Dynamically create a grid layout using div tag in PHP

问题

So I have a question similar to this one but I'm applying it only in vanilla PHP and not in wordpress. After countless hours of struggle I finally got the answer but somehow if I increase the size of my grid number the items are not aligning.

I want it to look like this:

-----------
- 1 2 3 4 -
-----------

But: As stated on my problem if I tried to increase the grid (or more precisely the item) it becomes like this:

-----------
- 1 2 3 4 -
-   5     -
-6        -
-7        -
-----------

It becomes cluttered. Below is the code that I'm trying to experiment.

<div class="container">
<?php
$i=0;
$item=0;
$html_tag = '<div class = "row"><div class="col 3">';

while($item <= 4)
{
?>
    <?php if($i % 4 == 0) {
        $html_tag .= 'col '.$i.'</div>';
    }
    else {
        $html_tag .= '<div class="col"> col '.$i.'</div>';
    }
    ?>
<?php
    $i++;
    $item++;
}
$html_tag .= '</div>';
?>

<?php echo $html_tag ?>

P.S. I'm using twitter bootstrap 4 for it's responsiveness.

EDIT:

Notice the screenshot below, I just realized that there is an extra text which is 'col ?3' inside the div row instead of another div column (which wasn't created).

回答1:

You should inspect your code, the final structure is not correct.

This is what you got

<div class="container">
    <div class="row">
        <div class="col 3">col 0</div>
        <div class="col"> col 1</div>
        <div class="col"> col 2</div>
        <div class="col"> col 3</div>
        col 4
    </div>
</div>

Try with this code

$html = '';
$totalItemPerLine = 3;
$totalItem = 7;
for($i = 0; $i < $totalItem; $i++)
{
    if($i % $totalItemPerLine == 0)
    {
        $html .= '<div class="row">'; // OPEN ROW
    }

    $html .= '<div class="col"> col '.$i.'</div>';

    if($i % $totalItemPerLine == ($totalItemPerLine-1))
    {
        $html .= '</div>'; // CLOSE ROW
    }
}

echo $html;

NOTE: You could do exactly the same with a while, but I used a for for the readability

EDIT:

Based on your comment @DavidDiaz this is the code directly with HTML But I recommend you to learn POO and use class to do this page

$html = '';
$totalItemPerLine = 3;
$totalItem = 7;
for($i = 0; $i < $totalItem; $i++)
{
    if($i % $totalItemPerLine == 0)
    {?>
        <div class="row"> <!-- OPEN ROW -->
    <?php } ?>

    <div class="col"> col <?= $i ?> </div>

    <?php if($i % $totalItemPerLine == ($totalItemPerLine-1))
    { ?>
        </div> <!-- CLOSE ROW -->
    <?php }
} ?>

来源：https://stackoverflow.com/questions/51136821/dynamically-create-a-grid-layout-using-div-tag-in-php

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