PHP counts the total number of equal values in a two-dimensional array and combines them into a new array

PHP Multidimensional arrays

For example, I would like to combine the elements of this array into a new array of m_id equal arrays: The following:

Reply to discussion (solution)

For example, you have to justify it, or it will cause misunderstanding.

The original data does not:
' sv_id ' = 5, ' mid ' + 0
' sv_id ' = 9, ' Mid ' + 3
, how did the results come out?

For example, you have to justify it, or it will cause misunderstanding.

The original data does not:
' sv_id ' = 5, ' mid ' + 0
' sv_id ' = 9, ' Mid ' + 3
, how did the results come out?

Well, yes, but the data can be changed casually ah, take a good look at the two graphs of the array structure it ...

This structure doesn't matter, does it?
From an algorithmic point of view: How to produce items that are not in the original data

 1, ' m_id ' =>1, ' Sv_question1 ' =>20), array (' sv_id ' =>2, ' m_id ' =>2, ' Sv_question1 ' =>10), array (' sv_id ' = >3, ' m_id ' =>1, ' Sv_question1 ' =>20), array (' sv_id ' =>4, ' m_id ' =>3, ' Sv_question1 ' =>20), array (' Sv_ Id ' =>5, ' m_id ' =>2, ' Sv_question1 ' =>10);//var_dump ($arr); $ar =array (); foreach ($arr as $v) {if (empty ($ar) | | | In_array ($v, $ar)) {$ar [$v [' m_id ']][$v [' sv_id ']]= $v;} Else{foreach ($ar as $ka = $va) {if ($ka = = $v [' m_id ']) {$ar [$ka] [$v [' sv_id ']]= $v;}}} echo "
"; Var_dump ($ar);
  
You copy run to see if you want the effect.
：
  
  
  
 
 
Don't consider your extra items (I can't figment)
 $ar = Array (' sv_id ' = = 1, ' mid ' = + 1, ' sv_question1 ' = =), Array (' s v_id ' + 2, ' mid ' and ' 2 ', ' sv_question1 ', ' + ', Array (' sv_id ' = 3, ' mid ' = 1, ' sv_question1 ' + 20) , Array (' sv_id ' = 4, ' mid ' = + 3, ' sv_question1 ' = ' = '), array (' sv_id ' = 5, ' mid ' = + 2, ' Sv_question1 ' = = '), $res = Array (), foreach ($ar as $item) {$res [$item [' Mid ']][$item [' sv_id '] = $item;} Print_r ($res); 
  
Array ([1] = = Array ([1] = = Array ([sv_id] = 1                [Mid] = 1 [Sv_question1] = [3] = = Array                ([sv_id] = 3 [Mid] = 1 [sv_question1] 20 )) [2] = = Array ([2] = = Array ([sv_id] = > 2 [mid] = 2 [Sv_question1] [5] = A Rray ([sv_id] = 5 [Mid] = 2 [sv_question1                    ] = [3] = = Array ([4] = = Array (        [SV_ID] = 4 [Mid] = 3 [Sv_question1] + 20) ))
 
 
Wow, #5版主, why can't I think of your way of writing? Your good is concise.
 
  
  1, ' m_id ' =>1, ' Sv_question1 ' =>20), array (' sv_id ' =>2, ' m_id ' =>2, ' Sv_question1 ' =>10), array (' sv_id ' = >3, ' m_id ' =>1, ' Sv_question1 ' =>20), array (' sv_id ' =>4, ' m_id ' =>3, ' Sv_question1 ' =>20), array (' Sv_ Id ' =>5, ' m_id ' =>2, ' Sv_question1 ' =>10);//var_dump ($arr); $ar =array (); foreach ($arr as $v) {if (empty ($ar) | | | In_array ($v, $ar)) {$ar [$v [' m_id ']][$v [' sv_id ']]= $v;} Else{foreach ($ar as $ka = $va) {if ($ka = = $v [' m_id ']) {$ar [$ka] [$v [' sv_id ']]= $v;}}} echo "
"; Var_dump ($ar);
  
You copy run to see if you want the effect.
：
  
  
  
Well, this way can, thanks, but the following big God is more scary, too simple!!!
 
