One-click removal of webpage BOM attribute [Solve garbled text, leading blank space, and verification code not displaying issues]

Several frequently encountered issues:

1. The website opens blank.

2. Extra blank space appears at the top of the page.

3. The website displays garbled characters, such as “锘�”.

4. The admin login captcha does not display. 

Solutions:

1. Use a professional editor, such as Notepad++, Sublime, or EditPlus; these will not automatically add a BOM signature.

2. In Sublime, go to File -> Save with Encoding -> UTF-8. After saving, the BOM can be removed.

3. In Notepad++, select Format -> Encode in UTF-8 to remove it.

4. Use the following method to remove the BOM from all text files in the website in one go. 

Copy the following code

<?php  
$dir=dirname(__FILE__);
if(isset($_GET["act"]) && $_GET["act"] == "del" ){   //Del the file!!
$filename=basename($_SERVER['PHP_SELF']);
@unlink($filename);
exit('Error:File Not Found!');
}
echo "The document:".$dir."&nbsp;&nbsp;<a href=\"?act=del\" >[Del the delbom.php file]</a><BR/>";
if (!is_dir($dir))
die("$dir not exists");
$auto = 1;  
checkdir($dir);  
function checkdir($basedir){  
if ($dh = opendir($basedir)) {  
  while (($file = readdir($dh)) !== false) {  
   if ($file != '.' && $file != '..'){  
    if (!is_dir($basedir."/".$file)) {  
     echo "filename: $basedir/$file ".checkBOM("$basedir/$file")."<BR/>\n";  
    }else{  
     $dirname = $basedir."/".$file;  
     checkdir($dirname);  
    }  
   }  
  }  
closedir($dh);  
}  
} 
function checkBOM ($filename) {  
global $auto;  
$contents = file_get_contents($filename);  
$charset[1] = substr($contents, 0, 1);  
$charset[2] = substr($contents, 1, 1);  
$charset[3] = substr($contents, 2, 1);  
if (ord($charset[1]) == 239 && ord($charset[2]) == 187 && ord($charset[3]) == 191) {  
  if ($auto == 1) {  
   $rest = substr($contents, 3);  
   rewrite ($filename, $rest);  
   return ("<font color=red> BOM found, automatically removed.</font>\n");  
  } else {  
   return ("<font color=red>BOM found.</font>\n");  
  }  
}  
else return ("BOM Not Found.\n");  
}  
function rewrite ($filename, $data) {  
$filenum = fopen($filename, "w");  
flock($filenum, LOCK_EX);  
fwrite($filenum, $data);  
fclose($filenum);  
}  
?>

Copy the above code

Usage: Copy the above code into a newly created delbom.php file (open this file with Notepad or another text editor), upload it to the root directory of your website, then visit your site, for example http://www.**.com/delbom.php to clean all BOM tags present in the web pages.