Join array element value with its second neighboring element value (if it exists)

Question

Is it possible to implode multiple array values?

From what I have researched so far, all the examples include imploding multi dimensional arrays (using array_map) or imploding all values from an array using implode(',', $array);

However, I would like to know if there is a way to implode array values from an array:

array([0] (
   array [0] ([0] A, [1] B, [2] C, [3] H)
   array [1] ([0] A, [1] D, [2] G, [3] H, [4] L)
   array [2] ([0] D, [1] Z, [2] J, [3] K, [4] O, [5] X)
)
array([1] (
   array [2] ([0] F, [1] Y, [2] W, [3] H, [4] L)
)
array([2] (
   array [0] ([0] O, [1] T, [2] C, [4] O, [5] X)
   array [1] ([0] U, [1] E, [2] E, [3] D)
))

Note: the strings in each array can be repeated several times and it has no bearing on the outcome.

Desired Outcome

to arrive at a result that looks like this:

$result = array(
          array [0] (A_C, B_H, C)
          array [1] (A_G, D_H, G_L)
          etc...

The expected results should allow me to test, IF the value cannot be combined (because it is at the end of the array), then display the single value

Being a beginner, my first resort was to try out implode implode($array[0], '_', $array[2]);
but I found out it does not work as 2 parameters are allowed

vague question. Please mention scenario and expected pattern. — naf4me
– naf4me, Commented Jun 21, 2016 at 5:03
Telling us you tried to use three parameters for a 2 parameter function just tells us that you're very confused, which can only confuse us. — Julie Pelletier
– Julie Pelletier, Commented Jun 21, 2016 at 5:06
please post your initial array fully and your expected outcome also. you made everyone confused and we are only guessing. Please do it — Death-is-the-real-truth
– Death-is-the-real-truth, Commented Jun 21, 2016 at 7:19

Clyde Lobo · Accepted Answer · 2016-08-09 09:06:12Z

4

Some examples to use implode in multidimensional array

$sampleArray = array(array('abc', 'def', 'hij'), array('mno', 'xxy', 'kkl'));
foreach($sampleArray as $key => $val) {
    $impArray = array($val[0], $val[2]);
    echo implode('_', $impArray);
}


-- -- -- -- -- -Dynamic implode with array first and last value-- -- -- -- -

$sampleArray = array(array('abc', 'def', 'hij'), array('mno', 'xxy', 'kkl'));
foreach($sampleArray as $key => $val) {
    $count = count($val);
    if ($count > 1) {
        $first = reset($val);
        $last = end($val);
        $impArray = array($first, $last);
    } else {
        $first = reset($val);
        $impArray = array($first);
    }

    echo implode('_', $impArray);
}

-- -- -- -- -- -- -- -- -- -- -- -Fully Dynamic with odd, even rules-- -- -- -- --

$finalArray = array();
$sampleArray = array(array('abc', 'def', 'hij', 'dsfd', 'fff'), array('mno', 'xxy', 'kkl'));
foreach($sampleArray as $key => $val) {
    $oddEvenArr = make_array_odd_even($val);
    if (!empty($oddEvenArr['odd']) || !empty($oddEvenArr['even'])) {
        $findMaxSize = 0;
        $oddSize = count($oddEvenArr['odd']);
        $evenSize = count($oddEvenArr['even']);
        if ($oddSize > $evenSize) {
            $findMaxSize = $oddSize;
        } else {
            $findMaxSize = $evenSize;
        }
        for ($i = 0; $i < $findMaxSize; $i++) {
            if (array_key_exists($i, $oddEvenArr['even'])) {
                $finalArray[$key][] = implode('_', $oddEvenArr['even'][$i]);
            }
            if (array_key_exists($i, $oddEvenArr['odd'])) {
                $finalArray[$key][] = implode('_', $oddEvenArr['odd'][$i]);
            }
        }
    }
}

function make_array_odd_even($temp) {
    $odd = array();
    $even = array();
    foreach($temp as $k => $v) {
        if ($k % 2 == 0) {
            $even[] = $v;
        } else {
            $odd[] = $v;
        }
    }
    $oddChunk = array_chunk($odd, 2);
    $evenChunk = array_chunk($even, 2);
    return array('odd' => $oddChunk, 'even' => $evenChunk);
}
echo "<pre>";
print_r($finalArray);
die;

edited Aug 9, 2016 at 9:06

Clyde Lobo

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answered Jun 21, 2016 at 5:15

Dhaval Bhavsar

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5 Comments

Jacob Over a year ago

thanks, your solution works. How would you do though if the array had more than 3 values and I needed to loop all of them with the same pattern e.g. array(array( abc_ghi, def_jkl), array(mno_stu, pqr_vwx, BCD_HIJ) ?

