Merging two-dimensional arrays

Array A before merging:

array (size=3)  0 =>     array (size=2)      'id' => string '113' (length=3)      'email' => string 'yintx_1292342352@163.com' (length=24)      1 =>     array (size=2)      'id' => string '111' (length=3)      'email' => string 'yintx_1293456456@163.com' (length=24)  2 =>     array (size=2)      'id' => string '109' (length=3)      'email' => string 'yintx_129@99999.com' (length=19)

Array B before merging:

array (size=2)  0 =>     array (size=2)      'user_id' => string '113' (length=2)      'count' => string '1' (length=1)  1 =>     array (size=2)      'user_id' => string '109' (length=2)      'count' => string '8' (length=1)

Merged Array (merge condition, id==b of a, user_id when merged ):

array (size=3)  0 =>     array (size=3)      'id' => string '113' (length=3)      'email' => string 'yintx_1292342352@163.com' (length=24)      'count' => string '1' (length=1)      1 =>     array (size=3)      'id' => string '111' (length=3)      'email' => string 'yintx_1293456456@163.com' (length=24)      'count' => string '0' (length=1)  2 =>     array (size=3)      'id' => string '109' (length=3)      'email' => string 'yintx_129@99999.com' (length=19)      'count' => string '8' (length=1)

Reply content:

Array A before merging:

array (size=3)  0 =>     array (size=2)      'id' => string '113' (length=3)      'email' => string 'yintx_1292342352@163.com' (length=24)      1 =>     array (size=2)      'id' => string '111' (length=3)      'email' => string 'yintx_1293456456@163.com' (length=24)  2 =>     array (size=2)      'id' => string '109' (length=3)      'email' => string 'yintx_129@99999.com' (length=19)

Array B before merging:

array (size=2)  0 =>     array (size=2)      'user_id' => string '113' (length=2)      'count' => string '1' (length=1)  1 =>     array (size=2)      'user_id' => string '109' (length=2)      'count' => string '8' (length=1)

Merged Array (merge condition, id==b of a, user_id when merged ):

array (size=3)  0 =>     array (size=3)      'id' => string '113' (length=3)      'email' => string 'yintx_1292342352@163.com' (length=24)      'count' => string '1' (length=1)      1 =>     array (size=3)      'id' => string '111' (length=3)      'email' => string 'yintx_1293456456@163.com' (length=24)      'count' => string '0' (length=1)  2 =>     array (size=3)      'id' => string '109' (length=3)      'email' => string 'yintx_129@99999.com' (length=19)      'count' => string '8' (length=1)

The array_merge_recursive () function, like the Array_merge () function, merges the elements of one or more arrays and appends the values in an array to the previous array. and returns an array as the result.
However, unlike Array_merge (), when there are duplicate key names, the values are not overwritten, but the values of multiple identical key names are recursively grouped into an array. (see Example 1)

$a 1=array ("a" = "Horse", "b" = "Dog");
$a 2=array ("c" = "Cow", "b" = "Cat");
Print_r (array_merge_recursive ($a 1, $a 2));
?>
Output:
Array (
[A] = Horse
[b] = = Array ([0] = Dog [1] = Cat)
[C] = Cow
)

$a = array (' id ' = ' 113 ', ' email ' = ' yintx_1292342352@163.com '), array (' id ' = ' 111 ', ' email ' = ' = ' yintx_ 1293456456@163.com '), array (' id ' = ' 109 ', ' email ' = ' yintx_129@99999.com ')); $b = Array (' user_id ' = ' 113 ', ' count ' = ' 1 '), Array (' user_id ' = ' 109 ', ' count ' = ' 8 ')), foreach ($a as $ka = $va) {foreach ($b as $        Kb=> $vb) {if ($va [' id '] = = $vb [' user_id ']) {$a [$ka] [' count '] = $vb [' count ']; }}}var_dump ($a);----------Array (size=3) 0 = = Array (size=3) ' id ' = = String ' 113 ' (length=3) ' EMA Il ' = = string ' yintx_1292342352@163.com ' (length=24) ' count ' = = String ' 1 ' (length=1) 1 = = Array (size= 2) ' id ' = = String ' 111 ' (length=3) ' email ' = = String ' yintx_1293456456@163.com ' (length=24) 2 = a Rray (size=3) ' id ' = = String ' 109 ' (length=3) ' email ' = = String ' yintx_129@99999.com ' (length=19) ' Co Unt ' = = String ' 8 ' (length=1)

Array_merge_recursive ($a, $b);

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