我的联系表格上的一些字符问题

Question

我的联系表格遇到了一个奇怪的问题。它已经工作了一段时间，但最近我收到一些破碎的消息，当人们使用非普通字符，如ä，ö或å。所以，总结一下，有时候它会起作用，有时却不起作用，这个问题最近才开始发生。我会留下你的PHP代码进行表单处理，但它有超过200行。 I can leave you instead the link of where did I get it from.（文件上传的顶部第二个表单）

如果您需要我在此处粘贴代码，请告诉我。

希望你能告诉我问题是什么。非常感谢提前！

更新

经过一番调查后，我得出的结论是，，ö和å字符不在我用于联系表格的utf-8列表中。奇怪，因为就像我说的那样，我现在有几个月的在线形式，直到最近我才开始遇到问题。另外，我在同一网站的其他联系表单中使用相同的字符编码（utb-8），我在那里也没有遇到同样的问题。

更新2

<?PHP
/*
    Contact Form from Freegive

    This program is free software published under the
    terms of the GNU Lesser General Public License.

This program is distributed in the hope that it will
be useful - WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

@copyright freegive.co.uk 2010
*/
require_once("class.phpmailer.php");

/*
Interface to Captcha handler
*/
class FG_CaptchaHandler
{
    function Validate() { return false;}
    function GetError(){ return '';}
}
/*
FGContactForm is a general purpose contact form class
It supports Captcha, HTML Emails, sending emails
conditionally, File atachments and more.
*/
class FGContactForm
{
    var $receipients;
    var $errors;
    var $error_message;
    var $name;
    var $email;
    var $age;
    var $experience;
    var $message;
    var $from_address;
    var $form_random_key;
    var $conditional_field;
    var $arr_conditional_receipients;
    var $fileupload_fields;
    var $captcha_handler;
    var $mailer;

    function FGContactForm()
    {
        $this->receipients = array();
        $this->errors = array();
        $this->form_random_key = 'HTgsjhartag';
        $this->conditional_field='';
        $this->arr_conditional_receipients=array();
        $this->fileupload_fields=array();
        $this->mailer = new PHPMailer();
        $this->mailer->CharSet = 'utf-8';
    }

    function EnableCaptcha($captcha_handler)
    {
        $this->captcha_handler = $captcha_handler;
        session_start();
    }

    function AddRecipient($email,$name="")
    {
        $this->mailer->AddAddress($email,$name);
    }

    function SetFromAddress($from)
    {
        $this->from_address = $from;
    }
    function SetFormRandomKey($key)
    {
        $this->form_random_key = $key;
    }
    function GetSpamTrapInputName()
    {
        return 'sp'.md5('KHGdnbvsgst'.$this->GetKey());
    }
    function SafeDisplay($value_name)
    {
        if(empty($_POST[$value_name]))
        {
            return'';
        }
        return htmlentities($_POST[$value_name]);
    }
    function GetFormIDInputName()
    {
        $rand = md5('TygshRt'.$this->GetKey());

        $rand = substr($rand,0,20);
        return 'id'.$rand;
    }


    function GetFormIDInputValue()
    {
        return md5('jhgahTsajhg'.$this->GetKey());
    }

    function SetConditionalField($field)
    {
        $this->conditional_field = $field;
    }
    function AddConditionalReceipent($value,$email)
    {
        $this->arr_conditional_receipients[$value] =  $email;
    }

    function AddFileUploadField($file_field_name,$accepted_types,$max_size)
    {

        $this->fileupload_fields[] =
            array("name"=>$file_field_name,
            "file_types"=>$accepted_types,
            "maxsize"=>$max_size);
    }

    function ProcessForm()
    {
        if(!isset($_POST['submitted']))
        {
           return false;
        }
        if(!$this->Validate())
        {
            $this->error_message = implode('<br/>',$this->errors);
            return false;
        }
        $this->CollectData();

        $ret = $this->SendFormSubmission();

        return $ret;
    }

    function RedirectToURL($url)
    {
        header("Location: $url");
        exit;
    }

    function GetErrorMessage()
    {
        return $this->error_message;
    }
    function GetSelfScript()
    {
        return htmlentities($_SERVER['PHP_SELF']);
    }

    function GetName()
    {
        return $this->name;
    }
    function GetEmail()
    {
        return $this->email;
    }
    function GetMessage()
    {
        return htmlentities($this->message,ENT_QUOTES,"UTF-8");
    }

