Iterate through multiple array and execute function

Question

I have an array with the following structure:

Array
(
    [0] => Array
        (
            [animal] => dog
            [color] => black
        )

    [1] => Array
        (
            [animal] => cat
            [color] => white
        )

    [2] => Array
        (
            [animal] => mouse
            [color] => grey
            [attributes] => Array
                (
                    [nickname] => snuggles
                    [nickname] => buddy
                )

        )

)

I now need to execute a function on every value in the attribute array. So for example capitalize SNUGGLES and BUDDY.

This is my approach:

$array = array(
    array("animal"=>"dog","color"=>"black"),
     array("animal"=>"cat","color"=>"white"),
     array("animal"=>"mouse","color"=>"grey", "attributes" => array("nicknames" => "snuggles", "nicknames" => "buddy"))
);

foreach ( $array as $key => $value ) {
    foreach ( $value as $key1 => $value1 ) {
        if ($key1 == 'attributes') {
            foreach ( $value as $key2 => $value2 ) {
                $value2 =  strtoupper($value2);
                $array [$key] [$key1] [$key2]= $key2;
            }
        }
    }
}

But I get this error:

strtoupper() expects parameter 1 to be string, array given in ...

You can't be testing with the same data as you've posted in your question. Since the there isn't any key called dropdown in the array you've posted, this $key1 == 'dropdown' would never evaluate as true and strtoupper() would never be executed. — M. Eriksson
– M. Eriksson, Commented Dec 22, 2016 at 13:53

jeroen · Accepted Answer · 2016-12-22 13:55:07Z

1

You are using the wrong variable in your inner loop:

foreach ( $value as $key2 => $value2 ) {
          ^^^^^^ here
    ...
}

Judging by the code, you would want to use $value1 there:

foreach ( $value1 as $key2 => $value2 ) {
          ^^^^^^^ here
    ...
}

Assuming that dropdown => attributes...

answered Dec 22, 2016 at 13:55

jeroen

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Comments

Sarath Kumar · Accepted Answer · 2016-12-22 14:05:44Z

1

Simple way to do this is..

foreach ( $array as $key => $value ) {
    /* check whether the index is available or not */
    if( isset( $value['attributes'] ) ) {
         foreach ( $value['attributes'] as $namekey => $names ) {
             /* here capitalise the value and save in same index */
             $array[$key]['attributes'][$namekey] = strtoupper($names);
         }
    }
}
print_r($array);

OUTPUT's:

Array ( [0] => Array ( [animal] => dog [color] => black )
        [1] => Array ( [animal] => cat [color] => white )
        [2] => Array ( [animal] => mouse [color] => grey [attributes] => Array ( [nicknames] => BUDDY ) ) )

answered Dec 22, 2016 at 14:05

Sarath Kumar

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Comments

Jay Teli · Accepted Answer · 2016-12-22 14:12:48Z

//Code : To capitalize each value. You can use below :

$array = array(
    array("animal"=>"dog","color"=>"black"),
     array("animal"=>"cat","color"=>"white"),
     array("animal"=>"mouse","color"=>"grey", "attributes" => array("nickname1" => "snuggles", "nickname2" => "buddy"))
);

foreach ( $array as $index => $value ) 
{
    foreach ( $value as $key1 => $value1 )
    {
        if(is_array($value1))
        {
            foreach ( $value1 as $key2 => $value2 )
            {
                if(is_array($value2))
                {
                    foreach ( $value2 as $key3 => $value3 )
                    {
                        $array[$index][$key1][$key2][$key3] = strtoupper($value3);
                    }
                }
                else
                {
                    $array[$index][$key1][$key2] = strtoupper($value2);
                }
            }
        }
        else
        {
            $array[$index][$key1] = strtoupper($value1);
        }
    }
}

Output :

   Array
(
    [0] => Array
        (
            [animal] => DOG
            [color] => BLACK
        )

    [1] => Array
        (
            [animal] => CAT
            [color] => WHITE
        )

    [2] => Array
        (
            [animal] => MOUSE
            [color] => GREY
            [attributes] => Array
                (
                    [nickname1] => SNUGGLES
                    [nickname2] => BUDDY
                )

        )

)

Saumya Rastogi · Accepted Answer · 2016-12-22 14:22:13Z

0

You can use array_map

You can do it like this:

Let the inputs be (same as yours):

$array = array:3 [
  0 => array:2 [
    "animal" => "dog"
    "color" => "black"
  ]
  1 => array:2 [
    "animal" => "cat"
    "color" => "white"
  ]
  2 => array:3 [
    "animal" => "mouse"
    "color" => "grey"
    "attributes" => array:1 [
      "nicknames" => "snuggles"
      "nicknames" => "buddy"
    ]
  ]
]

Then you can manipulate through your array in a more simplest & shortest way like this:

function toUpper($val) {
    if(is_array($val)) {
        return array_map('toUpper', $val);
    }
    return strtoupper($val);
}

$final_arr = array_map('toUpper', $array);
print_r($final_arr);

This will give you the output as according to your inputs:

array:3 [
  0 => array:2 [
    "animal" => "DOG"
    "color" => "BLACK"
  ]
  1 => array:2 [
    "animal" => "CAT"
    "color" => "WHITE"
  ]
  2 => array:3 [
    "animal" => "MOUSE"
    "color" => "GREY"
    "attributes" => array:1 [
      "nicknames" => "BUDDY"
    ]
  ]
]

Your provided inputs have an array key named attributes which contains a array having 2 values of same key-value pair nicknames. In that case this will take the last one.

Hope this helps!

edited Dec 22, 2016 at 14:22

answered Dec 22, 2016 at 13:55

Saumya Rastogi

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5 Comments

sinisake Over a year ago

This is very nice, but modification is needed. Just 'attributtes' sub-array should be modified...

Saumya Rastogi Over a year ago

@sinisake - Yup, just attributes is needed to be modified. Kindly upvote! :D

sinisake Over a year ago

"I now need to execute a function on every value in the attribute array. So for example capitalize SNUGGLES and BUDDY." - so, not every element, just one part of array. :)

Saumya Rastogi Over a year ago

I didn't get you, can you please post a new question for your problem as questions are not meant to be asked here!

sinisake Over a year ago

I didn't posted question, just tried to explain what is wrong: OP doesn't need ALL VALUES of array uppercased, just some of them. :) So, maybe array_map isn't suitable for this.

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