PHP adds different classes to the li tag

......

foreach ($images as $imgUrl){

<code>  echo '<li class="right"></li>'; 
  </code>

}

Part of the code was omitted earlier, and the output from the above is as follows (I output three li):

What I want to achieve is this:

That is, the first class in the list is "left" and the other classes are right.

Reply content:

......

foreach ($images as $imgUrl){

<code>  echo '<li class="right"></li>'; 
  </code>

}

Part of the code was omitted earlier, and the output from the above is as follows (I output three li):

What I want to achieve is this:

That is, the first class in the list is "left" and the other classes are right.

If your $images is an index array, and the index starts from 0, use the following method

<code class="php"><?php
foreach ($images as $index=>$imgUrl) {
    $class = 0===$index ? "left" : "right";
    echo '<li class="' . $class . '"></li>';

}</code>

If your $imagesarray does not meet the above conditions, you can use the following method to achieve it:

<code class="php"><?php
foreach ($images as $imgUrl) {
    $class = empty($class) ? "left" : "right";
    echo '<li class="' . $class . '"></li>';
}</code>

This output method is more troublesome. Logical processing and page display are coupled together. You can try using smarty template engine

Just make the judgment in foreach