Capitalize title selectively - php

Question

I have a list of headings entered like below:
junior suite for sale
Beautiful eCommerce office
d'Landon Property for rent
stunning House FOR SALE
To make things consistent, we apply text-transform: capitalize to the titles, so that the front-end view would be consistent:
Junior Suite For Sale
Beautiful ECommerce Office
D'Landon Property For Rent
Stunning House For Sale
However, this results in some incorrect names like eCommerce, d'Landon, which is not desirable. Is there anyway to fix this, hopefully without relying on backend logic change (I use PHP by the way)?
Expected result:
Junior Suite For Sale
Beautiful eCommerce Office
d'Landon Property For Rent
Stunning House For Sale

Answer 1

There is no way to do this in CSS alone, but in case javascript is an option as mentioned in my comment, here is a snippet:
let pList = document.getElementsByTagName('h2');
let blackList = /eCommerce|d'Landon/g
for(let i=0; i< pList.length; i++) {
let text = pList[i].textContent;
let newText = text.replace(blackList, '<span class="no-cap">$&<span>');
pList[i].innerHTML = newText;
}
h2 {
text-transform: capitalize;
}
.no-cap {
text-transform: none;
}
<h2>junior suite for sale</h2>
<h2>Beautiful eCommerce office</h2>
<h2>d'Landon Property for rent</h2>
<h2>stunning House FOR SALE</h2>

Answer 2

This is how I would do it in PHP. I would write a bunch of regular expressions to figure out which ones are not the way I want. Then replace the ones I don't want with uppercase and lowercase.
Here for example, in the code below, if all the letters are capital in a word, it is converted. If there are any small letters after the first letter in a word, it isn't converted.
<?php
$titles = ["junior suite for sale",
"Beautiful eCommerce office",
"d'Landon Property for rent",
"stunning House FOR SALE"];
function smart_title($title){
$newtitle = [];
foreach(preg_split("/ /", $title) as $word){
if(preg_match("/^[A-Z]+$/", substr($word, 1, strlen($word)))){
array_push($newtitle, strtoupper(substr($word, 0, 1)).strtolower(substr($word, 1, strlen($word))));
}else if(preg_match("/[A-Z]/", substr($word, 1, strlen($word)))){
array_push($newtitle, $word);
}else{
array_push($newtitle, strtoupper(substr($word, 0, 1)).strtolower(substr($word, 1, strlen($word))));
}
}
return join(" ", $newtitle);
}
foreach($titles as $title){
echo smart_title($title)."\n";
}
?>
Try it out here: http://sandbox.onlinephpfunctions.com/code/450141f600bb5497b46e48b4f96738e811cd3617 .
Result is:
Junior Suite For Sale
Beautiful eCommerce Office
d'Landon Property For Rent
Stunning House For Sale