // list tags with id 7
?>

Answer 2

Use a 2-dimensional array:
$array = array();
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
$id = $row['id'];
$tag = $row['tag'];
if (isset($array[$id])) {
$array[$id][] = $tag;
} else {
$array[$id] = array($tag);
}
}
The resulting $array will be
array(1 => array('ect'),
7 => array('123', 'tag'),
9 => array('lolly', 'hat'))