问如何在重定向后更改代码以使Captcha正常工作

EN

 <?php
  session_start();
  //Send a generated image to the browser 
  create_image(); 
  exit();

 header("Content-type: image/png");
 function create_image(){
 $x = 98;
 $y = 45;
 $im = imagecreate($x,$y);
 $bgcolor=imagecolorallocate($im,13,17,25);


 $text_color = imagecolorallocate($im,255, 255, 210);

function rand_string( $length ) {
$chars = "abcdklmnopqrstuvwxyzABCDEF0123456789GHIJKefghijLMNPQRSTUVWXYZ0123456789"; 
$str ="";
$size = strlen( $chars );
for( $i = 0; $i < $length; $i++ ) {
    $str .= $chars[ rand( 0, $size - 1 ) ];
}

   return $str;
}

 $text=rand_string(rand(1,2));
 $_SESSION['security_code']=strtolower($text);

 imagettftext($im, 24, 3, 2, 32, $text_color, "fonts/grade.ttf", $text);
 $color = imagecolorallocate($im, 255,222, 255);


for($i =2; $i < 55; $i+=mt_rand(2,6)) {
  for($j =4; $j < 45; $j+=mt_rand(1,5)) {
  
    imagesetpixel($im, $i,$j, $color);
 }

  } 
        
  imagejpeg($im);
  imagedestroy($im);
  }
?>

 <img id="imgCaptcha" src="Captcha.php" style="float: right;" />

  RewriteEngine on
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule ^ index.php [L]