multidimensional array sort by giver key. ordenar array multidimensional por una clave dada.

multidimensional array sort.php

<?php 
$people = array( 
	array("name"=>"Bob","age"=>8,"colour"=>"red"), 
	array("name"=>"Greg","age"=>12,"colour"=>"blue"), 
	array("name"=>"Andy","age"=>5,"colour"=>"purple")
); 

var_dump($people); 

$sortArray = array(); 

foreach($people as $person){ 
    foreach($person as $key=>$value){ 
        if(!isset($sortArray[$key])){ 
            $sortArray[$key] = array(); 
        } 
        $sortArray[$key][] = $value; 
    } 
} 

$orderby = "name"; //change this to whatever key you want from the array 

array_multisort($sortArray[$orderby],SORT_DESC,$people); 

var_dump($people); 


/*Function - Función*/
function array_sortByGivebKey($array, $orderby, $desc=false) {

  $sortArray = array(); 

  $orden = $desc==true ? SORT_DESC : SORT_ASC;

  foreach($array as $arr){ 
    foreach($arr as $key=>$value){ 
        if(!isset($sortArray[$key])){ 
            $sortArray[$key] = array(); 
        } 
        $sortArray[$key][] = $value; 
    } 
  } 
 
  array_multisort($sortArray[$orderby],$orden,$array); 
  return $array;
}
/*Another way - Otra forma*/
function sortByField($multArray,$sortField,$desc=false){
  $tmpKey='';
  $ResArray=array();

  $maIndex=array_keys($multArray);
  $maSize=count($multArray)-1;

  for($i=0; $i < $maSize ; $i++) {

     $minElement=$i;
     $tempMin=$multArray[$maIndex[$i]][$sortField];
     $tmpKey=$maIndex[$i];

      for($j=$i+1; $j <= $maSize; $j++)
        if($multArray[$maIndex[$j]][$sortField] < $tempMin ) {
           $minElement=$j;
           $tmpKey=$maIndex[$j];
           $tempMin=$multArray[$maIndex[$j]][$sortField];

        }
        $maIndex[$minElement]=$maIndex[$i];
        $maIndex[$i]=$tmpKey;
  }

  if($desc)
     for($j=0;$j<=$maSize;$j++)
        $ResArray[$maIndex[$j]]=$multArray[$maIndex[$j]];
  else
    for($j=$maSize;$j>=0;$j--)
        $ResArray[$maIndex[$j]]=$multArray[$maIndex[$j]];

  return $ResArray;
}









?>