Dhaval Bhavsar Over a year ago

Okay give me some time i am updating with these answer

Jacob Over a year ago

Hi, thanks for the revised code but that does not quite work. it takes the first and last value of the second array, whereas I need to concatenate every second value of the array as follow: array( array (1_3, 2_4, 5_7, 6_8), array (1_3, 2_4))

Jacob Over a year ago

also the arrays may not all be the same length

Dhaval Bhavsar Over a year ago

hi can you recheck with last one code "Fully Dynamic with odd,even rules"

Maulik Kanani · Accepted Answer · 2016-06-21 05:21:25Z

1

<?php
$a = array('abc','def','ghi');
$b[0]=$a;

foreach($b as $key=>$val){ 
    array_splice($val, 1, 1);
    $val=implode('_', $val);
    $output[$key]= $val;
    echo $val;
}
var_dump($output);
?>

Would you please try this ? With $Output you will be get array of desire output so you can use it for array which has multiple element like this as well. :)

answered Jun 21, 2016 at 5:21

Maulik Kanani

6526 silver badges22 bronze badges

2 Comments

Maulik Kanani Over a year ago

Would you please check $b ?

Jacob Over a year ago

Hello, thanks your answer almost works; it does not seem to work. Array to string conversion error

Jayesh Chitroda · Accepted Answer · 2016-06-21 05:06:36Z

0

You can use below script:

$result = $array[0][0].'_'. $array[0][2];
echo $result;

Output:

abc_ghi

answered Jun 21, 2016 at 5:06

Jayesh Chitroda

5,03915 silver badges18 bronze badges

Comments

zanderwar · Accepted Answer · 2016-06-21 05:14:29Z

0

You can try:

$array = array(0 => "abc", 1 => "zyx", 2 => "bcf", 3 => "jhf");

$output = array();
for ($i = 0; $i < count($array); $i++)
{
  $output[] = $array[$i] . "_" . $array[$i+2];
}
var_dump($output);

Returns:

array(4) {
  [0]=>
  string(7) "abc_bcf"
  [1]=>
  string(7) "zyx_jhf"
  [2]=>
  string(4) "bcf_" // $i+2 issue
  [3]=>
  string(4) "jhf_" // $i+2 issue
}

This is bad though, for example when you're on the second last entry+ of $array there is no $i+2

edited Jun 21, 2016 at 5:14

answered Jun 21, 2016 at 5:05

zanderwar

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2 Comments

zanderwar Over a year ago

He can throw it in a foreach loop if he wants, just giving guidance.

Death-is-the-real-truth Over a year ago

A check:- if(isset($array[$i+2])){$output[] = $array[$i] . "_" . $array[$i+2];} will remove i+2 issue as well as the last two weird output "bcf_" and "jhf_"

mickmackusa · Accepted Answer · 2018-01-04 20:43:45Z

0

I thought I would take the opportunity to provide a refined answer to your updated input data. I think this is a simpler method anyhow.

See inline comments for explanation.

Code: (Demo)

$array=[
    [
        ['A','B','C','H'],
        ['A','D','G','H','L'],
        ['D','Z','J','K','O','X']
    ],
    [
        2=>['F','Y','W','H','L']
    ],
    [
        ['O','T','C','O','X'],
        ['U','E','E','D']
    ]
];

foreach($array as $k1=>$lev2){
    foreach($lev2 as $k2=>$lev3){
        foreach($lev3 as $i=>$v){
            if(isset($lev3[$i+2])){ // if can be paired with desired value 
                $result[$k1][$k2][]="{$lev3[$i]}_{$lev3[$i+2]}";
            }else{
                if($i%2==0){  // if index is even
                    $result[$k1][$k2][]=$lev3[$i]; // store the single value
                }
                break;  // stop the loop when no future pairing can be done
            }
        }
    }
}
var_export($result);

Output:

array (
  0 => 
  array (
    0 => 
    array (
      0 => 'A_C',
      1 => 'B_H',
      2 => 'C',
    ),
    1 => 
    array (
      0 => 'A_G',
      1 => 'D_H',
      2 => 'G_L',
    ),
    2 => 
    array (
      0 => 'D_J',
      1 => 'Z_K',
      2 => 'J_O',
      3 => 'K_X',
      4 => 'O',
    ),
  ),
  1 => 
  array (
    2 => 
    array (
      0 => 'F_W',
      1 => 'Y_H',
      2 => 'W_L',
    ),
  ),
  2 => 
  array (
    0 => 
    array (
      0 => 'O_C',
      1 => 'T_O',
      2 => 'C_X',
    ),
    1 => 
    array (
      0 => 'U_E',
      1 => 'E_D',
      2 => 'E',
    ),
  ),
)

answered Jan 4, 2018 at 20:43

mickmackusa♦

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1 Comment

mickmackusa Over a year ago

If this is not your desired output, please leave me a comment. As others have mentioned, your question isn't terribly clear. Even if you are not seeking support with your question anymore, please consider improving your question so that this page can be used as a resource for future readers and a duplicate link if/when someone asks a similar question.

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