PHP - Avoiding Duplicate File Names

My Php Buddies,

I have mysql tbl columns these:

id: 
date_&_time: 
account_activation_code: 
account_activation_status: 
id_video_verification_status: 
id_verification_video_file_url: 
username: 
password: 
primary_domain: 
primary_website_email: 
sponsor_username: 
 

Now, I want to display their row data by excluded a few columns.

Want to exclude these columns:

date_&_time

account_activation_code

account_activation_status

id_verification_video_file_url

password

So, the User's (eg. your's) homepage inside his account should display labels like these where labels match the column names but the underscores are removed and each words' first chars CAPITALISED:

Id: 1
Id Video Verification Status: 1
Username: requinix
Primary_domain: requinix.majesty
Primary Website Email: requeen@requinix.majesty
Sponsor Username: phpsane
Recruits Number: 2

For your convenience only PART 1 works. Need help on Part 2

My attempted code:

	PART 1
	<?php 
	// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
	// Query to get columns from table
$query = $conn->query("SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = 'members' AND TABLE_NAME = 'users'");
	while($row = $query->fetch_assoc()){
    $result[] = $row;
}
	// Array of all column names
$columnArr = array_column($result, 'COLUMN_NAME');
	foreach ($columnArr as $value) { 
echo "<b>$value</b>: ";?><br><?php 
} 
	?>
	 
	PART 2
	<?php 
	//Display User Account Details 
echo "<h3>User: <a href=\"user.php?user=$user\">$user</a> Details</h3>";?><br> 
<?php 
$excluded_columns = array("date_&_time","account_activation_code","account_activation_status","id_verification_video_file_url","password"); 
foreach ($excluded_columns as $value2) 
{    
    echo "Excluded Column: <b>$value2</b><br>";
}
foreach ($columnArr as $value) 
{ 
    
    if($value != "$value2")
    { 
        $label = str_replace("_"," ","$value"); 
        $label = ucwords("$label"); 
        //echo "<b>$label</b>: "; echo "$_SESSION[$value]";?><br><?php 
        echo "<b>$label</b>: "; echo "${$value}";?><br><?php 
    }
} 
?>
	

PROBLEM: Columns from the excluded list still get displayed.

If I have a web page located he

www . company . com / how-to-repair-your-computer.html

And I decide to re-structure my website like this

www . company . com / articles / how-to-repair-your-computer.html

How do I make sure that people don't search and end up at the old, now broken, link?

It seem inevitable that as a website grows, that you will want to re-organize things.  What is the best way to make sure that anyone who searches or clicks on an old link - say from an email from a friend - doesn't get a 404 error?

Also, how do you avoid ruining a web pages rank on Google after you move things?  (I think if the URL changes, Google makes you start all over as far as getting listed on page-1 and all of that?

Is this something I have to hande on my end, or is it a Google issue, or something else?

 I have questions but I also have some good info to share about putting your software in the cloud.  

The situation:

Some of you may have read about the nightmare stories. A developer had a infinite loop in his code that ran all night. This code did things inefficiently that devoured CPU in each iteration. This developer, greatly skilled,  opened his email the next morning and saw a email bill from his cloud provider totaling for $75K. True story. 

Most cloud providers let you define CPU usage thresholds that, when breached, send you a warning but these thresholds, if I understand them, are per account. 

It would seem the claim that cloud resources are available in whatever amounts you need, CPU, disk space, enough RAM to never have to wait on a page faults, etc... the claim that the cloud provides you with infinitely elastic  resources in an "all you can eat for one price" contract smells just a like a little like 💩

I did cloud development for many years with ServiceNow starting when it was a help desk and I watched it evolve into one of the best cloud development platforms out there. At one customer site I installed and managed it it out of the cloud and saw its insides and I can tell you its core code is not so terribly efficient. IMHO the cloud DOES take away 90% of a developer's worries about app performance..

If you call ServiceNow tech support and your problem is diagnosed as a performance issue with your code the first thing they will ask you is "did you follow the developer best practices"? They will politely say "sorry. Here's a link to them implying "fix your code". 

Questions: 

PHP Functions that devour CPU and where there is a better way?

What PHP functions or code techniques waste CPU? I am using similar_text and it does the job but it is slow. Better way?

What is the best way to measure CPU used by a PHP script or by a particular code module, defined as a set of related functions that fulfill a common purpose or by a single line of code? The purpose being to identify inefficient modules of code and improve them and even if the code is damn near perfect then at least can know what code modules are the most expensive.

CPU killin users (and developers too), how can they be identified?

I need to store data on cumulative CPU usage for any of the above and compare it with the free amount they give you and warn CPU hogs before they breach a threshold and generate $75K bills that were not in the plan.

Any info you have on avoiding surprise $75K CPU bills from a cloud provider are welcome

It would seem the