Display yes or no based on percentage

If you refresh the page of course it is going to reset. If you want to persist a value between page loads then you need to store the value in cookie/session

is it possible to store the value in a file because in cookie will only work for one user I am trying to make this work for all users..

Yes, you can store the value in a file or in a data base.  Here are some "getting started" resources for PHP:
https://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_11769-And-by-the-way-I-am-new-to-PHP.html

I'll try to give you a translated code sample as soon as the pot is off the stove...

normally this is how I write to text

$file = fopen("test.txt","w");
echo fwrite($file,"Hello World. Testing!");
fclose($file);

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this is some sample code I've got.

$numVotes = 100;
$trueVotes = 70;
$falseVotes = 30;

function addVote($boolVote){

    $numVotes++;
    if($boolVote)

       $trueVotes++:
       return $trueVotes * $numVotes / 100; //percent of true votes
    }
    else{

       $falseVotes++;
       return $falseVotes * $numVotes / 100; //percent of false votes
}

$newVote = true;
$percent = addVote($newVote);

($newVote)$strVote = "true":$strVote = "false";

echo sprintf("The vote is %s and the percent is %01.2f", $strVote, $percent);

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PHP does not have server scope variables like you have in .net

To create the file
http://ie1.php.net/file_put_contents

To get the file
http://ie2.php.net/file_get_contents

PHP uses curly bracket control structure throughout, so this code  fragment fails because it has unbalanced curly brackets.

    if($boolVote)

       $trueVotes++:
       return $trueVotes * $numVotes / 100; //percent of true votes
    }
 

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This would be closer to right:

    if($boolVote) { // NOTE THE OPENING CURLY BRACKET

       $trueVotes++:
       return $trueVotes * $numVotes / 100; //percent of true votes
    }
 

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shall i have two text file and write to yes.txt and no.txt?

If your site is busy you want to keep read/writes to a minimum, even if it is not busy you don't want unnecessary read/writes that will only slow things down.
Stick with one file.

Procedural PHP variable scope:
http://www.php.net/manual/en/language.variables.scope.php

OOP variable (property) visibility:
http://www.php.net/manual/en/language.oop5.visibility.php

this is what I have and its working perfectly fine, what do you guys recommend ?

<?php
ini_set('error_reporting', E_ALL);
ini_set('display_errors', 'On');
ini_set('display_startup_errors', 'On');


function addVote(){
	$iYes = file_get_contents('yes.txt', true);
	$iNo = file_get_contents('no.txt', true);
	
	if ($iNo > ($iYes * 0.42))	{	    
	    $iYes++; // INCREMENT THE "YES" COUNT

			$file = fopen("yes.txt","w");
			echo fwrite($file,$iYes);
			fclose($file);

	    return 'yes'; // FOR THE 70%
	}	else	{
			
	    $iNo++; // INCREMENT THE "NO" COUNT
	    
			$file = fopen("no.txt","w");
			echo fwrite($file,$iNo);
			fclose($file);	    
	    
	    return 'no';  // FOR THE 30%
	}
}


echo 'Vote: '.addVote();
?>

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I understand, so do you guys recommend I move this to MySQL instead of using files?

something like this?

	$sql1 = mysqli_query($GLOBALS['connection'],"SELECT iYes FROM myVote");
	$ret1 = mysqli_fetch_assoc($sql1) ;
	$iYes = $ret1['iYes'];
		
	$sql2 = mysqli_query($GLOBALS['connection'],"SELECT iNo FROM myVote");
	$ret2 = mysqli_fetch_assoc($sql2) ;
	$iNo = $ret2['iNo'];
		
	if ($iNo > ($iYes * 0.42))	{	    
	    $iYes++;
	    mysqli_query($GLOBALS['connection'],"UPDATE myVote SET iYes='$iYes' ;");
	    return 'yes'; // FOR THE 70%
	}	else	{
			
	    $iNo++;	    
	    mysqli_query($GLOBALS['connection'],"UPDATE myVote SET iNo='$iNo' ;");  	    
	    return 'no';  // FOR THE 30%
	}

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For the sake of this just stick with file based, using a db gives you no benefit and would be slower than direct file access.

My guess is that there are other data base activities and this will only be a slice of the application.  You might try timing the script using a data base vs using a flat file.  You will not find any meaningful difference in a correctly-configured web server,  If the database makes your app easier to write, I would not hesitate to use it.

But that said, the data base is not a black box.  It can and will fail for reasons that are outside of your programmatic control. So you want to make the script test for errors and fail "softly" as possible.  Error handling is documented in this article:
https://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/PHP_Databases/A_11177-PHP-MySQL-Deprecated-as-of-PHP-5-5-0.html