/*--------  Private (Internal) Functions -------- */

    function SendFormSubmission()
    {
        $this->CollectConditionalReceipients();

        $this->mailer->CharSet = 'utf-8';

        $this->mailer->Subject = "Bio skickade till Vidösternsimmet från $this->name";

        $this->mailer->From = $this->GetFromAddress();

        $this->mailer->FromName = $this->name;

        $this->mailer->AddReplyTo($this->email);

        $message = $this->ComposeFormtoEmail();

        $textMsg = trim(strip_tags(preg_replace('/<(head|title|style|script)[^>]*>.*?<\/\\1>/s','',$message)));
        $this->mailer->AltBody = @html_entity_decode($textMsg,ENT_QUOTES,"UTF-8");
        $this->mailer->MsgHTML($message);

        $this->AttachFiles();

        if(!$this->mailer->Send())
        {
            $this->add_error('<div class="alert-box alert">Fel! Skickande av meddelandet misslyckades. Vänligen försök igen!<a href="" class="close">&times;</a></div>');
            return false;
        }

        return true;
    }

    function CollectConditionalReceipients()
    {
        if(count($this->arr_conditional_receipients)>0 &&
          !empty($this->conditional_field) &&
          !empty($_POST[$this->conditional_field]))
        {
            foreach($this->arr_conditional_receipients as $condn => $rec)
            {
                if(strcasecmp($condn,$_POST[$this->conditional_field])==0 &&
                !empty($rec))
                {
                    $this->AddRecipient($rec);
                }
            }
        }
    }

    /*
    Internal variables, that you donot want to appear in the email
    Add those variables in this array.
    */
    function IsInternalVariable($varname)
    {
        $arr_interanl_vars = array('scaptcha',
                            'submitted',
                            $this->GetSpamTrapInputName(),
                            $this->GetFormIDInputName()
                            );
        if(in_array($varname,$arr_interanl_vars))
        {
            return true;
        }
        return false;
    }

    function FormSubmissionToMail()
    {
        $ret_str='';
        foreach($_POST as $key=>$value)
        {
            if(!$this->IsInternalVariable($key))
            {
                $value = htmlentities($value,ENT_QUOTES,"UTF-8");
                $value = nl2br($value);
                $key = ucfirst($key);
                $ret_str .= "<div class='label'><strong>$key: </strong> $value </div>\n\n";
            }
        }
        foreach($this->fileupload_fields as $upload_field)
        {
            $field_name = $upload_field["name"];
            if(!$this->IsFileUploaded($field_name))
            {
                continue;
            }        

            $filename = basename($_FILES[$field_name]['name']);

            $ret_str .= "<div class='label'><strong>Avatar skickade:</strong> '$field_name' : $filename </div>\n";
        }
        return $ret_str;
    }

    function ExtraInfoToMail()
    {
        $ret_str='';

        $ip = $_SERVER['REMOTE_ADDR'];
        $ret_str = "<div class='label'>IP adress från sändare:</div><div class='value'>$ip</div>\n";

        return $ret_str;
    }

    function GetMailStyle()
    {
        $retstr = "\n<style>".
        "body,.label,.value { font-family:Arial,Verdana; } ".
        ".label {font-weight:bold; margin-top:5px; font-size:1em; color:#333;} ".
        ".value {margin-bottom:15px;font-size:0.8em;padding-left:5px;} ".
        "</style>\n";

        return $retstr;
    }
    function GetHTMLHeaderPart()
    {
         $retstr = '<!DOCTYPE html">'."\n".
                   '<html><head><title></title>'.
                   '<meta charset="utf-8" />';
         $retstr .= $this->GetMailStyle();
         $retstr .= '</head><body>';
         return $retstr;
    }
    function GetHTMLFooterPart()
    {
        $retstr ='</body></html>';
        return $retstr ;
    }
    function ComposeFormtoEmail()
    {
        $header = $this->GetHTMLHeaderPart();
        $formsubmission = $this->FormSubmissionToMail();
        $extra_info = $this->ExtraInfoToMail();
        $footer = $this->GetHTMLFooterPart();

        $message = $header."<h1>Ny Bio inför Vidösternsimmet:</h1><p>$formsubmission</p><hr/>$extra_info".$footer;

        return $message;
    }

    function AttachFiles()
    {
        foreach($this->fileupload_fields as $upld_field)
        {
            $field_name = $upld_field["name"];
            if(!$this->IsFileUploaded($field_name))
            {
                continue;
            }

