Display which row and which column has the biggest number of 1's

[Dobby]

Hi,

I am new to PHP and I have this homework due Sunday, I got it on Friday btw I have complete the first part of it , but I can not complete the second part of it. This is the exercise:

Largest Row and Column

Write a 4x4 array and fill it with random 1's or 0's

0 0 1 1

0 1 0 0

1 0 1 1

1 0 0 1

Display which row and which column has the biggest number of 1's

this is my code: 

<?php

$num = array("0", "1");



$rows = rand(4, 4); //using rand() function to generate 4 different numbers, min & max=4

$cols = rand(4, 4);



echo "<table>";

for($i = 1; $i <= $rows; $i++)

{

    echo "<tr>";

    for($j = 1; $j <= $cols; $j++)

    {

     $td_text = $num[rand(0,(count($num)-1))]; //number spacing

        echo '<td>'.$td_text.'</td>';

    }

    echo "</tr>";

}



?>

[edit : zane] Don't hesitate to use code tags next time ;), it's the <> button.

[Barand]

Well, you've output a table of 0s and 1s, but what are you going to count?

Store the random 0/1s in a two-dimensional  array  then count the array contents.

Output the array into the table.

[Barand]

I assume you've had a go at it yourself by now. Here's my effort...

<?php
$data = [];
for ($r=0; $r<4; $r++) {
    for ($c=0; $c<4; $c++) {
        $data[$r][$c] = rand(0,1);
    }
}

$rowcounts = $colcounts = [];
for ($r=0; $r<4; $r++) {
    $rowcounts[$r] = count(array_keys($data[$r], 1));
}
for ($c=0; $c<4; $c++) {
    $colcounts[$c] = count(array_keys(array_column($data,$c), 1));
}

$rmax = max($rowcounts);
$cmax = max($colcounts);
$rcmax = max($rmax, $cmax);

$hirows = array_keys($rowcounts, $rcmax);
$hicols = array_keys($colcounts, $rcmax);

echo "<table border='1' style='border-collapse:collapse'>\n";
for ($r=0; $r<4; $r++) {
    echo "<tr>";
    for ($c=0; $c<4; $c++) {
        $hilite = (in_array($r, $hirows) || in_array($c, $hicols)) ? 'class="max"' : '';
        echo "<td $hilite>&nbsp;{$data[$r][$c]}&nbsp;</td>";
    }
    echo "</tr>\n";
}
echo "</table>\n";   
?>

[Dobby]

Barand thank you for your help . Your comment really helped me!