Add active Class for each img element - php

Question

I'm using Twitter Bootstrap , I want to add the active class in my for loop, found some articles with <nav> element but I still couldn't get it to work.
Here is my code:
<?php
$tablename = "banners";
$type= 'slider';
$displayBanner = new Display($tablename);
$BannerDataDisplay = $displayBanner->getAllDataByStatusType($type);
//`id`, `bannerName`, `bannerURL`, `status`, `createdBy`, `CreatedDate`
//var_dump($BannerDataDisplay);
echo '
<div id="carousel-example-generic" class="carousel slide" data-ride="carousel">
<ol class="carousel-indicators">
<li data-target="#carousel-example-generic" data-slide-to="0" class="active"></li>
<li data-target="#carousel-example-generic" data-slide-to="1"></li>
<li data-target="#carousel-example-generic" data-slide-to="2"></li>
</ol>
<div class="carousel-inner" role="listbox">
';
for($i=0;$i<count($BannerDataDisplay);$i++){
echo' <div class="item active">
<img src="app/'.$BannerDataDisplay[$i]['bannerURL'].'" alt="Slide">
</div>';
}
echo '
</div>
<a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev">
<span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</a>
<a class="right carousel-control" href="#carousel-example-generic" role="button" data-slide="next">
<span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</a>
</div>
';
?>
PS: If you can solve this, please use this variable: $BannerDataDisplay[$i]['bannerURL'] <- that is the url of my image

Answer 1

OK i Solved it , had to search some related articles mostly from Wordpress:
for ($i=0; $i < count($BannerDataDisplay); $i++) {
if ($i==0) {
echo ' <div class="item active">
<img src="app/' . $BannerDataDisplay[$i]['bannerURL'] . '" alt="Slide">
</div>';
} else {
echo '<div class="item">
<img src="app/' . $BannerDataDisplay[$i]['bannerURL'] . '" alt="Slide">
</div>';
}
}

Answer 2

For current image here you go:
$('.sliderTrigger').on('click', function() {
var index = $(this).attr('data-slide-to');
console.log(index);
$('#myGallery .carousel-inner .item').removeClass('active');
$('#myGallery .carousel-inner .item').each(function(i,element) {
console.log(i)
if(i == index) {
$(this).addClass('active');
}
})
})