How to chain several if conditions in php without error?

I know how to chain several if's in php in a row. I'm asking you because I have a mistake and I can't figure out where it comes from. I have a PHP code that allows me to query an API and retrieve a decoded PDF document depending on the user's country.

It's almost 3 times the same block but depending on the client's country the PDF changes.

• When I test the code blocks individually I have no errors.
• When I put two in a row it works fine, but if I add the third block "elseif", although in my form I choose "United States" the code never executes and I don't understand why. If I execute this third if only the code works well.

I put the braces to delimit my 3 blocks, so I don't know where it can come from... if someone can help me to know why the 3rd elseif never executes despite the condition being true ?

<?php

if ($_POST['adresse'][5] == "France"){ 
    $PAYS = $_POST['adresse'][5]; 
    $PAYS = "FR"; 
} elseif ($_POST['adresse'][5] == "Allemagne"){ 
    $PAYS = $_POST['adresse'][5]; 
    $PAYS = "DE"; 
} elseif ($_POST['adresse'][5] == "Suisse"){ 
    $PAYS = $_POST['adresse'][5]; 
    $PAYS = "CH";
} elseif ($_POST['adresse'][5] == "United States"){ 
    $PAYS = $_POST['adresse'][5]; 
    $PAYS = "US"; 
}

if ( $PAYS == 'FR') //first if
{
    
    // the soap operation which is called
    $action = 'euExpressRateBook_providerServices_ShipmentHandlingServices_Binder_createShipmentRequest';
// the xml input of the service
    $xmlrequest = '<?xml version="1.0" encoding="ISO-8859-1"?>
    <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
        ....................
            </ShipmentRequest>
        </soapenv:Body>
    </soapenv:Envelope>';

    try {
        $options = array();
        $options['wrapper'] = array(
            
            'soap_version' => 'SOAP_1_1',
            'encoding' => 'UTF-8',
            'user_agent' => 'PHPSoapClient',
            // The exceptions option is a boolean value defining whether soap errors throw exceptions of type SoapFault.
            'exceptions' => true,
            // The trace option enables tracing of request so faults can be backtraced.
            'trace' => true
            );
    
        $context = stream_context_create($options);
        // create the soapclient and invoke __doRequest method
        //WSDL URL is called on init
        $client = new \SoapClient($wsdlUrl, $options);
        //Here we call REQUEST URL
        $output = $client->__doRequest($xmlrequest, $requestUrl, $action, 1);
    } catch (SoapFault $fault) {
        var_dump($fault);
        echo "<h2>SOAP Fault!</h2><p>";
        echo "FaultCode: {$fault->faultcode} <br/>";
        echo "FaultString: {$fault->faultstring} <br/>";
        echo("</p/>");
    }


    if (is_soap_fault($output)) {
        echo "<h2>SOAP Fault!</h2><p>";
        echo "FaultCode: {$output->faultcode} <br/>";
        echo "FaultString: {$output->faultstring} <br/>";
    } else {
    
        function multiSplit($string)
        {
            $output = array();
            $cols = explode("<GraphicImage>", $string);

            foreach ($cols as $col) {
                $dashcols = explode("</GraphicImage>", $col);
                $output[] = $dashcols[0];
            }
            return $output;
        }

        $DHL = multiSplit($output);

        $filename1 = uniqid(rand(), true) . '.txt';
        $filename2 = uniqid(rand(), true) . '.pdf';

        $file1 = "C:/wamp64/www/Dylan/SAV/API_label/TXT/$filename1";                       
        file_put_contents($file1, print_r($DHL[1], true) . PHP_EOL, FILE_APPEND | LOCK_EX);
   
        $pdf_base64 = $file1;
        //Get File content from txt file
        $pdf_base64_handler = fopen($pdf_base64,'r');
        $pdf_content = fread ($pdf_base64_handler,filesize($pdf_base64));
        fclose ($pdf_base64_handler);
        //Decode pdf content
        $pdf_decoded = base64_decode ($pdf_content);
        //Write data back to pdf file
        $pdf = fopen ("C:/wamp64/www/Dylan/SAV/API_label/PDF/$filename2",'w');
        fwrite ($pdf,$pdf_decoded);
        //close output file
        fclose ($pdf);
        // echo 'Done';
    }
} elseif ( $PAYS == 'DE' || 'BE') //Second if
{