            $filename =basename($_FILES[$field_name]['name']);

            $this->mailer->AddAttachment($_FILES[$field_name]["tmp_name"],$filename);
        }
    }

    function GetFromAddress()
    {
        if(!empty($this->from_address))
        {
            return $this->from_address;
        }

        $host = $_SERVER['SERVER_NAME'];

        $from ="bio_svara_inte@$host";
        return $from;
    }

    function Validate()
    {
        $ret = true;
        //security validations
        if(empty($_POST[$this->GetFormIDInputName()]) ||
          $_POST[$this->GetFormIDInputName()] != $this->GetFormIDInputValue() )
        {
            //The proper error is not given intentionally
            $this->add_error('<div class="alert-box alert">Automated submission prevention: case 1 failed<a href="" class="close">&times;</a></div>');
            $ret = false;
        }

        //This is a hidden input field. Humans won't fill this field.
        if(!empty($_POST[$this->GetSpamTrapInputName()]) )
        {
            //The proper error is not given intentionally
            $this->add_error('<div class="alert-box alert">Automated submission prevention: case 2 failed<a href="" class="close">&times;</a></div>');
            $ret = false;
        }

        //experience validations
        if(empty($_POST['experience']))
        {
            $this->add_error('<div class="alert-box alert">Vänligen skriv en erfarenhet nivå!<a href="" class="close">&times;</a></div>');
            $ret = false;
        }
        else
        if(strlen($_POST['experience'])>50)
        {
            $this->add_error('<div class="alert-box alert">Vänligen försök att beskriva din erfarenhet nivå med ett eller två ord!<a href="" class="close">&times;</a></div>');
            $ret = false;
        }

        //age validations
        if(empty($_POST['age']))
        {
            $this->add_error('<div class="alert-box alert">Vänligen skriv en ålder!<a href="" class="close">&times;</a></div>');
            $ret = false;
        }
        else
        if(strlen($_POST['age'])>3)
        {
            $this->add_error('<div class="alert-box alert">Det är osannolikt att du är mer än 99 år gammal och kan faktiskt simma 21+ Km! Vänligen skriv din verkliga ålder<a href="" class="close">&times;</a></div>');
            $ret = false;
        }

        //name validations
        if(empty($_POST['name']))
        {
            $this->add_error('<div class="alert-box alert">Vänligen skriv ett namn!<a href="" class="close">&times;</a></div>');
            $ret = false;
        }
        else
        if(strlen($_POST['name'])>50)
        {
            $this->add_error('<div class="alert-box alert">Ditt namn är för lång. Vänligen använd en förkortning!<a href="" class="close">&times;</a></div>');
            $ret = false;
        }

        //email validations
        if(empty($_POST['email']))
        {
            $this->add_error('<div class="alert-box alert">Vänligen ange en e-post adress<a href="" class="close">&times;</a></div>');
            $ret = false;
        }
        else
        if(strlen($_POST['email'])>50)
        {
            $this->add_error('<div class="alert-box alert">Email address is too big!<a href="" class="close">&times;</a></div>');
            $ret = false;
        }
        else
        if(!$this->validate_email($_POST['email']))
        {
            $this->add_error('<div class="alert-box alert">Vänligen ange en giltig e-post adrerss<a href="" class="close">&times;</a></div>');
            $ret = false;
        }

        //message validaions
        if(strlen($_POST['message'])>3048)
        {
            $this->add_error('<div class="alert-box alert">Meddelandet är för stort. Försök att ladda upp en mindre avatar!<a href="" class="close">&times;</a></div>');
            $ret = false;
        }

        //captcha validaions
        if(isset($this->captcha_handler))
        {
            if(!$this->captcha_handler->Validate())
            {
                $this->add_error($this->captcha_handler->GetError());
                $ret = false;
            }
        }
        //file upload validations
        if(!empty($this->fileupload_fields))
        {
         if(!$this->ValidateFileUploads())
         {
            $ret = false;
         }
        }
        return $ret;
    }

    function ValidateFileType($field_name,$valid_filetypes)
    {
        $ret=true;
        $info = pathinfo($_FILES[$field_name]['name']);
        $extn = $info['extension'];
        $extn = strtolower($extn);

