Concatenate Values of N Arrays in PHP

Concatenate values of n arrays in php

You can put all word arrays into one array and use a recursive function like this:

function concat(array $array) {
    $current = array_shift($array);
    if(count($array) > 0) {
        $results = array();
        $temp = concat($array);
        foreach($current as $word) {
          foreach($temp as $value) {
            $results[] =  $word . ' ' . $value;
          }
        }
        return $results;           
    }
    else {
       return $current;
    }
}

$a = array(array('dog', 'cat'), array('food', 'tooth'), array('car', 'bike'));

print_r(concat($a));

Which returns:

Array
(
    [0] => dog food car
    [1] => dog food bike
    [2] => dog tooth car
    [3] => dog tooth bike
    [4] => cat food car
    [5] => cat food bike
    [6] => cat tooth car
    [7] => cat tooth bike
)

But I guess this behaves badly for large arrays as the output array will be very big.

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To get around this, you can output the combinations directly, using a similar approach:

function concat(array $array, $concat = '') {
    $current = array_shift($array);

    $current_strings = array();

    foreach($current as $word) {
            $current_strings[] = $concat . ' ' . $word;
    }

    if(count($array) > 0) {
        foreach($current_strings as $string) {
            concat($array, $string);
        }       
    }
    else {
      foreach($current_strings as $string) {
          echo $string . PHP_EOL;
      }   
    }
}

concat(array(array('dog', 'cat'), array('food', 'tooth'), array('car', 'bike')));

Which gives:

dog food car
dog food bike
dog tooth car
dog tooth bike
cat food car
cat food bike
cat tooth car
cat tooth bike

With this approach it is also easy to get the "sub-concatinations". Just insert echo $string . PHP_EOL; before concat($array, $string); and the output is:

 dog
 dog food
 dog food car
 dog food bike
 dog tooth
 dog tooth car
 dog tooth bike
 cat
 cat food
 cat food car
 cat food bike
 cat tooth
 cat tooth car
 cat tooth bike

php concat array values into new array php

The idea is get the data by column, you're in luck, there's a built in function for that. Its array_column.

So first, get the number of columns and simply use a for loop for that. Then just use implode and assign it inside a new container:

$new = array(); // container
$count = count($arr[0]); // get the number of colums
for ($i = 0; $i < $count; $i++) {
    // get the data by column number ($i), then implode and push inside
    $new[] = implode(',', array_column($arr, $i));
}

Here's a sample output

Merge values from multiple arrays in PHP

Use array_merge() to combine arrays, not array_push().

Remove the duplicates at the end after merging everything.

$json = $this->curl_get_marketplace_contents();
$data = json_decode($json, true);
$categories = array();
foreach ($data['themes'] as $theme) {
    $array = explode(",", $theme['categories']);
    $array = array_map('trim', $array);
    $categories = array_merge($array, $categories);
    
};
return array_unique($categories);

Can't concatenate 2 arrays in PHP

Both will have a key of 0, and that method of combining the arrays will collapse duplicates. Try using array_merge() instead.

$arr1 = array('foo'); // Same as array(0 => 'foo')
$arr2 = array('bar'); // Same as array(0 => 'bar')

// Will contain array('foo', 'bar');
$combined = array_merge($arr1, $arr2);

If the elements in your array used different keys, the + operator would be more appropriate.

$arr1 = array('one' => 'foo');
$arr2 = array('two' => 'bar');

// Will contain array('one' => 'foo', 'two' => 'bar');
$combined = $arr1 + $arr2;

Edit: Added a code snippet to clarify

Concatenate the values from one array to another in PHP

Presuming you want to use the array you created as the array to use to append to. I can't see why you'd need to work with specific characters other than that in the array (I may be wrong, but this can be easily adapted to cater for that).

/**
 * @param array $array
 * @param $length
 * @param null $original
 * @return array
 */
function generate_values(array $array, $length, $original = null) {

    // If length is 1 or less just return the array
    if ($length <= 1) {
        return $array;
    }

    // The resulting values array
    $result = [];

    // Copy the array if original doesn't exist
    if (!is_array($original)) {
        $original = $array;
    }

    // Loop over each item and append the original values
    foreach($array as $item) {
        foreach($original as $character) {
            $result[] = $item . $character;
        };
    }

    // Recursively generate values until the length is 1
    return generate_values($result, --$length, $original);
}

To use it you can use your generator.

$characterArray = generate_characters(true, false, false);

$results = generate_values($characterArray, 2);

PHP concatenate values into array

Try something like this. If this is what you need. Here in the below codes
$mappingId contains array of individual appDate, appTime, appDoctorId in array format. If you don't want array just want concatenate those value with one element then also you can do that. Please let me know!

$mappingId = array(); // combined values

for ($i = 0; $i < mysqli_num_rows($resultAppointmentsBooked); $i++)
{
    $row = mysqli_fetch_row($resultAppointmentsBooked);
    $appId = $row[0];
    $appTime = $row[3];
    $appDate = $row[4];
    $appDoctorId = $row[2];
    $myArr = array();
    //array_push($myArr, $appDate, $appTime, $appDoctorId);
    // If you want in concatenate format
    array_push($myArr, $appDate."".$appTime."".$appDoctorId);
    array_push($mappingId, $myArr);
}

how do I concatenate the string values of two arrays pairwise with PHP?

You could do it with array_map:

$combined = array_map(function($a, $b) { return $a . ' ' . $b; }, $a1, $a2));

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