php - Why does the variable $token5 change 3 times when I run this script? -

attempting email address confirmation script. attempt contains 3 files: (email_token_test.php)
require_once (gen_email_token.php) require (phpmailer-master/phpmailerautoload.php)

i expecting variable $token5 contain 5 character string , string remain same through whole script. best of limited knowledge calling token generation function 1 time, doing several var_dumps on $token5 shows $token5 changing script progresses.

i know standard way of email address confirmation user registeration , database population, in instance user aren't signing in or registering. submitting email address quote request.

what doing wrong , how correct it? [php]

require_once "random_compat-2.0.10/lib/random.php";     include "password_compat-1.0.4/lib/password.php";      function generateemailtoken() {         try {         $string = random_bytes(32);         } catch (typeerror $e) {             // well, it's integer, unexpected.             die("an unexpected error has occurred");          } catch (error $e) {             // unexpected because 32 reasonable integer.             die("an unexpected error has occurred");         } catch (exception $e) {             // if message, csprng failed hard.             die("could not generate random string. our os secure?");         }          $myrandomstring = (bin2hex($string));          if($myrandomstring = (bin2hex($string))){         $randomtoken = password_hash($myrandomstring, password_bcrypt);             //return $randomtoken.'<br>';         }          if($randomtoken = password_hash($myrandomstring, password_bcrypt)){         $newrandomtoken = substr($randomtoken, 7);             //return $newrandomtoken.'<br>';         }          global $token5;          if($newrandomtoken = substr($randomtoken, 7)){         $token5 = substr($newrandomtoken, -5);             //return $token5.'<br>';         }          if($token5 = substr($newrandomtoken, -5)){             return $token5;         }      }   require_once "gen_email_token.php";     require "phpmailer-master/phpmailerautoload.php";     global $token5;     global $newemailtoken;     $newemailtoken = generateemailtoken();     var_dump($token5);      if(isset($_post['submit'])){         print_r($_post);          $postedemail = null;         if($_post['req-email']){             $postedemail = $_post['req-email'];         }          if(strlen($postedemail) === 0){             $errors[] = "you must enter email address.";         }          if(strlen($postedemail)<3){             $errors[] = "you have entered invalid email address.";         }           //  make sure "from" email address doesn't have nasty stuff in         $pattern = '/^(?!(?:(?:\x22?\x5c[\x00-\x7e]\x22?)|(?:\x22?[^\x5c\x22]\x22?)){255,})(?!(?:(?:\x22?\x5c[\x00-\x7e]\x22?)|(?:\x22?[^\x5c\x22]\x22?)){65,}@)(?:(?:[\x21\x23-\x27\x2a\x2b\x2d\x2f-\x39\x3d\x3f\x5e-\x7e]+)|(?:\x22(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|(?:\x5c[\x00-\x7f]))*\x22))(?:\.(?:(?:[\x21\x23-\x27\x2a\x2b\x2d\x2f-\x39\x3d\x3f\x5e-\x7e]+)|(?:\x22(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|(?:\x5c[\x00-\x7f]))*\x22)))*@(?:(?:(?!.*[^.]{64,})(?:(?:(?:xn--)?[a-z0-9]+(?:-[a-z0-9]+)*\.){1,126}){1,}(?:(?:[a-z][a-z0-9]*)|(?:(?:xn--)[a-z0-9]+))(?:-[a-z0-9]+)*)|(?:\[(?:(?:ipv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})|(?:(?!(?:.*[a-f0-9][:\]]){7,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?)))|(?:(?:ipv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){5}:)|(?:(?!(?:.*[a-f0-9]:){5,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3}:)?)))?(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))(?:\.(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))){3}))\]))$/id';          if (preg_match($pattern, trim(strip_tags($postedemail)))) {              $cleanedemail = trim(strip_tags($postedemail));              //echo '<span style="color:green;">success'.'&nbsp;'.'</span>'.'<b>'.$cleanedemail.'</b>'.'<span style="color:green;">'.'&nbsp;'.'is valid email.'.'<br>'.'</span>';             } else {                  $errors[] = "the email address entered invalid. please try again!";         }          $email = $cleanedemail;           if(!empty($errors)){              echo '<h1>error(s)!</h1>';             foreach($errors $errormessage){                 echo '<span style="color:red;">'.$errormessage .'</span>';             }         }          if(empty($errors)){              $message  = '<html><body>';             $message .= '<img src="http://res.cloudinary.com/dx1tairmq/image/upload/v1499127233/miles%20away%20travel/newmatlogo_small.png" alt="miles away travel">';             $message .