how to loop through items but display them in group of 6 - php

Question

I have an array of 34 logos. I would like to display them but I want to make a slider and have 6 logos on each slides.
I have difficulties to create the loop. My code is in Php but it's the logic who matters here I think. Here what I have done so far. I miss the loop in the middle.
$number_of_slides = round($logo_array, 0, PHP_ROUND_HALF_UP);
for($i ; $i < $number_of_slides ; $i++):
<div class="slide">
......
</div>
<?php endfor; ?>
Thanks for any help

Answer 1

If you already have your array split it into chunks:
$logo_array = [];
$chunks = array_chunk($logo_array, 6); // 6 is a size of chunk
foreach ($chunks as $chunk) {
// do dome stuff for each chunk, open some wrapper div or whatever
foreach ($chunk as $logo) {
// output current logo
}
// do dome stuff for each chunk, close some wrapper div or whatever
}

Answer 2

Or, if you want to do it in one loop, you could use some modulo logic:
$number_of_slides = 25;
$str='<div class="slide">';
for ($i=0 ; $i < $number_of_slides-1 ; $i++) {
$str.= $logo_array[$i].($i%6==5?"</div>\n<div class=\"slide\">":' ');
}
$str.=$logo_array[$i].'</div>';
echo $str; // output the whole string
A simplified demo can be found here: http://rextester.com/DVMPR99965

Answer 3

This not have any sense... your slider is in JS I presume? If it is, all logos would necessarily be into page and is your slider that will take care of the rest.
Some sliders have a specific verbose to separate the itens, others don't, just needing to set the max number of itens to be displayed into page.
What I would do? Well:
<div class="slide">
<?php
foreach($logo_array as logo){
echo "<img src='{$logo[src]}'>"; //or other tag pattern of your slider
}
?>
</div>