PHP two-dimensional array sorting array_multisort

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For 2-dimensional arrays or multi-dimensional arrays Sorting is a common problem. In PHP, we have a special multi-dimensional array sorting function. Here is a brief introduction:

array_multisort(array1,sorting order, sorting type,array2,array3..） 是对多个数组或多维数组进行排序的函数。

#The array in the parameter is treated as a table column and sorted by row - this is similar to the functionality of SQL's ORDER BY clause. The first array is the main array to be sorted. If the rows (values) in the array compare to be the same, they will be sorted according to the size of the corresponding value in the next input array, and so on.
The first parameter is an array, and each subsequent parameter may be an array or one of the following sort order flags (the sorting flag is used to change the default sort order):
SORT_ASC - Default, in ascending order arrangement. (A-Z)
SORT_DESC - Sort in descending order. (Z-A)
You can then specify the type of sort:
SORT_REGULAR - Default. Arrange each item in regular order.
SORT_NUMERIC - Sort each item in numerical order.

SORT_STRING - Arrange each item in alphabetical order

1,'name'=>'fj','weight'=>100,'height'=>180), 
                    array('id'=>2,'name'=>'tom','weight'=>53,'height'=>150), 
                    array('id'=>3,'name'=>'jerry','weight'=>120,'height'=>156), 
                    array('id'=>4,'name'=>'bill','weight'=>110,'height'=>190), 
                    array('id'=>5,'name'=>'linken','weight'=>80,'height'=>200), 
                    array('id'=>6,'name'=>'madana','weight'=>95,'height'=>110), 
                    array('id'=>7,'name'=>'jordan','weight'=>70,'height'=>170) 
                ); 
       
    var_dump($person); 
       
    $person = my_sort($person,'name',SORT_ASC,SORT_STRING); 
   
    var_dump($person); 
       
    $person = my_sort($person,'weight'); 
   
    var_dump($person); 
?>

The result is as follows:

array (size=7)
  0 =>
    array (size=4)
      'id' => int 1
      'name' => string 'fj' (length=2)
      'weight' => int 100
      'height' => int 180
  1 =>
    array (size=4)
      'id' => int 2
      'name' => string 'tom' (length=3)
      'weight' => int 53
      'height' => int 150
  2 =>
    array (size=4)
      'id' => int 3
      'name' => string 'jerry' (length=5)
      'weight' => int 120
      'height' => int 156
  3 =>
    array (size=4)
      'id' => int 4
      'name' => string 'bill' (length=4)
      'weight' => int 110
      'height' => int 190
  4 =>
    array (size=4)
      'id' => int 5
      'name' => string 'linken' (length=6)
      'weight' => int 80
      'height' => int 200
  5 =>
    array (size=4)
      'id' => int 6
      'name' => string 'madana' (length=6)
      'weight' => int 95
      'height' => int 110
  6 =>
    array (size=4)
      'id' => int 7
      'name' => string 'jordan' (length=6)
      'weight' => int 70
      'height' => int 170
array (size=7)
  0 =>
    array (size=4)
      'id' => int 4
      'name' => string 'bill' (length=4)
      'weight' => int 110
      'height' => int 190
  1 =>
    array (size=4)
      'id' => int 1
      'name' => string 'fj' (length=2)
      'weight' => int 100
      'height' => int 180
  2 =>
    array (size=4)
      'id' => int 3
      'name' => string 'jerry' (length=5)
      'weight' => int 120
      'height' => int 156
  3 =>
    array (size=4)
      'id' => int 7
      'name' => string 'jordan' (length=6)
      'weight' => int 70
      'height' => int 170
  4 =>
    array (size=4)
      'id' => int 5
      'name' => string 'linken' (length=6)
      'weight' => int 80
      'height' => int 200
  5 =>
    array (size=4)
      'id' => int 6
      'name' => string 'madana' (length=6)
      'weight' => int 95
      'height' => int 110
  6 =>
    array (size=4)
      'id' => int 2
      'name' => string 'tom' (length=3)
      'weight' => int 53
      'height' => int 150
array (size=7)
  0 =>
    array (size=4)
      'id' => int 2
      'name' => string 'tom' (length=3)
      'weight' => int 53
      'height' => int 150
  1 =>
    array (size=4)
      'id' => int 7
      'name' => string 'jordan' (length=6)
      'weight' => int 70
      'height' => int 170
  2 =>
    array (size=4)
      'id' => int 5
      'name' => string 'linken' (length=6)
      'weight' => int 80
      'height' => int 200
  3 =>
    array (size=4)
      'id' => int 6
      'name' => string 'madana' (length=6)
      'weight' => int 95
      'height' => int 110
  4 =>
    array (size=4)
      'id' => int 1
      'name' => string 'fj' (length=2)
      'weight' => int 100
      'height' => int 180
  5 =>
    array (size=4)
      'id' => int 4
      'name' => string 'bill' (length=4)
      'weight' => int 110
      'height' => int 190
  6 =>
    array (size=4)
      'id' => int 3
      'name' => string 'jerry' (length=5)
      'weight' => int 120
      'height' => int 156

The key point here is to first save the keys to be sorted into a one-dimensional array , and then you can use the array_multisort() function to sort the array according to key. Of course, you don’t need to use the array_multisort() function for sorting here. This effect can also be achieved only through foreach traversal, but since PHP development If the author provides us with a better way, we can save ourselves unnecessary trouble.

Reprinted from:https://www.cnblogs.com/tdalcn/p/6420055.html

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