removing array field and value

Question

i have the following array when i dd($test) :

array:1 [
  0 => {#81
   +"1": "1"
   +"2": "2"
  }
]

and i want to remove the second field and value so the output will be

array:1 [
  0 => {#81
   +"1": "1"
  }
]

ive been trying to use array_splice and unset but it doesnt get what i want to remove the field and value, am i doing something wrong? how do i make it happen? thanks in advance.

Can you post some code for what you have tried to do? Show us how you used array_splice and unset — IsThisJavascript
– IsThisJavascript, Commented Sep 18, 2017 at 14:40
@PinballWizard if you do a var_dump($test) what you got as ouput? — user8556290
– user8556290, Commented Sep 18, 2017 at 14:40
@headmax dd($test) is die(var_dump($test)); laravel function. See first section of the question above. — Tim Lewis
– Tim Lewis, Commented Sep 18, 2017 at 14:44
The closest I get to reproduce your dump is by putting an array with your key/value pairs through json_encode. If I'm correct you would need to json_decode your variable to use unset — chilly
– chilly, Commented Sep 18, 2017 at 14:48
I've reproduced the array using $test = [(object)["1" => "1", "2" => "2"]];, and then using unset($test[0]->{"1"}); doesn't produce an error, but also doesn't unset the property. — Tim Lewis
– Tim Lewis, Commented Sep 18, 2017 at 14:52

Antonio Carlos Ribeiro · Accepted Answer · 2017-09-18 15:25:23Z

1

I'm not sure why unset is not working for you, but this code

<?php

$var = [
    0 => [
           "1" => "1",
           "2" => "2",
        ]
    ];

var_dump($var);

unset($var[0]["2"]);

var_dump($var);

Will produce this output:

array(1) {
  [0]=>
  array(2) {
    [1]=>
    string(1) "1"
    [2]=>
    string(1) "2"
  }
}

array(1) {
  [0]=>
  array(1) {
    [1]=>
    string(1) "1" /// leaving only the one you needed
  }
}

You can check it here: https://3v4l.org/37X5s

answered Sep 18, 2017 at 15:25

Antonio Carlos Ribeiro

87.9k22 gold badges220 silver badges205 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Tim Lewis Over a year ago

Doesn't array:1 [ 0 => {#81 (...) ]; suggest that $var[0] is an object and not an array?

Tim Lewis · Accepted Answer · 2017-09-18 15:12:34Z

There's 2 approaches I've found to recreate this, and only one has worked when using unset.

Approach 1 - Using (object)[];

$test = [
  (object)[
    "1" => "1",
    "2" => "2"
];

Approach 2 - Using stdClass():

$array = new stdClass();

$array->{"1"} = "1";
$array->{"2"} = "2";

$test = [
  $array
];

At this point, I try to unset() the 2nd key of the first entry in $test:

unset($test[0]->{"2"});

dd($test);

The output of dd($test); following this unset() is:

// Approach 1
array:1 [▼
  0 => {#407 ▼
    +"1": "1"
    +"2": "2"
  }
]

// Approach 2
array:1 [▼
  0 => {#407 ▼
    +"2": "2"
  }
]

It seems that using unset() works as expected when using stdClass(), but if you're casting an array as an object like I tried in Approach 1, unset() will look to work but not actually do anything.

The only way I could get Approach 1 to work is like so:

foreach($test AS $tKey => $array){
  $array = (array)$array;
  foreach($array AS $aKey => $value){
    if($key == 2){
      unset($array[$aKey]);
    }
  }
  $test[$tKey] = (object)$array;
}

Which works, but seems inefficient as I'm casing the casted array to an array then back to an object. Hopefully this gives you some insight into the issue here.

francis94c · Accepted Answer · 2017-09-18 14:55:05Z

-1

i'm guessing the code you printed out here wasn't properly formatted but anyways, to remove and item key and value from an associative array on php, you use the php unset($var) function. Take for instance $data = array("key1"=>"value1", "key2"=>"value2"); when i call unset($data["key2"]); $data now becomes contains only key 1 and value 1.

answered Sep 18, 2017 at 14:55

francis94c

841 silver badge6 bronze badges

Collectives™ on Stack Overflow

removing array field and value

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related