php - Array reassembly. Need advice?

Question

[0]=>
  array(5) {
    ["id"]=>
    string(1) "2"
    ["title1"]=>
    string(6) "color"
    ["content1"]=>
    string(4) "Red 2"
    ["title2"]=>
    string(6) "size"
    ["content2"]=>
    string(2) "XL"
  }
[1]=>
  array(5) {
    ["id"]=>
    string(1) "1"
    ["title1"]=>
    string(6) "color"
    ["content1"]=>
    string(4) "Red 1"
    ["title2"]=>
    string(6) "size"
    ["content2"]=>
    string(1) "L"
  }
[2]=>
  array(5) {
    ["id"]=>
    string(1) "3"
    ["title1"]=>
    string(6) "color"
    ["content1"]=>
    string(4) "Red 3"
    ["title2"]=>
    string(6) "size"
    ["content2"]=>
    string(3) "XXL"
  }
  
  
  
  
  Assembled like this
       array(5) {
    ["title1"]=>
    string(6) "color"
    ["content1"]=>
            array(5) {
                ["id"]=>
                string(1) "2"
                ["content1"]=>
                string(4) "Red 2"
                   ["id"]=>
                string(1) "1"
                ["content1"]=>
                string(4) "Red 1"
                ["id"]=>
                string(1) "3"
                ["content1"]=>
                string(4) "Red 3"
              }
    ["title2"]=>
    string(6) "size"
    ["content2"]=>
            array(5) {
                ["id"]=>
                string(1) "2"
                ["content2"]=>
                string(4) "XL"
                   ["id"]=>
                string(1) "1"
                ["content2"]=>
                string(4) "L"
                ["id"]=>
                string(1) "3"
                ["content2"]=>
                string(4) "XXL"
              }
  }

Answer 1

There is a problem with the part that the subject wants to assemble. Take content1 as an example:

 ['content1'] => [
        'id'=>2,
        'content1'=>'红2',
        'id'=>1,
        'content1'=>'红1',
        'id'=>3,
        'content1'=>'红3',
    ]

In this way, only the data with id 3 can be retained.
I guess what the questioner needs is this:

 ['content1'] => [
        ['id'=>2,'content1'=>'红2'],
        ['id'=>1,'content1'=>'红1'],
        ['id'=>3,'content1'=>'红3'],
    ]

So, "here comes the most rubbish way of writing in history", I suggest you run the following code yourself.

Original array:

$arr = [
        ['id'=>2,'title1'=>'颜色','content1'=>'红2','title2'=>'尺码','content2'=>'XL'],
        ['id'=>1,'title1'=>'颜色','content1'=>'红1','title2'=>'尺码','content2'=>'L'],
        ['id'=>1,'title1'=>'颜色','content1'=>'红3','title2'=>'尺码','content2'=>'XXL']
    ];

Code I wrote:

$newArr = [];
foreach($arr as $k=>$v)
{
    $keyArr = array_keys($v);
    $valueArr = array_values($v);
    foreach($keyArr as $key=>$val)
    {
        if((strstr($val, 'title') || strstr($val, 'content')) && !array_key_exists($val, $newArr)) 
            $newArr[$val] = strstr($val, 'title') ? $valueArr[$key] : [];

        if(strstr($val, 'content'))
        {
            foreach($arr as $ke=>$va)
            {
                $newArr[$val][$ke]['id'] = $va['id'];
                $newArr[$val][$ke][$val] = $va[$val];
            }
        }
    }
}

I’m not talented, the code is not well written, I hope you can forgive me, please don’t slap me in the face.

Answer 2

How should it be assembled? When I asked a question, you couldn’t explain it clearly

Answer 3

Need group query