= 'miles away travel has sent email verification code.';             $message .= '<table rules="all" style="border-color: #666;" cellpadding="10">';             $message .= "<tr><td><strong> verification code: </strong></td><td>"  . $token5 ."</td></tr>";             $message .= "</table>";             $message .= '<p>please enter code in email verification form</p>';             $message .= "</body></html>";              $mail = new phpmailer;              //$mail->smtpdebug = 1;                              // enable verbose debug output              $mail->issmtp();                                     // set mailer use smtp             $mail->host = 'smtp.gmail.com';                      // specify main , backup smtp servers             $mail->smtpauth = true;                                            $mail->username = 'xxxxxxxxx@gmail.com';            // set gmail email id             $mail->password = 'password';                           // gmail email password             $mail->smtpsecure = 'tls';                           // enable tls encryption, `ssl` accepted             $mail->port = 587;                                   // tcp port connect              $mail->setfrom('kentest894@gmail.com', 'miles away travel');             $mail->addaddress($email, 'ken smith');                         // add recipient             //$mail->addaddress('kenneth894@hotmail.com'  , 'k-man');       // name optional             $mail->addreplyto('friend_one_email_addess', 'information');               $mail->ishtml(true);                                  // set email format html              $mail->subject = 'email verification code';             $mail->body    = $message;             $mail->altbody = 'this body in plain text non-html mail clients';              if(!$mail->send()) {                 echo 'message not sent.';                 echo 'mailer error: ' . $mail->errorinfo;             } else {                 echo 'message has been sent'.'<br>';             }              var_dump($token5);              function buildform(){                 echo '<h3>your email address must verified quote submission.</h3>                     <form name="e-verify" method="post" action="email_token_test.php" id="form2">                         <h3>email verification form</h3><br>                          <label for="req-codefield">enter code here:</label>                         <input type="text" name="req-codefield" max length="5"/>                         <input type="submit" name="e-verify-submit" value="verify"/>                     </form>';             }              function show_form(){                 echo'<!doctype html>                     <html lang="en">                     <head>                         <link rel="stylesheet" href="form_show.css" type="text/css" media="all" />                     </head>                     <body>                         <div id="innerdiv">                         <?php buildform(); ?>                         </div>                     </body>                 </html>';             }              buildform();             show_form();         }          var_dump($token5);     }      if(isset($_post['e-verify-submit'])){         print_r($_post);         $errors = array();          $postedcode = null;         if($_post['req-codefield']){             $postedcode = $_post['req-codefield'];             $postedcode = trim(stripslashes($postedcode));         }          if(strlen($postedcode) === 0){             $errors[] = "you must enter verification code.";         }          if (strlen($postedcode) < 5 || strlen($postedcode) > 5) {             $errors[] ='verification code should contain 5 characters.';         }          if ($postedcode === $token5){             echo '<span style="color:green;">success email has been verified</span>';         }else{             echo '<span style="color:red;">email verification has failed. please contact phone.</span>';          }          var_dump($token5);     }[/php] 

[html]

<!doctype html> <html lang="en">     <head>         <meta charset="utf-8">         <link rel="stylesheet" href="form_show.css" type="text/css" media="all" />     </head>      <body>         <h1>email token test</h1>         <form name="e-mail" action="email_token_test.php" method="post" id="form1">             <label for="req-email">email*:</label>             <input type="email" id="req-email" name="req-email" required="required" minlength="3" value="" />             <br>             <br>             <input type="submit" name="submit" value="submit"/>         </form>     </body> </html> [/html