Мвссив для Yaml

            $options = array(
                array(
                  'id'=> 9,
                  'name'=>array('photo','for_photos'),
                ),
                array(
                   'id'=> 10,
                   'name'=>array('photo','teaser')
                )
 
            );

<?php
 
$str = "Array (
 [0] =>
 Array (
 [id] => 9 
[name] => photo 
) 
[1] => 
Array ( 
[id] => 9 
[name] => for_photos 
)
 [2] =>
 Array (
 [id] => 10 
[name] => photo 
) 
[3] => 
Array (
 [id] => 10
 [name] => teaser 
) 
)";
 
print_r(print_r_reverse($str));
 
function print_r_reverse($in) {
    $lines = explode("\n", trim($in));
    if (trim($lines[0]) != 'Array') {
        // bottomed out to something that isn't an array
        return $in;
    } else {
        // this is an array, lets parse it
        if (preg_match("/(\s{5,})\(/", $lines[1], $match)) {
            // this is a tested array/recursive call to this function
            // take a set of spaces off the beginning
            $spaces = $match[1];
            $spaces_length = strlen($spaces);
            $lines_total = count($lines);
            for ($i = 0; $i < $lines_total; $i++) {
                if (substr($lines[$i], 0, $spaces_length) == $spaces) {
                    $lines[$i] = substr($lines[$i], $spaces_length);
                }
            }
        }
        array_shift($lines); // Array
        array_shift($lines); // (
        array_pop($lines); // )
        $in = implode("\n", $lines);
        // make sure we only match stuff with 4 preceding spaces (stuff for this array and not a nested one)
        preg_match_all("/^\s{4}\[(.+?)\] \=\> /m", $in, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
        $pos = array();
        $previous_key = '';
        $in_length = strlen($in);
        // store the following in $pos:
        // array with key = key of the parsed array's item
        // value = array(start position in $in, $end position in $in)
        foreach ($matches as $match) {
            $key = $match[1][0];
            $start = $match[0][1] + strlen($match[0][0]);
            $pos[$key] = array($start, $in_length);
            if ($previous_key != '') $pos[$previous_key][1] = $match[0][1] - 1;
            $previous_key = $key;
        }
        $ret = array();
        foreach ($pos as $key => $where) {
            // recursively see if the parsed out value is an array too
            $ret[$key] = print_r_reverse(substr($in, $where[0], $where[1] - $where[0]));
        }
        return $ret;
    }
}

$Arr =[
    ['id'=> 9, 'name' => 'photo'],  
    ['id'=> 9, 'name' => 'for_photos'],  
    ['id'=> 10, 'name' => 'photo'],  
    ['id'=> 10, 'name' => 'teaser'],  
];
$out = [];
while(($a=pos($Arr)) && $b=next($Arr)){
    if($a['id'] != $b['id']){
        trigger_error('Something wrong');
        $out = false;
        break;
    }
    $out[] = ['id'=>$a['id'], 'name' => [$a['name'], $b['name']]];
    next($Arr);
}
reset($Arr);
 
var_export($out);

array (
  0 =>
  array (
    'id' => 9,
    'name' =>
    array (
      0 => 'photo',
      1 => 'for_photos',
    ),
  ),
  1 =>
  array (
    'id' => 10,
    'name' =>
    array (
      0 => 'photo',
      1 => 'teaser',
    ),
  ),
)

$out = [];
foreach($Arr as $a){
    if (!isset($out[$a['id']])) $out[$a['id']] = [];
    $out[$a['id']][] = $a['name'];
}
/*
array (
  9 =>
  array (
    0 => 'photo',
    1 => 'for_photos',
  ),
  10 =>
  array (
    0 => 'photo',
    1 => 'teaser',
  ),
)
*/

function get_i($ar, $id) {
    foreach($ar As $k=>$el){
        if ($el['id'] == $id) return $k;
    }
    return NULL;
}
$out = [];
foreach($Arr as $a){
    $key = get_i($out, $a['id']);
    if (is_null($key)) $out[] = ['id'=>$a['id'], 'name'=>[$a['name']]];
    else $out[$key]['name'][] = $a['name'];
}