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PHP array sorting

PHP

ways.php Raw #

  <?php
  $array = [
              [
                ['name'=>'John B'],
                ['age'=>30],
                ['sizes'=>
                          [
                          'weight'=>80, 
                          'height'=>120
                          ]
                ]
              ],
              [
                ['name'=>'Marie B'],
                ['age'=>31],
                ['sizes'=>
                          [
                          'weight'=>60, 
                          'height'=>110
                          ]
                ]
              ],
              [
                ['name'=>'Carl M'],
                ['age'=>12],
                ['sizes'=>
                          [
                          'weight'=>70, 
                          'height'=>100
                          ]
                ]
              ],
              [
                ['name'=>'Mike N'],
                ['age'=>19],
                ['sizes'=>
                          [
                          'weight'=>70, 
                          'height'=>150
                          ]
                ]
              ],
              [
                ['name'=>'Nancy N'],
                ['age'=>15],
                ['sizes'=>
                          [
                          'weight'=>60, 
                          'height'=>150
                          ]
                ]
              ],
              [
                ['name'=>'Cory X'],
                ['age'=>15],
                ['sizes'=>
                          [
                          'weight'=>44, 
                          'height'=>150
                          ]
                ]
              ]
  ];

  

   //Method1: sorting the array using the usort function and a "callback that you define"
   function method1($a,$b) 
   {
     return ($a[2]["sizes"]["weight"] <= $b[2]["sizes"]["weight"]) ? -1 : 1;
   }
   usort($array, "method1");
   print_r($array);




//Method 2: The bubble method
$j=0;
$flag = true;
$temp=0;

while ( $flag )
{
  $flag = false;
  for( $j=0;  $j < count($array)-1; $j++)
  {
    if ( $array[$j][2]["sizes"]["weight"] > $array[$j+1][2]["sizes"]["weight"] )
    {
      $temp = $array[$j];
      //swap the two between each other
      $array[$j] = $array[$j+1];
      $array[$j+1]=$temp;
      $flag = true; //show that a swap occurred
    }
  }
}
print_r($array);



  //Method3: DIY 
  $temp = [];
  foreach ($array as $key => $value)
    $temp[$value[2]["sizes"]["weight"] . "oldkey" . $key] = $value; //concatenate something unique to make sure two equal weights don't overwrite each other
  ksort($temp); // or ksort($temp, SORT_NATURAL); see paragraph above to understand why
  $array = array_values($temp);
  unset($temp);
  print_r($array);



  // Method 4
  array_multisort(array_map(function($element) {
    return $element[2]['sizes']['weight'];
}, $array), SORT_ASC, $array);


print_r($array);