    // the soap operation which is called
    $action = 'euExpressRateBook_providerServices_ShipmentHandlingServices_Binder_createShipmentRequest';
    // the xml input of the service
    $xmlrequest = '<?xml version="1.0" encoding="ISO-8859-1"?>
    <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <soapenv:Header>
    <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" soapenv:mustUnderstand="1">
    <wsse:UsernameToken xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" wsu:Id="UsernameToken-5">
    <wsse:Username>'.$LOGIN.'</wsse:Username>
    <wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">'.$PASSWORD.'</wsse:Password>
    </wsse:UsernameToken>
    </wsse:Security>
    </soapenv:Header>
       <soapenv:Body>
          <ShipmentRequest xmlns="http://scxgxtt.phx-dc.dhl.com/euExpressRateBook/ShipmentMsgRequest">
            ................
             </RequestedShipment>
          </ShipmentRequest>
       </soapenv:Body>
    </soapenv:Envelope>';

    try {
        $options = array();
        $options['wrapper'] = array(
            
            'soap_version' => 'SOAP_1_1',
            'encoding' => 'UTF-8',
            'user_agent' => 'PHPSoapClient',
            
            // The exceptions option is a boolean value defining whether soap errors throw exceptions of type SoapFault.
            'exceptions' => true,
            
            // The trace option enables tracing of request so faults can be backtraced.
            'trace' => true
        );
        
        $context = stream_context_create($options);
        // create the soapclient and invoke __doRequest method
        //WSDL URL is called on init
        $client = new \SoapClient($wsdlUrl, $options);
        //Here we call REQUEST URL
        $output = $client->__doRequest($xmlrequest, $requestUrl, $action, 1);
    } catch (SoapFault $fault) {
        var_dump($fault);
        echo "<h2>SOAP Fault!</h2><p>";
        echo "FaultCode: {$fault->faultcode} <br/>";
        echo "FaultString: {$fault->faultstring} <br/>";
        echo("</p/>");
    }


    if (is_soap_fault($output)) {
        echo "<h2>SOAP Fault!</h2><p>";
        echo "FaultCode: {$output->faultcode} <br/>";
        echo "FaultString: {$output->faultstring} <br/>";
    } else {
 
        function multiSplit($string)
        {
            $output = array();
            $cols = explode("<GraphicImage>", $string);
    
            foreach ($cols as $col)
            {
                $dashcols = explode("</GraphicImage>", $col);
                $output[] = $dashcols[0];
            }
            
            return $output;
        }
     
        $DHL = multiSplit($output);

       $filename1 = uniqid(rand(), true) . '.txt';
       $filename2 = uniqid(rand(), true) . '.pdf';
    
       $file1 = "C:/wamp64/www/Dylan/SAV/API_label/TXT/$filename1";                       
       file_put_contents($file1, print_r($DHL[1], true) . PHP_EOL, FILE_APPEND | LOCK_EX);
       
        $pdf_base64 = $file1;
        //Get File content from txt file
        $pdf_base64_handler = fopen($pdf_base64,'r');
        $pdf_content = fread ($pdf_base64_handler,filesize($pdf_base64));
        fclose ($pdf_base64_handler);
        //Decode pdf content
        $pdf_decoded = base64_decode ($pdf_content);
        //Write data back to pdf file
        $pdf = fopen ("C:/wamp64/www/Dylan/SAV/API_label/PDF/$filename2",'w');
        fwrite ($pdf,$pdf_decoded);
        //close output file
        fclose ($pdf);
        // echo 'Done';
    }
} elseif ( $PAYS  == 'US' || 'GB'|| 'NO'|| 'CH') //Third if
{

