Php calculates the total number of equal values in a two-dimensional array and combines them into a new array-php Tutorial

Php calculates the total number of equal values in a two-dimensional array and combines them into a new array. for example, I want to & nbsp; m_id & nbsp; the equal array elements are combined into a new array: php? Multi-dimensional array? Php calculates the total number of equal values in a two-dimensional array and combines them into a new array.

For example, I want to combine the m_id equivalent array elements in this array into a new array:

Php? Multi-dimensional array?

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------ Solution --------------------

 $ Arr = array (
Array (
'Sv _ id' => 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)
------ Solution --------------------
! 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 can copy and run it to see if it is the effect you want.
:




------ Solution --------------------
Don't consider your extra projects (I can't guess)
$ar = array(
  array( 'sv_id' => 1, 'mid' => 1, 'sv_question1' => 20 ),
  array( 'sv_id' => 2, 'mid' => 2, 'sv_question1' => 10 ),
  array( 'sv_id' => 3, 'mid' => 1, 'sv_question1' => 20 ),
  array( 'sv_id' => 4, 'mid' => 3, 'sv_question1' => 20 ),
  array( 'sv_id' => 5, 'mid' => 2, 'sv_question1' => 20 ),
);
$res = array();

foreach($ar as $item) {
  $res[$item['mid']][$item['sv_id']] = $item;