PHP create arrays from array

Question

I have two tables, content and theme. There are several theme rows that should be obtained for each row in the content table. This I have done with PDO and a mySQL query involving a LEFT JOIN. The output array gives me one array per occurence of a theme file (below).

I want to reorganise the array so that I get one array per contentID with an array within that array containing each of the matching theme files.

The idea being that something like $content=>'theme'['logo'] would grab the value for one of the matching theme files.

How would this be done.

array(
       array (
            contentID => 1, 
            title => 'test', 
            subtitle = 'a description', 
            themeID => 1,
            theme_file => 'navigation'
        )

        array (
            contentID => 1, 
            title => 'test', 
            subtitle = 'a description', 
            themeID => 2,
            theme_file => 'logo'
        )
)

As requested I have added additional code. There are in fact 3 tables I wish to nest inside each other but for the purpose of a helpful question to others I kept it at 2. This is the mySQL query if helpful:

SELECT * 
FROM content
LEFT JOIN content_theme ON content.contentID = content_theme.contentID
LEFT JOIN theme ON theme.themeID = content_theme.themeID
OR theme.default =1
LEFT JOIN theme_meta ON theme.themeID = theme_meta.themeID
WHERE content.contentID = 9
ORDER BY theme.default DESC 

The intention therefore is to for each content row to nest all its matching theme rows, and for each of these theme rows to nest each of their matching theme_meta rows

Raw output from the database:

Array
(
    [0] => Array
        (
            [contentID] => 
            [0] => 4
            [type] => page
            [1] => page
            [type_alts] => 
            [2] => 
            [url] => about
            [3] => about
            [title] => About
            [4] => About
            [subtitle] => 
            [5] => 
            [online] => 1
            [6] => 1
            [req] => 0
            [7] => 0
            [pos] => 0
            [8] => 0
            [parent] => 0
            [9] => 0
            [content_theme_ID] => 
            [10] => 
            [11] => 
            [themeID] => 2
            [12] => 
            [13] => 2
            [theme_type] => general
            [14] => general
            [theme_file] => logo
            [15] => logo
            [theme_default] => 1
            [16] => 1
            [theme_title] => MD Group
            [17] => MD Group
            [18] => 2
            [field] => src
            [19] => src
            [value] => uploads/img/murphey-dines-group-logo.png
            [20] => uploads/img/murphey-dines-group-logo.png
        )

    [1] => Array
        (
            [contentID] => 
            [0] => 4
            [type] => page
            [1] => page
            [type_alts] => 
            [2] => 
            [url] => about
            [3] => about
            [title] => About
            [4] => About
            [subtitle] => 
            [5] => 
            [online] => 1
            [6] => 1
            [req] => 0
            [7] => 0
            [pos] => 0
            [8] => 0
            [parent] => 0
            [9] => 0
            [content_theme_ID] => 
            [10] => 
            [11] => 
            [themeID] => 2
            [12] => 
            [13] => 2
            [theme_type] => general
            [14] => general
            [theme_file] => logo
            [15] => logo
            [theme_default] => 1
            [16] => 1
            [theme_title] => MD Group
            [17] => MD Group
            [18] => 2
            [field] => title
            [19] => title
            [value] => murphey dines Group
            [20] => murphey dines Group
        )

    [2] => Array
        (
            [contentID] => 
            [0] => 4
            [type] => page
            [1] => page
            [type_alts] => 
            [2] => 
            [url] => about
            [3] => about
            [title] => About
            [4] => About
            [subtitle] => 
            [5] => 
            [online] => 1
            [6] => 1
            [req] => 0
            [7] => 0
            [pos] => 0
            [8] => 0
            [parent] => 0
            [9] => 0
            [content_theme_ID] => 
            [10] => 
            [11] => 
            [themeID] => 
            [12] => 
            [13] => 7
            [theme_type] => general
            [14] => general
            [theme_file] => navigation
            [15] => navigation
            [theme_default] => 1
            [16] => 1
            [theme_title] => Main Navigation
            [17] => Main Navigation
            [18] => 
            [field] => 
            [19] => 
            [value] => 
            [20] => 
        )

)

Answer 1

You can nest the arrays like this i suppose.

$aContent = array();
foreach($aRows AS $aRow){
    $aContent[$aRow['contentID']][] = array(
        'theme' => array(
            'themeID' => $aRow['themeID'],
            'themeType' => $aRow['theme_type'],
            'themeTitle' => $aRow['theme_title']
        ),
        'type' => 'page',
    );
}