Get the dimensions of a 2D array relative to the size of a 1D array

Question

I have one dimensional array like this

$arr=array('1','2','3','4','5','6','7','8','9','10','11','12','13'......'21');

From this, I want to create a two-dimensional array similar to this.

The dimension of the 2D array depends on the number of elements in the 1D array.

Terms

1. The number of rows in a 2D array is fixed as 5.

2. The number of columns may vary.

3. The third line will be empty except for the last item

Note

The size of the one-dimensional array changes.

We also need to get the dimension of the 2D array, how can I print it?

UPDATE

Here is my code

$k=0;
$l=0;
$i=0;
$A=array('1','2','3','4','5','6','7','8','9','10');
//size of 1D array
$size=count($arr);
//2D array
$B=[];
$x=?;//no of columns of 2d array
$y=5;//no of rows of 2d array

for($i=0;$i<$size;$i++){

        $B[k][l]=$A[i];
        $k++;

        if($k==2 && $l!=$x){
                $k++;

        }
        if($k==4){
                $l++;
        }

}

How can I get the value $xis the size of the columns of a 2D array

Answer 1

: (: Array ) 1D , .

: - (, 10), * , 3 .

$itemCount = 49;

$residual = $itemCount % 4;

$starCount = ceil($itemCount/4);

if ($residual > 1) {
    $starCount -= 1;
} else if ($residual) {
    $starCount -= 2;
}



$itemsArray = [];
$key = 0;
for ($i = 1 ; $i <= $itemCount ; $i++ ) {
     $key = $key % 5 ;  // fixing the offset and row number
     if ($key == 2 && $starCount) {
         $itemsArray[$key][] = '*';
         $starCount--;
     $key++;
         $itemsArray[$key][] = $i;
     } else {
         $itemsArray[$key][] = $i;
     }  
    $key++; 

}

print_r($itemsArray); //check output

21, 49, 50, 51. 1 , . ( , , )

. , ( -). , .

$itemCount = count($yourArray);

for foreach ($yourArray as $i) ( $i - ).

21

1  5  9  13 17 
2  6  10 14 18 
*  *  *  *  19 
3  7  11 15 20 
4  8  12 16 21

49

1  5  9  13 17 21 25 29 33 37 41 45 
2  6  10 14 18 22 26 30 34 38 42 46 
*  *  *  *  *  *  *  *  *  *  *  47 
3  7  11 15 19 23 27 31 35 39 43 48 
4  8  12 16 20 24 28 32 36 40 44 49

50

1  5  9  13 17 21 25 29 33 37 41 45 49 
2  6  10 14 18 22 26 30 34 38 42 46 50 
*  *  *  *  *  *  *  *  *  *  *  *  
3  7  11 15 19 23 27 31 35 39 43 47 
4  8  12 16 20 24 28 32 36 40 44 48

51

1  5  9  13 17 21 25 29 33 37 41 45 49 
2  6  10 14 18 22 26 30 34 38 42 46 50 
*  *  *  *  *  *  *  *  *  *  *  *  51
3  7  11 15 19 23 27 31 35 39 43 47 
4  8  12 16 20 24 28 32 36 40 44 48

:

<?php

$itemCount = 21;


$array = range(1,$itemCount);// the 1D array 
$residual = $itemCount % 4;

$starCount = ceil($itemCount/4);

if ($residual > 1) {
    $starCount -= 1;
} else if ($residual) {
    $starCount -= 2;
}



$itemsArray = [];
$key = 0;
foreach ($array as $i) {
     $key = $key % 5 ;  // fixing the offset and row number
     if ($key == 2 && $starCount) {
         $itemsArray[$key][] = '*';
         $starCount--;
     $key++;
         $itemsArray[$key][] = $i;
     } else {
         $itemsArray[$key][] = $i;
     }
    $key++;

}

print_r($itemsArray); //check output

Answer 2

. .

:

$arr = array('1','2','3','4','5','6','7','8','9','10', '11');

$arrLength = count($arr);
$columns = ceil($arrLength / 4);
$rows = ($columns == 1) ? (($arrLength > 2) ? $arrLength + 1 : $arrLength) : 5;

echo "Grid dimension: " . $rows . " x " . $columns . "<br />"; 

$output_array = array();
$index = 0;
for($i = 0; $i < $columns; ++$i){
    for($j = 0; $j < $rows; ++$j){
        if($j == 2 && ($i != $columns - 1 || $columns == 1)){
            $output_array[$j][$i] = "*";
            continue;
        }
        $output_array[$j][$i] = isset($arr[$index]) ? $arr[$index] : "";
        ++$index;
    }
}

// display $output_array
for($i = 0; $i < $rows; ++$i){
    for($j = 0; $j < $columns; ++$j){
        echo $output_array[$i][$j] . " ";
    }
    echo "<br />";
}

:

Grid dimension: 5 x 3
1 5 9
2 6 10
* * 11
3 7
4 8 

Answer 3

:

<?php
$arr=array('1','2','3','4','5','6','7','8','9','10','11','12','13','14','15','16','17','18','19','20','21');
$len=count($arr);
$key=0;
$rows=5;
$cols=floor(($len - 2)/4) + 1;
for ($j=0;$j<$cols;$j++)
    for ($i=0;$i<$rows;$i++)                    
        if ($i==2 && $j!=$cols-1) {
            $arr2D[$i][$j] = '*';
        } else {        
            $arr2D[$i][$j] = $key>=$len ? "" : $arr[$key++];
        } 
//print array
echo "<table>";
for ($i=0;$i<$rows;$i++){
    echo "<tr>";
    for ($j=0;$j<$cols;$j++)    
        echo "<td width='30px'>" . $arr2D[$i][$j] . "</td>";  
    echo "</tr>";
}
echo "</table>";
?>

:

1   5   9   13  17
2   6   10  14  18
*   *   *   *   19
3   7   11  15  20
4   8   12  16  21