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PHP prevent external form submission

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Release： 2016-07-25 08:42:13
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[PHP] code

  1. $referer = isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : NULL;
  2. $host = $_SERVER['HTTP_HOST'];
  3. echo 'Submitted address:'. $referer;
  4. echo '
    ';
  5. echo 'This site's domain name: '.$host;
  6. echo '
    ';
  7. echo substr($referer,7,strlen($host));
  8. if(substr($referer,7,strlen($host)) != $host){
  9. echo 'illegal operation';
  10. }else{
  11. echo 'normal operation';
  12. }
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Related labels：
PHP 防止外部提交表单
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