        $arr_valid_filetypes= explode(',',$valid_filetypes);
        if(!in_array($extn,$arr_valid_filetypes))
        {
            $this->add_error('<div class="alert-box alert">Tillåtna filer är: $valid_filetypes<a href="" class="close">&times;</a></div>');
            $ret=false;
        }
        return $ret;
    }

    function ValidateFileSize($field_name,$max_size)
    {
        $size_of_uploaded_file =
                $_FILES[$field_name]["size"]/2524;//size in KBs
        if($size_of_uploaded_file > $max_size)
        {
            $this->add_error('<div class="alert-box alert">Din avatar är alldelles för stort. Vänligen välj ett avatar som är mindre än $max_size KB<a href="" class="close">&times;</a></div>');
            return false;
        }
        return true;
    }

    function IsFileUploaded($field_name)
    {
        if(empty($_FILES[$field_name]['name']))
        {
            return false;
        }
        if(!is_uploaded_file($_FILES[$field_name]['tmp_name']))
        {
            return false;
        }
        return true;
    }
    function ValidateFileUploads()
    {
        $ret=true;
        foreach($this->fileupload_fields as $upld_field)
        {
            $field_name = $upld_field["name"];

            $valid_filetypes = $upld_field["file_types"];

            if(!$this->IsFileUploaded($field_name))
            {
                continue;
            }

            if($_FILES[$field_name]["error"] != 0)
            {
                $this->add_error('<div class="alert-box alert">Fel under avatars uppladdningen process; Error code:<a href="" class="close">&times;</a></div>'.$_FILES[$field_name]["error"]);
                $ret=false;
            }

            if(!empty($valid_filetypes) &&
             !$this->ValidateFileType($field_name,$valid_filetypes))
            {
                $ret=false;
            }

            if(!empty($upld_field["maxsize"]) &&
            $upld_field["maxsize"]>0)
            {
                if(!$this->ValidateFileSize($field_name,$upld_field["maxsize"]))
                {
                    $ret=false;
                }
            }

        }
        return $ret;
    }

    function StripSlashes($str)
    {
        if(get_magic_quotes_gpc())
        {
            $str = stripslashes($str);
        }
        return $str;
    }
    /*
    Sanitize() function removes any potential threat from the
    data submitted. Prevents email injections or any other hacker attempts.
    if $remove_nl is true, newline chracters are removed from the input.
    */
    function Sanitize($str,$remove_nl=true)
    {
        $str = $this->StripSlashes($str);

        if($remove_nl)
        {
            $injections = array('/(\n+)/i',
                '/(\r+)/i',
                '/(\t+)/i',
                '/(%0A+)/i',
                '/(%0D+)/i',
                '/(%08+)/i',
                '/(%09+)/i'
                );
            $str = preg_replace($injections,'',$str);
        }

        return $str;
    }

    /*Collects clean data from the $_POST array and keeps in internal variables.*/
    function CollectData()
    {
        $this->name = $this->Sanitize($_POST['name']);
        $this->email = $this->Sanitize($_POST['email']);

        /*newline is OK in the message.*/
        $this->message = $this->StripSlashes($_POST['message']);
    }

    function add_error($error)
    {
        array_push($this->errors,$error);
    }
    function validate_email($email)
    {
        return eregi("^[_\.0-9a-zA-Z-]+@([0-9a-zA-Z][0-9a-zA-Z-]+\.)+[a-zA-Z]{2,6}$", $email);
    }

    function GetKey()
    {
        return $this->form_random_key.$_SERVER['SERVER_NAME'].$_SERVER['REMOTE_ADDR'];
    }

}

?>

Answer 1

经过漫长而耐心的调试后，我在代码中找不到任何错误。因此，我决定与托管网站的托管公司联系，并寻求一些指导。他们还查看了代码并说它似乎一切都好。经过一番聊天，我们得出的结论是，这个问题的最可能原因是使用了来自用户和管理员的非常旧的浏览器/电子邮件客户端 - 我知道是这种情况。

这可能不是正确的答案，但它是迄今为止更适合这种情况的答案，因为正如我之前所说，这是一个不会一直发生但只是有时发生的问题。管理员有时使用他非常旧的工作计算机（使用非常旧的操作系统和浏览器）来阅读该网站中通过表单传入的消息。因此，我会接受这个作为正确的答案！

如果有人有更好的解释，我全都听见了......