Problème inattendu codage php d'une page avec requête mysql

if (isset($_POST['go']) && $_POST['go'] != 1)

if (isset($_GET['go']) && $_GET['go'] != 1) 

$requete = $connexion->prepare("SELECT Used_names, Correct_names, Current_trinom_name, Current_status FROM taxabase1 left outer join taxabase2 on (taxabase1.Rk_Hist = taxabase2.Rk_Hist) left outer join taxabase3 on (taxabase3.Rk_Hist = taxabase2.Rk_Hist) WHERE taxabase1.Rk_Hist and Used_names is not null and trim(Used_names) != '' ORDER BY Used_names, Correct_names");
	$requete->bindParam(':Rk_Hist', $Rk_Hist, PDO::PARAM_INT);

date_default_timezone_set('Europe/Paris');

date()

$data="phpolls-data-0.dat"; 
$votes="phpolls-votes-0.dat"; 
$path_img="pictures/phpolls.gif"; 
$poll_name="blabla ?";
$dataf=file("phpolls-data-0.dat");
if (!isset($_POST['go']) && $_GET['go'] != 1)
{
     /* Impression des choix */ 
     echo "<i>$poll_name</i>\n";
     echo "<form action='#' method='post'><br>\n";

	 for ($i=0; $i<=count($dataf)-1; $i++)
         echo "<input type=\"radio\" name=\"vote\" value=\"$i\"> $dataf[$i]<br>\n";
 
     echo "<input type='hidden' name='go' value='1'>";
     echo "<br><input type='submit' value='Vote' style='color:#000066;background:#f7f885;height:10;'>"; 
     echo "</form>";
     echo "<a href='index.php?result=1&go=1' rel="nofollow noopener noreferrer" target="_blank"> Results</a>"; 
} 

else
{
     $file_votes=fopen($votes, "r"); 
     $line_votes=fgets($file_votes, 255); 
     $single_vote=explode("|", $line_votes); 
     fclose($file_votes); 
     
     if ($_GET['result']!=1) { 
         
         /* Log du vote */ 
         $file_votes=file($votes); 

		if ($_SERVER['REMOTE_ADDR'] == $file_votes[1]) { 
             echo "<font color=red size=1>You already voted !</font><br>back <a href='index.php' rel="nofollow noopener noreferrer" target="_blank">Home</a> to refresh"; 
             exit; 
         } 
         
         $ficdest=fopen($votes, "w"); 
         for ($i=0; $i<=count($dataf)-1; $i++) { 
             if ($i == $_POST['vote']) { 
                 $single_vote[$i]+=1; 
             } 
             fputs($ficdest, "$single_vote[$i]|"); 
         } 
         fclose($ficdest); 
         $ficdest=fopen($votes, "a"); 
         fputs($ficdest, "\n". $_SERVER['REMOTE_ADDR']); 
         fclose($ficdest); 
         $_GET['result']=1; 
     } 
     
     if ($_GET['result']==1) { 
         
         /* Affichage des résultats */ 
         echo "<table cellpadding=5>"; 
         echo "<tr><td><font face=Verdana size=1>"; 
         echo "<i>Select</i></font>"; 
         echo "</td><td><font face=Verdana size=1>"; 
         echo "<i>%</i></font></td>"; 
         echo "<td><font face=Verdana size=1>"; 
         echo "<i>Votes</i></font></td></tr>"; 
         for ($i=0; $i<=count($dataf)-1; $i++) { 
             $tot_votes+=$single_vote[$i]; 
         } 
         for ($i=0; $i<=count($dataf)-1; $i++) { 
             $stat[$i]=$single_vote[$i]/$tot_votes*100; 
             echo "<tr><td><li><font face=Verdana size=1>"; 
             echo "$dataf[$i]</font></td><td align=left><font face=Verdana size=1>"; 
             echo "<img src="""$path_img\" height=10 width=$stat[$i] align=middle> "; 
             printf("%.1f", "$stat[$i]"); 
             echo "%</font></td><td><font face=Verdana size=1>"; 
             echo "$single_vote[$i]</font>"; 
             echo "</td></tr>"; 
         } 
         echo "</table><p>"; 
         echo "Total: $tot_votes votes | back <a href='index.php' rel="nofollow noopener noreferrer" target="_blank">Home</a>"; 
     } 
}

if (!isset($_POST['go']) && $_GET['go'] != 1)

$p_go = isset($_POST['go']) ? $_POST['go'] : NULL;
$g_go = !empty($_GET['go']) ? $_GET['go'] : NULL;
if(!$p_go && $g_go!=1)

if ($_GET['result']!=1) { 

if ($_GET['result']==1) {

$g_result = !empty($_GET['result']) ? $_GET['result'] : NULL;
	 if ($g_result==1) {