codeigniter: how to transform array value from specify index?

Question

i have an array like this

array(2) { 
[0]=> object(stdClass)#20 
      (4) { 
           ["id"]=> string(1) "1" 
           ["name"]=> string(6) "robert" 
           ["height"]=> string(3) "165" 
           ["weight"]=> string(2) "81" } 
[1]=> object(stdClass)#21 
      (4) { 
           ["id"]=> string(1) "2" 
           ["name"]=> string(4) "mike" 
           ["height"]=> string(3) "175" 
           ["weight"]=> string(2) "69" } }

so, I want to change my array values.

for example i want to change all value from ["height"] and ["weight"]. I categorize height and weight in the form of numbers like this:

height

1 = 150 .......... 170

2 = 171 .......... 190

weight

1 = 50 ........... 70

2 = 71 ........... 80

array(2) { 
[0]=> object(stdClass)#20 
      (4) { 
           ["id"]=> string(1) "1" 
           ["name"]=> string(6) "robert" 
           ["height"]=> string(1) "1" 
           ["weight"]=> string(1) "2" } 
[1]=> object(stdClass)#21 
      (4) { 
           ["id"]=> string(1) "2" 
           ["name"]=> string(4) "mike" 
           ["height"]=> string(1) "2" 
           ["weight"]=> string(1) "1" } }

my array is dynamic so that value can change anytime. of course ["name"] will not change at all because I did not give categorization. can you help me how to solve this problem?

What do you mean that your array is dynamic? and is the array build from a database? — Lupin
– Lupin, Commented May 27, 2015 at 5:56
yes, i call from database. after that, i want to transform array value without change anything in database @Lupin — Bayu Angga Satrio
– Bayu Angga Satrio, Commented May 27, 2015 at 5:58

JSelser · Accepted Answer · 2015-05-27 06:01:49Z

2

Given your example array to be:

//example people array
$people = [
      //robert
      (object)[
            "id" =>"1",
            "name"=> "robert",
            "height" => "165", 
            "weight" => "79",
            ],

      //mike
      (object)[
        "id" => "2",
        "name"=> "mike",
        "height"=> "175", 
        "weight" =>"69",
        ]
  ];

You could walk the array and modify each object after a little comparison. Note im not checking all possible ranges to keep this concise (it should be just a couple more checks)

//walk the array 
array_walk($people, function($person){

  //test height and assign category
  if($person->height <= 190 && $person->height > 170)
    $person->height = "2";
  else
    $person->height = "1";

  //test weight and assign category
  if($person->weight <= 80 && $person->weight > 70)
    $person->weight = "2";
  else
    $person->weight = "1";
});

Which produces the desired result you can check live here (CTRL+ENTER to run)

answered May 27, 2015 at 6:01

JSelser

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1 Comment

Bayu Angga Satrio Over a year ago

woooww!! this is what I was looking for! you've saved my life @JSelser !

Lupin · Accepted Answer · 2015-05-27 06:06:15Z

1

You can use an array callback function like array_map

function changeMe($itemArr) {
    foreach($itemArr as $key=>$value) {
        if($key == "a") {
            $itemArr[$key] = "newVal";  
        }
    }

    return $itemArr;
}

$myArray = array(
                0=>array(
                    "a"=>"1", 
                    "b"=>"2"
                ), 
                1=>array(
                    "a"=>"1", 
                    "b"=>"44"
                    )
                );

$myArray = array_map("changeMe", $myArray);

var_dump($myArray);

answered May 27, 2015 at 6:06

Lupin

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Comments

Viral · Accepted Answer · 2015-05-27 06:25:54Z

1

Use array_walk() if you want to change in current array else use array_filter() if you want to produce a new array,

Note that any of them will not change your value in database unless you execute any query.

Using array_walk(),

$array = array(); // your input array here

array_walk( $array, function(&$v){
    ( $v->height > 149 && $v->height < 171 ) ? ( $v->height = 1 ) : ( $v->height = 2 );
    ( $v->weight > 49 && $v->weight < 71 ) ? ( $v->weight = 1 ) : ( $v->weight = 2 );
});

Using array_filter(),

$array = array(); // your input array here

$your_new_array = array_filter( $array, function($v){
    ( $v->height > 149 && $v->height < 171 ) ? ( $v->height = 1 ) : ( $v->height = 2 );
    ( $v->weight > 49 && $v->weight < 71 ) ? ( $v->weight = 1 ) : ( $v->weight = 2 );
    return true;
});

edited May 27, 2015 at 6:25

answered May 27, 2015 at 6:13

Viral

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2 Comments

Bayu Angga Satrio Over a year ago

thank you my friend @Viral , my problem is solved. your code is same like JSelser 's code, but I really appreciate because you've helped answer my question.

Viral Over a year ago

glad to be of help! I just wanted to make array_filter and array_walk clear. :)

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