Insert new item to wordpress array [PHP] - php

Question

I want to insert new <li> element to my function output.
function gallery_nav() {
$i = 0;
foreach ($myArray as $key ) {
$i++;
echo '<li>'. $i .'</li>';
}
}
It printing this html
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
Can i insert custom <li> element into this array? Like this:
<li>1</li>
<li>2</li>
<li class="custom">3</li>
<li>4</li>
<li>5</li>
<li class="custom">6</li>
<li>7</li>
<li>8</li>
<li>9</li>

Answer 1

If your custom indexes are assigned in an array, you can do something like this:
<?php
$myArray = array(1,2,3,4,5,6,7); # Your original array
$customArray = array(3,6); # Your custom array
$VarCount = count($myArray); # Set the default loop count
function gallery_nav($myArray, $customArray=NULL, $VarCount) {
for($i=1; $i<=$VarCount; $i++) {
$Class = NULL;
if(in_array($i, $customArray)){
$VarCount++; # Increment extra <li>
$Class = "class=\"custom\"";
}
echo "<li {$Class}>{$i}</li>
";
}
}
gallery_nav($myArray,$customArray, $VarCount);
?>
Which results in:
<li >1</li>
<li >2</li>
<li class="custom">3</li>
<li >4</li>
<li >5</li>
<li class="custom">6</li>
<li >7</li>
<li >8</li>
<li >9</li>
See live demo.

Answer 2

You could simply modify your function to check for a specific iteration number and output something extra:
$i = 0;
foreach ($myArray as $item => $value) {
$i++;
if ($i % 3 === 0) {
echo '<li class="custom">' . $i . '</li>';
}
echo '<li>'. $i .'</li>';
}
This will add an extra li element every 3 iterations.
If you don't want it to add an extra li every third iteration, then modify it back to this:
$i = 0;
foreach ($myArray as $item => $value) {
$i++;
if ($i % 3 === 0) {
$class = 'custom';
} else {
$class = '';
}
echo '<li class="' . $class .'">' . $i . '</li>';
}
If you only need it on iterations 3 and 6 and no others, modify the condition to this:
if ($i === 3 || $i === 6) {
// code
}