creating a multidimensional array from queries - php

Question

I'm having difficulty constructing a multidimensional array based on queries fetched from a mysql database. The purpose is to prepare the result for json encoding. Having problems here.
Structure I’m aiming for:
Array (
[68] => Array (
[0] => Array (
[id] => 64
[description] => yada, yada, yada... )
[1] => Array (
[id] => 65
[description] => yada, yada, yada...)
[2] => Array (
[id] => 66
[description] => yada, yada, yada... ) )
[69] => Array (
[0] => Array (
[id] => 64
[description] => yada, yada, yada... )
[1] => Array (
[id] => 65
[description] => yada, yada, yada...)
[2] => Array (
[id] => 66
[description] => yada, yada, yada... ) )
...etc
)
From:
//this is a list of unknown length
$array_ids = (68, 69, 70, etc... ); // or:
Array (
[0] => 68
[1] => 69
[2] => 70
[3] => 71
etc..
)
//this is a known length
$array_contents = ( array ( array ( [id], [description]) ); // or:
Array (
[0] => Array (
[id] => 64
[description] =>yada, yada, yada... )
[1] => Array (
[id] => 65
[description] => yada, yada, yada... )
[2] => Array (
[id] => 66
[description] => yada, yada, yada... ) )
My attempt:
foreach($array_ids as $row){
$result = array($row=>array());
foreach($array_contents as $key => $value){
$result [$row][$key] = $value;
}
}
Result:
Array (
[68] => Array (
[0] => Array (
[id] => 64
[description] => yada, yada, yada... )
[1] => Array (
[id] => 65
[description] => yada, yada, yada...)
[2] => Array (
[id] => 66
[description] => yada, yada, yada... ) )
)
...and that’s where it stops. It doesn’t go on to the next row id of 69, 70, etc...
What am I doing wrong?

Answer 1

This line seems to be the problem:
$result = array($row=>array());
Every pass through $array_ids it's completely wiping out $result and repopulating it with one single item from $array_contents, rather than appending it to the end.
Replacing it with this should work:
$result[$row] = array();
Here's a full working version:
$array_ids = array(68,69,70);
$array_contents = array(
array(
'id' => 64,
'description' => 'yada, yada, yada...'
),
array(
'id' => 65,
'description' => 'yada, yada, yada2...'
),
array(
'id' => 66,
'description' => 'yada, yada, yada3...'
),
);
foreach($array_ids as $row){
$result[$row] = array();
foreach($array_contents as $key => $value){
$result [$row][$key] = $value;
}
}
var_dump($result);
?>
Here's the output:
array(3) {
[68]=>
array(3) {
[0]=>
array(2) {
["id"]=>
int(64)
["description"]=>
string(19) "yada, yada, yada..."
}
[1]=>
array(2) {
["id"]=>
int(65)
["description"]=>
string(20) "yada, yada, yada2..."
}
[2]=>
array(2) {
["id"]=>
int(66)
["description"]=>
string(20) "yada, yada, yada3..."
}
}
[69]=>
array(3) {
[0]=>
array(2) {
["id"]=>
int(64)
["description"]=>
string(19) "yada, yada, yada..."
}
[1]=>
array(2) {
["id"]=>
int(65)
["description"]=>
string(20) "yada, yada, yada2..."
}
[2]=>
array(2) {
["id"]=>
int(66)
["description"]=>
string(20) "yada, yada, yada3..."
}
}
[70]=>
array(3) {
[0]=>
array(2) {
["id"]=>
int(64)
["description"]=>
string(19) "yada, yada, yada..."
}
[1]=>
array(2) {
["id"]=>
int(65)
["description"]=>
string(20) "yada, yada, yada2..."
}
[2]=>
array(2) {
["id"]=>
int(66)
["description"]=>
string(20) "yada, yada, yada3..."
}
}
}

Answer 2

I tried with following array structure and logic its working , My logic is bit different
$array = array(68,69,70);
$nextArray = array(
array(
'id'=>64,
'desc'=>'test'
),
array(
'id'=>65,
'desc'=>'test'
),
array(
'id'=>66,
'desc'=>'test'
),
array(
'id'=>67,
'desc'=>'test'
),
);
$tempArray = array();
foreach($array as $value){
foreach($nextArray as $key => $value1){
$tempArray[$value][$key] = $value1;
}
}
var_dump($tempArray);
output :
array
68 =>
array
0 =>
array
'id' => int 64
'desc' => string 'test' (length=4)
1 =>
array
'id' => int 65
'desc' => string 'test' (length=4)
2 =>
array
'id' => int 66
'desc' => string 'test' (length=4)
3 =>
array
'id' => int 67
'desc' => string 'test' (length=4)
69 =>
array
0 =>
array
'id' => int 64
'desc' => string 'test' (length=4)
1 =>
array
'id' => int 65
'desc' => string 'test' (length=4)
2 =>
array
'id' => int 66
'desc' => string 'test' (length=4)
3 =>
array
'id' => int 67
'desc' => string 'test' (length=4)
70 =>
array
0 =>
array
'id' => int 64
'desc' => string 'test' (length=4)
1 =>
array
'id' => int 65
'desc' => string 'test' (length=4)
2 =>
array
'id' => int 66
'desc' => string 'test' (length=4)
3 =>
array
'id' => int 67
'desc' => string 'test' (length=4)

Answer 3

Try to change your code following way & shorter
$result = array();
foreach($array_ids as $row){
foreach($array_contents as $key => $value){
$result [$row][$key] = $value;
}
}

Answer 4

OK, having re-read the question, try the following:
$outputArray = array();
foreach( $array_ids as $id ){
$outputArray[$id] = $array_contents;
}