PHP - Change value if same and multiple in array exept the first

Question

I'm trying to change values of an array if one af the value is several times into and change duplicate values exept the first.

I have this array:

array (size=6)
  0 => 
    array (size=3)
      'id' => int 1
      'data-time-start' => int 0
      'data-time-end' => int 5
  1 => 
    array (size=3)
      'id' => int 2
      'data-time-start' => int 6
      'data-time-end' => int 10
  2 => 
    array (size=3)
      'id' => int 1
      'data-time-start' => int 11
      'data-time-end' => int 15
  3 => 
    array (size=3)
      'id' => int 3
      'data-time-start' => int 16
      'data-time-end' => int 20
  4 => 
    array (size=3)
      'id' => int 4
      'data-time-start' => int 21
      'data-time-end' => int 25
  5 => 
    array (size=3)
      'id' => int 3
      'data-time-start' => int 30
      'data-time-end' => int 35
  6 => 
    array (size=3)
      'id' => int 3
      'data-time-start' => int 40
      'data-time-end' => int 45

In this example I have two times 'id' = int 1 and three times 'id' = int 3 . What I would like to do is to keep the first ID but set other duplicate IDs to NULL and return an array like this:

 array (size=6)
  0 => 
    array (size=3)
      'id' => int 1
      'data-time-start' => int 0
      'data-time-end' => int 5
  1 => 
    array (size=3)
      'id' => int 2
      'data-time-start' => int 6
      'data-time-end' => int 10
  2 => 
    array (size=3)
      'id' => null
      'data-time-start' => int 11
      'data-time-end' => int 15
  3 => 
    array (size=3)
      'id' => int 3
      'data-time-start' => int 16
      'data-time-end' => int 20
  4 => 
    array (size=3)
      'id' => int 4
      'data-time-start' => int 21
      'data-time-end' => int 25
  5 => 
    array (size=3)
      'id' => null
      'data-time-start' => int 30
      'data-time-end' => int 35
  6 => 
    array (size=3)
      'id' => null
      'data-time-start' => int 40
      'data-time-end' => int 45

I'm not an expert in php ...

EDIT 1 :

Tried with that:

function setNulForDuplicatesInArray($arr, $keyToFind)
    {
        $newArr = array();
        for ($i = 0; $i < sizeof($arr); $i++) {
            if (in_array($arr[$i], $newArr))
                $newArr[$i][$keyToFind] = null;
            else
                $newArr[] = $arr[$i];
        }
        return $newArr;
    }

var_dump(setNulForDuplicatesInArray($arr, 'id'))

But nothing happened

Thanks for your help !

@anantkumarsingh Pretty bad advice, you'd be amazed how many problems here would have been obvious right away if a var_dump had been used instead of a print_r. — jeroen
– jeroen, Commented Apr 2, 2015 at 7:46

Eranda · Accepted Answer · 2015-04-02 08:40:36Z

2

function setNulForDuplicates($theArray) {
    $myarray = array();
    for ($ind = 0; $ind < count($theArray); $ind++) {
        if (in_array($theArray[$ind], $myarray)) {
            $myarray[$ind]['id'] = 'null';
        } else {
            $myarray[$ind] = $theArray[$ind];
        }
    }
    return $myarray;
}

var_dump(setNulForDuplicates($arr));

edited Apr 2, 2015 at 8:40

answered Apr 2, 2015 at 8:08

Eranda

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1 Comment

Zagloo Over a year ago

Works nice ! but How to do if my array have other index ? see my post, I updated it ! thanks :)

ksbg · Accepted Answer · 2015-04-02 07:58:32Z

1

Here's a little function that should do the trick:

function replace($arr) {
    $newArr = array();
    for($i=0; $i<sizeof($arr); $i++) {
        if(in_array($arr[$i], $newArr))
            $newArr[$i]['id'] = 'null';
        else
            $newArr[] = $arr[$i];
    }
    return $newArr;
}

It loops through the array and checks whether the same entry already exists in $newArr. If it does, id is set to null. If not, the entry is being pushed into $newArr.

Please note that in this example null is a string. I did that because in your desired result, null is a string. If that's not desired, simply remove the surrounding quotes.

edited Apr 2, 2015 at 7:58

answered Apr 2, 2015 at 7:51

ksbg

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2 Comments

Zagloo Over a year ago

Works nice ! but How to do if my array have other index like :

array (size=6)   0 =>      array (size=1)       'id' => int 1   1 =>      array (size=1)       'id' => int 2   2 =>      array (size=1)       'id' => int 2   3 =>      array (size=1)       'id' => int 3

? I update my post

Zagloo Over a year ago

I updated my post because array change a litlle... his got some index more

qiandutianxia · Accepted Answer · 2015-04-02 07:55:09Z

1

$arr=array(
    array("id"=>1),
    array("id"=>2),
    array("id"=>1),
    array("id"=>3),
    array("id"=>4),
    array("id"=>3),
    array("id"=>3)
    );
var_dump($arr);
$tmp=array();
foreach($arr as $k =>$v){
    if(!in_array($v['id'], $tmp)){
        $tmp[]=$v['id'];
    }else{
        $arr[$k]['id']=null;
    }
}
var_dump($arr);

answered Apr 2, 2015 at 7:55

qiandutianxia

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3 Comments

Zagloo Over a year ago

Works nice ! but How to do if my array have other index ? see my post, I updated it ! thanks :)

qiandutianxia Over a year ago

Why don't you use print_r

qiandutianxia Over a year ago

Do not understand it for your post. For example

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