Nrthugu

I have a multidimensional array. The arrays will have different lengths and seldom will they have the same length. My problem here is how can I make it so that the arrays will all share the length of the array with the biggest size?

My Array:

Array

(

    [1] => Array

        (

            [Session 2] => Beer

            [Food] => Chicken

            [Drink] => Beer

        )



    [2] => Array

        (

            [Session 2] => Tea

            [Food] => Aaaa

            [Drink] => Ddd

            [Cake] => Weee

            [Brownies] => Rrrr

        )



)

Expected output:

Array

(

    [1] => Array

        (

            [Session 2] => Beer

            [Food] => Chicken

            [Drink] => Beer

            [Cake] => ''

            [Brownies] => ''

        )



    [2] => Array

        (

            [Session 2] => Tea

            [Food] => Aaaa

            [Drink] => Ddd

            [Cake] => Weee

            [Brownies] => Rrrr

        )



)

The array size is not limited to only two arrays. Is this even possible and if so how?

I only want to copy the array keys and not the values its main purpose here is for presenting the content of the array in a table.

Here's one option, where you build an array of all possible array keys, then loop over your original array and set empty strings to the keys that don't exist yet:

// find all possible keys

$keys = ;

foreach ($array as $entry) {

    $keys = array_merge($keys, array_keys($entry));

}



// pad missing keys with an empty string

foreach ($array as &$entry) {

    foreach ($keys as $key) {

        if (!isset($entry[$key])) {

            $entry[$key] = '';

        }

    }

}

If the main purpose is to show the data in a table, then you do not need to fill in the missing keys. You can use the isset() or empty() functions to determine whether an array has a given key. So, your table code could look like the following:

<?php

foreach ($rows as $row) {

    echo "<tr>";

    echo "<td>" . isset($row["Session 2"]) ? $row["Session 2"] : "" . "</td>"; //Old school

    echo "<td>" . $row["Food"] ?? "" . "</td>"; //PHP 7+

    //remaining rows

    echo "</tr>";

}

Let's say the array you're talking about is inside a variable $array,

Do this to find the maximum length;

$max = 0;



foreach($array as $index => $value){



    if($index == sizeof($array) - 1){

        break;

    }



    if($index && $max > sizeof($array[$index+1])){

        $max = $max;

    }

    if(!$index && sizeof($value) > sizeof($array[$index+1])){

        $max = sizeof($value);

    }else {

        $max = sizeof($array[$index+1]);

    }

}