PHP-implemented custom array sort functions and sort class examples _php tips

This article illustrates the custom array sort functions and sorting classes implemented by PHP. Share to everyone for your reference, specific as follows:

*
* * Two-dimensional array custom sort function
* Uasort ($arr, function_name)
*
**/
$arr = array (
  array (' A ' =>1, ' B ' => ' C '),
  array (' A ' =>4, ' B ' => ' a '),
  array (' A ' =>5, ' B ' => ' G '),
  array (' A ' =>7, ' B ' => ' F '),
  Array (' A ' =>6, ' B ' => ' e ')
);
function Compare_arr ($x, $y) {
  if ($x [' B ']< $y [' B ']) {
    return-1;
  } else if ($x [' B ']> $y [' B ']) {return
    1;
  } else{return
    0;
  }
Uasort ($arr, ' Compare_arr ');
foreach ($arr as $a) {
  echo $a [' a ']. ' => '. $a [' B ']. ' <br/> ';
}

Custom sort classes in the manual:

 class Multisort {var $key; The key in your array//Sort function argument is an array to arrange the index sort type functions run ($myarray, $key _to_sort, $type _of_sort = ") {$
     This->key = $key _to_sort;
     if ($type _of_sort = = ' desc ') uasort ($myarray, Array ($this, ' myreverse_compare '));
     else Uasort ($myarray, Array ($this, ' mycompare '));
   return $myarray;
     }//Positive sequence function Mycompare ($x, $y) {if ($x [$this->key] = = $y [$this->key]) return 0;
     else if ($x [$this->key] < $y [$this->key]) return-1;
   else return 1;
     //Reverse function Myreverse_compare ($x, $y) {if ($x [$this->key] = = $y [$this->key]) return 0;
     else if ($x [$this->key] > $y [$this->key]) return-1;
   else return 1; }
}

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I hope this article will help you with the PHP program design.