PHP removes BOM header from utf8 format file_PHP tutorial

We sometimes need to remove the header in utf8 documents and often need to clear it manually. Below I have compiled a few methods to use php programs to remove the BOM header in utf8 format files. I hope it will be helpful to all students.

Example 1

The code is as follows

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代码如下

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/**  * 去掉文件中的 bom头  * @var 0.1  * @author Chenwp  */ function clearbom($contents){        //UTF8 去掉文本中的 bom头     $BOM = chr(239).chr(187).chr(191);     return str_replace($BOM,'',$contents);    } /**  * 去掉文件中的bom头  * @param object $fileName Description  * @return object    Description  */ function clearfilebom($fileName){     $c = file_get_contents($fileName);     $c = clearbom($c);     file_put_contents($fileName,$c); }

/**
* Remove the bom header from the file
* @var 0.1
* @author Chenwp
​*/
function clearbom($contents){
//UTF8 removes the BOM header from the text
$BOM = chr(239).chr(187).chr(191);
Return str_replace($BOM,'',$contents);
}

/**
* Remove the BOM header from the file
* @param object $fileName Description
* @return object Description
​*/
function clearfilebom($fileName){
$c = file_get_contents($fileName);
$c = clearbom($c);
File_put_contents($fileName,$c);
}

Example 2

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//此文件用于快速测试UTF8编码的文件是不是加了BOM，并可自动移除 $basedir="."; //修改此行为需要检测的目录，点表示当前目录 $auto=1; //是否自动移除发现的BOM信息。1为是，0为否。 //以下不用改动 if ($dh = opendir($basedir)) { while (($file = readdir($dh)) !== false) { if ($file!='.' && $file!='..' && !is_dir($basedir."/".$file)) echo "filename: $file ".checkBOM("$basedir/$file")." ";        }        closedir($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, $rest);                   return ("BOM found, automatically removed.");             } else {                   return ("BOM found.");             }         }          else return ("BOM Not Found."); } function rewrite ($filename, $data) {         $filenum=fopen($filename,"w");         flock($filenum,LOCK_EX);         fwrite($filenum,$data);         fclose($filenum); } //结束 ?>

How to convert the format with BOM file into unsigned UTF-8 format file? Let me share with you a piece of PHP code:

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<🎜>//This file is used to quickly test whether the UTF8 encoded file has a BOM added and can be automatically removed <🎜> <🎜>$basedir="."; //Modify the directory that needs to be detected for this behavior. The dot indicates the current directory $auto=1; //Whether to automatically remove the discovered BOM information. 1 means yes, 0 means no. <🎜> <🎜>//No need to change the following <🎜> <🎜>if ($dh = opendir($basedir)) { ​​​​while (($file = readdir($dh)) !== false) { if ($file!='.' && $file!='..' && !is_dir($basedir."/".$file)) echo "filename: $file ".checkBOM("$basedir/$file" )." "; }        closedir($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, $rest); Return ("BOM found, automatically removed.");                } else { Return ("BOM found.");              }                                                       else return ("BOM Not Found."); } function rewrite ($filename, $data) {           $filenum=fopen($filename,"w"); flock($filenum,LOCK_EX);            fwrite($filenum,$data);            fclose($filenum); } //End ?>

Example 3

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代码如下

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// 设定你要清除BOM的根目录（会自动扫描所有子目录和文件） $HOME = dirname(__FILE__); // 如果是Windows系统，修改为：$WIN = 1; $WIN = 0; ?> $BOMBED = array(); RecursiveFolder($HOME); echo ' These files had UTF8 BOM, but i cleaned them: '; foreach ($BOMBED as $utf) { echo $utf ." n"; } echo ' '; // 递归扫描 function RecursiveFolder($sHOME) {  global $BOMBED, $WIN;  $win32 = ($WIN == 1) ? "" : "/";  $folder = dir($sHOME);  $foundfolders = array();  while ($file = $folder->read()) {   if($file != "." and $file != "..") {    if(filetype($sHOME . $win32 . $file) == "dir"){     $foundfolders[count($foundfolders)] = $sHOME . $win32 . $file;    } else {     $content = file_get_contents($sHOME . $win32 . $file);     $BOM = SearchBOM($content);     if ($BOM) {      $BOMBED[count($BOMBED)] = $sHOME . $win32 . $file;      // 移出BOM信息      $content = substr($content,3);      // 写回到原始文件      file_put_contents($sHOME . $win32 . $file, $content);     }    }   }  }  $folder->close();  if(count($foundfolders) > 0) {   foreach ($foundfolders as $folder) {    RecursiveFolder($folder, $win32);   }  } } // 搜索当前文件是否有BOM function SearchBOM($string) {   if(substr($string,0,3) == pack("CCC",0xef,0xbb,0xbf)) return true;   return false; } ?>

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//Set the root directory where you want to clear the BOM (all subdirectories and files will be automatically scanned)
$HOME = dirname(__FILE__);
// If it is a Windows system, change it to: $WIN = 1;
$WIN = 0;
?>








$BOMBED = array();
RecursiveFolder($HOME);
echo '

These files had UTF8 BOM, but i cleaned them:

';
foreach ($BOMBED as $utf) { echo $utf ."
n"; }
echo '

';
// Recursive scan
function RecursiveFolder($sHOME) {
global $BOMBED, $WIN;
$win32 = ($WIN == 1) ? "" : "/";
$folder = dir($sHOME);
$foundfolders = array();
while ($file = $folder->read()) {
if($file != "." and $file != "..") {
if(filetype($sHOME . $win32 . $file) == "dir"){
$foundfolders[count($foundfolders)] = $sHOME . $win32 . $file;
} else {
$content = file_get_contents($sHOME . $win32 . $file);
$BOM = SearchBOM($content);
If ($BOM) {
$BOMBED[count($BOMBED)] = $sHOME . $win32 . $file;
//Remove BOM information
$content = substr($content,3);
//Write back to original file
File_put_contents($sHOME . $win32 . $file, $content);
}
}
}
}
$folder->close();
if(count($foundfolders) > 0) {
foreach ($foundfolders as $folder) {
RecursiveFolder($folder, $win32);
}
}
}
// Search if the current file has a BOM
function SearchBOM($string) {
if(substr($string,0,3) == pack("CCC",0xef,0xbb,0xbf)) return true;
return false;
}
?>

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TechArticle

We sometimes need to remove the header in utf8 documents. We often need to clear it manually. Below I have compiled a few uses How to use PHP program to clear the BOM header in UTF8 format files. I hope this will help everyone...