    $xmlrequest = '<?xml version="1.0" encoding="ISO-8859-1"?>
    <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    </soapenv:Header>
    ...............................
       </ShipmentRequest>
    </soapenv:Body>
    </soapenv:Envelope>';
    
    try {
     $options = array();
     $options['wrapper'] = array(
         
         'soap_version' => 'SOAP_1_1',
         'encoding' => 'UTF-8',
         'user_agent' => 'PHPSoapClient',
         
         // The exceptions option is a boolean value defining whether soap errors throw exceptions of type SoapFault.
         'exceptions' => true,
         
         // The trace option enables tracing of request so faults can be backtraced.
         'trace' => true
     );
     
     $context = stream_context_create($options);
     // create the soapclient and invoke __doRequest method
     //WSDL URL is called on init
     $client = new \SoapClient($wsdlUrl, $options);
     //Here we call REQUEST URL
     $output = $client->__doRequest($xmlrequest, $requestUrl, $action, 1);
    }
    catch (SoapFault $fault) {
        var_dump($fault);
        echo "<h2>SOAP Fault!</h2><p>";
        echo "FaultCode: {$fault->faultcode} <br/>";
        echo "FaultString: {$fault->faultstring} <br/>";
        echo("</p/>");
    }
    
    
    if (is_soap_fault($output)) {
        echo "<h2>SOAP Fault!</h2><p>";
        echo "FaultCode: {$output->faultcode} <br/>";
        echo "FaultString: {$output->faultstring} <br/>";
    }
    else {
      
    
     function multiSplit($string)
         {
             $output = array();
             $cols = explode("<GraphicImage>", $string);
    
         foreach ($cols as $col)
         {
             $dashcols = explode("</GraphicImage>", $col);
             $output[] = $dashcols[0];
         }
         
         return $output;
      }
    
    
      function multiSplit2($string)
         {
             $output = array();
             $cols = explode("<DocumentImage>", $string);
    
         foreach ($cols as $col)
         {
             $dashcols = explode("</DocumentImage>", $col);
             $output[] = $dashcols[0];
         }
         
         return $output;
      }
      
    $DHL = multiSplit($output);
    $DHL2 = multiSplit2($output);
    
    $filename1 = uniqid(rand(), true) . '.txt';
    $filename2 = uniqid(rand(), true) . '.pdf';
    
    $filename3 = uniqid(rand(), true) . '.txt';
    $filename4 = uniqid(rand(), true) . '.pdf';
    
    $file1 = "C:/wamp64/www/Dylan/SAV/API_label/TXT/$filename1";                       
    file_put_contents($file1, print_r($DHL[1], true) . PHP_EOL, FILE_APPEND | LOCK_EX);
     $file2 = "C:/wamp64/www/Dylan/SAV/API_label/TXT/$filename3";                       
     file_put_contents($file2, print_r($DHL2[1], true) . PHP_EOL, FILE_APPEND | LOCK_EX);
    
     $pdf_base64 = $file1;
     //Get File content from txt file
     $pdf_base64_handler = fopen($pdf_base64,'r');
     $pdf_content = fread ($pdf_base64_handler,filesize($pdf_base64));
     fclose ($pdf_base64_handler);
     //Decode pdf content
     $pdf_decoded = base64_decode ($pdf_content);
     //Write data back to pdf file
     $pdf = fopen ("C:/wamp64/www/Dylan/SAV/API_label/PDF/$filename2",'w');
     fwrite ($pdf,$pdf_decoded);
     //close output file
     fclose ($pdf);
    //  echo 'Done';
    
    
     $pdf_base642 = $file2;
     //Get File content from txt file
     $pdf_base64_handler = fopen($pdf_base642,'r');
     $pdf_content = fread ($pdf_base64_handler,filesize($pdf_base642));
     fclose ($pdf_base64_handler);
     //Decode pdf content
     $pdf_decoded = base64_decode ($pdf_content);
     //Write data back to pdf file
     $pdf2 = fopen ("C:/wamp64/www/Dylan/SAV/API_label/Commercial invoice/$filename4",'w');
     fwrite ($pdf2,$pdf_decoded);
     //close output file
     fclose ($pdf2);
    
     }
}


?>