Matrix creation failed in PHP - php

Question

I am trying to build a 4x4 matrix like structure in PHP using HTML table.
There can be n number of elements. So calling it 4x4 matrix is kinda appropriate. There can be any number of rows. But a row can have only 4 columns.
Here's what I am trying to make.
Fiddle for this structure is here.
And this is what I am getting as output.
PHP Code:
<table class="tablematrix content table-striped">
<?php
$total=7;
if($total%4==0)
{
$tr=$total/4;
}
else
{
$tr_temp=$total/4;
$tr=$tr_temp+1;
}
for($i=1;$i<=$tr;$i++)
{
echo '<tr>';
for($j=1;$j<=$total;$j++)
{
echo '<td>'.$j.'</td>';
}
echo '</tr>';
}
?>
</table>
CSS
<style>
.tablematrix {
border-collapse:collapse;
table-layout:fixed;
}
.tablematrix * {
height:50px;
width:50px;
min-width:50px;
min-height:50px;
margin:0px;
padding:0px;
}
.tablematrix th,
.tablematrix td {
text-align: center;
border: 1px solid #dddddd;
}
.tablematrix th {
font-weight: bold;
}
.tablematrix tbody > tr:nth-child(odd) > td,
.tablematrix tbody > tr:nth-child(odd) > th {
background-color: #f9f9f9;
}
</style>
Output here
I am kinda stuck here. Don't know how to proceed. Any suggestions?

Answer 1

This code should work
<table class="tablematrix content table-striped">
<?php
$total=7;
$tr=$total;
$count=1;
for($i=1;$i<=$tr;$i++)
{
echo '<tr>';
for($j=1;$j<=4;$j++)
{
echo '<td>'.$count.'</td>';
$count=$count+1;
}
echo '</tr>';
}
?>
</table>
Please try this. You are making a logical mistake. I didn't test my code. So let me know if my code is not working. Thanks.
You can check my ideone here https://ideone.com/STHC7H. Its showing your desired output. So as you said $total is the total number of elements instead of total number of rows the following code will give you correct result
<?php
$total=7;
if($total%4==0)
{
$tr=$total/4;
}
else
{
$tr_temp=$total/4;
$tr=$tr_temp+1;
}
$count=1;
for($i=1;$i<=$tr;$i++)
{
echo '<tr>';
for($j=1;$j<=4;$j++)
{
if($count==$total+1)
break;
echo '<td>'.$count.'</td>';
$count=$count+1;
}
echo '</tr>';
}
?>
I hope it will solve your problem

Answer 2

Check this code:
<table class="tablematrix content table-striped">
<?php
$row=6;
$col=4;
$total=$row*$col;
echo "<tr>";
for($i=1;$i<=$total;$i++)
{
echo "<td>".$i."</td>";
if($i%$col==0)
{ echo '</tr>';
if($i!=$total)
echo '<tr>';
}
}
?>
</table>
OR
<table class="tablematrix content table-striped">
<?php
$total=24;
echo "<tr>";
for($i=1;$i<=$total;$i++)
{
echo "<td>".$i."</td>";
if($i%4==0)
{ echo '</tr>';
if($i!=$total)
echo '<tr>';
}
}
?>
</table>

Answer 3

Amount of columns = "" => 4.
Amount of Rows = "" = ?
Look at this part of your code
echo '<tr>';
for($j=1;$j<=$total;$j++)
{
echo '<td>'.$j.'</td>';
}
echo '</tr>';
you have set $total to 7 so you are runing 7 times and creating 7 columns instead of row which would have made more sense so basically you need to transpose your matrix

Answer 4

Here you have:
<?php
$rows = 6;
$cols = 4;
for ($i = 1; $i <= $rows; $i++) {
echo '<tr>';
for ($l = 1; $l <= $cols; $l++) {
echo '<td>'.((($i - 1) * $cols) + $l).'</td>';
}
echo '</tr>';
}
?>
Tested, should do the job..

Answer 5

You can use this function. It can be optimised not to use $tmp variable
function createHtmlMatrix ($w, $h) {
$matrixHtml = '<table class="tablematrix content table-striped">';
$tmp = 0;
for ($i = 0 ; $i < $h ; ++$i) {
$matrixHtml .= '<tr>';
for ($j = 0 ; $j < $w ; ++$j) {
$matrixHtml .= '<td>'.(++$tmp).'</td>';
}
$matrixHtml .= '</tr>';
}
$matrixHtml .= '</table>';
return $matrixHtml;
}
echo createHtmlMatrix(4,5);

Answer 6

try this
<?php
$row = 6;
$column = 3;
echo "<table style = 'border: 1px solid black'>";
for($x= 0; $x<= $row; $x++){
echo "<tr>";
for($y=0; $y<= $column; $y++){
echo "<td>";
echo $y;
echo "</td>";
}
echo "</tr>";
}
echo "</table>";
?>