Don't consider your extra items (I can't figment)
$ar = Array ('  sv_id ' = = 1, ' mid ' = = 1, ' sv_question1 ' = ' = '),  array (' sv_id ' = 2, ' mid ' = +) 2, ' sv_question1 ' = +,  array (' sv_id ' = + 3, ' mid ' = 1, ' sv_question1 ', ' = '),  array (' sv_id ' =& Gt  4, ' mid ' = + 3, ' sv_question1 ', ' = ', '  array ' (' sv_id ' = 5, ' mid ' = 2, ' sv_question1 ', ' = ') '; $res = Array (); foreach ($ar as $item) {  $res [$item [' Mid ']][$item [' sv_id '] = $item;} Print_r ($res);
  
Array ([1] = = Array ([1] = = Array ([sv_id] = 1                [Mid] = 1 [Sv_question1] = [3] = = Array                ([sv_id] = 3 [Mid] = 1 [sv_question1] 20 )) [2] = = Array ([2] = = Array ([sv_id] = > 2 [mid] = 2 [Sv_question1] [5] = A Rray ([sv_id] = 5 [Mid] = 2 [sv_question1                    ] = [3] = = Array ([4] = = Array (        [SV_ID] = 4 [Mid] = 3 [Sv_question1] + 20) ))
  
  
  
Too cow!!! Worship Thank you!!
 
This structure doesn't matter, does it?
From an algorithmic point of view: How to produce items that are not in the original data
  
Well, yes, sorry I wrote it wrong, one less underline m_id written in mid
 
  
  
   1, ' m_id ' =>1, ' Sv_question1 ' =>20), array (' sv_id ' =>2, ' m_id ' =>2, ' Sv_question1 ' =>10), array (' sv_id ' = >3, ' m_id ' =>1, ' Sv_question1 ' =>20), array (' sv_id ' =>4, ' m_id ' =>3, ' Sv_question1 ' =>20), array (' Sv_ Id ' =>5, ' m_id ' =>2, ' Sv_question1 ' =>10);//var_dump ($arr); $ar =array (); foreach ($arr as $v) {if (empty ($ar) | | | In_array ($v, $ar)) {$ar [$v [' m_id ']][$v [' sv_id ']]= $v;} Else{foreach ($ar as $ka = $va) {if ($ka = = $v [' m_id ']) {$ar [$ka] [$v [' sv_id ']]= $v;}}} echo "
"; Var_dump ($ar);
  
You copy run to see if you want the effect.
：
  
  
  
Well, this way can, thanks, but the following big God is more scary, too simple!!!
 
  
  
  
 
     1, ' m_id ' =>1, ' Sv_question1 ' =>20), array (' sv_id ' =>2, ' m_id ' =>2, ' Sv_question1 ' =>10), array (' sv_id ' = >3, ' m_id ' =>1, ' Sv_question1 ' =>20), array (' sv_id ' =>4, ' m_id ' =>3, ' Sv_question1 ' =>20), array (' Sv_ Id ' =>5, ' m_id ' =>2, ' Sv_question1 ' =>10);//var_dump ($arr); $ar =array (); foreach ($arr as $v) {if (empty ($ar) | | | In_array ($v, $ar)) {$ar [$v [' m_id ']][$v [' sv_id ']]= $v;} Else{foreach ($ar as $ka = $va) {if ($ka = = $v [' m_id ']) {$ar [$ka] [$v [' sv_id ']]= $v;}}} echo "
"; Var_dump ($ar);
  
You copy run to see if you want the effect.  
：  
  
  
  
Well, this way can, thanks, but the following big God is more scary, too simple!!!
