Using PHP loop to add Bootstrap rows and proper column numbers to elements

Question

I\'m trying to create the following front-end using a PHP loop and Twitter Bootstrap\'s 12 column grid system:

The HTML output is:

        
                      

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Answer 1

Everytime I need to to this, I just use array_chunk to build a proper array chunk for my rows and columns.

For example You have:

$posts = [['id' => 1], ['id' => 2] ...]

Instead of looping and calculating whether to add row, make chunks of your posts:

$posts = [['id' => 1], ['id' => 2] ...]

$postChunks = array_chunk($posts, 4); // 4 is used to have 4 items in a row
foreach ($postChunks as $posts) {
    <div class="row">
        foreach ($posts as $post) {
            <div class="col-md-3">
                <?=$post['id'];?>
            </div>     
        }
    </div>
}

Answer 2

        <?php
            //total products or items you have
            $total_pr = count($products);

            //grid of columns you want 
            $grid = 3;
            $tol_raw = ceil($total_pr / $grid);
            $count =0;
        ?>


        <?php for($i=0;$i<$tol_raw;$i++): ?>
            <?php

            $repeat = $grid;
            if($total_pr<$grid)$repeat = $total_pr;
            $total_pr -= $repeat;

            ?>
            <div class="row">
                <?php for($pr=0;$pr<$repeat;$pr++):?>
                    <?php $product = $products[$count]; ?>
                     <!-- column selection is based onn your grid -->
                    <div class="col-md-4">
                         //do whatever you want to do here
                    </div>
                    <?php $count++; ?>
                <?php endfor; ?>
            </div>
        <?php endfor; ?>

Answer 3

Why don't you evaluate your modulo?

$two = false; 
if($i%3 == 2)
{
      <div class="col-md-6">
         Content...
      </div>
      $two = true;  
}

if($i%3 == 1)
{
      if($two)
      {
          <div class="col-md-6">
              Content...
          </div>
      }
      else
      {
          <div class="col-md-12">
              Content...
          </div>              
      }          
}

Answer 4

Print a row at a time determining html class for each element depending on how full the row is; for 0 col-md-4, for 1 col-md-12... You would need some helper structures. Finally print the final row if there's something in the buffer.

/**
 * Prints the row in a grid
 * @param array $posts
 * @param string $class
 */
function printRow($posts, $class) {
    echo '<div class="row">';

    foreach ($posts as $post) {
        echo '<div class="' . $class . '">' . $post . '</div>';
    }

    echo '</div>';
}

$i = 0;
$htmlClasses = ['col-md-4', 'col-md-12', 'col-md-6']; //helper for setting html classes
$buffer = []; //helper array to hold row elements

while (have_posts()) {
    the_post();
    $i++;

    $mod = $i % 3;

    //determine html class
    $htmlClass = $htmlClasses[$mod];

    if ($mod > 0) {
        $buffer[] = $currentPost; //this is the post content
    } else {
        printRow($buffer, $htmlClass);
        $buffer = [];
    }
}

//printing final row if there are elements
if (!empty($buffer)) {
    printRow($buffer, $htmlClass);
}

Answer 5

I think I found the solution by first finding at which item the last row starts and applying the appropriate column number to all the items in that row:

<?php
$max_columns = 3; //columns will arrange to any number (as long as it is evenly divisible by 12)
$column = 12/$max_columns; //column number
$total_items = $loop->post_count;
$remainder = $loop->post_count%$max_columns; //how many items are in the last row
$first_row_item = ($total_items - $remainder); //first item in the last row
?>

<?php $i=0; // counter ?>

<?php while ( have_posts() ) : the_post(); ?> 

    <?php if ($i%$max_columns==0) { // if counter is multiple of 3 ?>
    <div class="row">
    <?php } ?>

    <?php if ($i >= $first_row_item) { //if in last row ?>   
    <div class="col-md-<?php echo 12/$remainder; ?>">
    <?php } else { ?>
    <div class="col-md-<?php echo $column; ?>">
    <?php } ?>
        Content...
    </div>        

    <?php $i++; ?>

    <?php if($i%$max_columns==0) { // if counter is multiple of 3 ?>
    </div>
    <?php } ?>

<?php endwhile; ?>

<?php if($i%$max_columns!=0) { // put closing div if loop is not exactly a multiple of 3 ?>
</div>
<?php } ?>

The advantage is that any number (evenly divisible by 12) can be added to $max_columns and it will apply the proper columns.

Answer 6

I liked your question because I'm working on a very similar situation. Since other answers are a bit longer, I decided to leave mine here for your consideration. For me, the less variables you use, the best the solution is.

BootstrapContentArranger.php

<?php
function BootstrapContentArrange($i) {
    $items = $i;                // qnt of items
    $rows = ceil($items/3);     // rows to fill
    $lr = $items%3;             // last row items
    $lrc = $lr;                 // counter to last row

    while ($items > 0) {        // while still have items
        $cell = 0;
        if ($rows > 1) {        // if not last row...
            echo '<div class="row">'.PHP_EOL;
            while ($cell < 3) {     // iterate with 3x4 cols
                echo '<div class="col-md-4">Content</div>'.PHP_EOL;
                $cell++;
            }
            echo "</div>".PHP_EOL;
        $rows--;        // end a row
        } elseif ($rows == 1 && $lr > 0) {      // if last row and still has items
            echo '<div class="row">'.PHP_EOL;
            while ($lrc > 0) {      // iterate over qnt of remaining items
                $lr == 2 ?      // is it two?
                    print('<div class="col-md-6">Content</div>'.PHP_EOL) :  // makes 2x6 row
                    print('<div class="col-md-12">Content</div>'.PHP_EOL); // makes 1x12 row
                $lrc--;
            } 
            echo "</div>".PHP_EOL;
            break;
        } else {        // if round qnt of items (exact multiple of 3)
            echo '<div class="row">'.PHP_EOL;
            while ($cell < 3) {     // iterate as usual
                echo '<div class="col-md-4">Content</div>'.PHP_EOL;
                $cell++;
            }
            echo "</div>".PHP_EOL;
            break;
        }
        $items--;       // decrement items until it's over or it breaks
    }
}

Test Cases

BootstrapContentArrange(3);
BootstrapContentArrange(11);
BootstrapContentArrange(1);

1. 3 items, outputs:

<div class="row">
<div class="col-md-4">Content</div>
<div class="col-md-4">Content</div>
<div class="col-md-4">Content</div>
</div>

2. 11 items, outputs:

<div class="row">
<div class="col-md-4">Content</div>
<div class="col-md-4">Content</div>
<div class="col-md-4">Content</div>
</div>
<div class="row">
<div class="col-md-4">Content</div>
<div class="col-md-4">Content</div>
<div class="col-md-4">Content</div>
</div>
<div class="row">
<div class="col-md-4">Content</div>
<div class="col-md-4">Content</div>
<div class="col-md-4">Content</div>
</div>
<div class="row">
<div class="col-md-6">Content</div>
<div class="col-md-6">Content</div>
</div>

3. A single item, outputs:

<div class="row">
<div class="col-md-12">Content</div>
</div>

Note: you can remove the PHP_EOL, I used it to read the source better.