PHP method to remove BOM headers from project files in batches

This article mainly introduces the method of removing BOM headers from project files in batches in PHP. It has certain reference value. Now I share it with you. Friends in need can refer to it.

 1 ";
 18                 } else {
 19                     $dirname = $basedir . "/" . $file;
 20                     checkdir($dirname);
 21                 }
 22             }
 23         }
 24         closedir($dh);
 25     }
 26 }
 27 
 28 function checkBOM($filename)
 29 {
 30     global $auto;
 31     $contents = file_get_contents($filename);
 32     $charset[1] = substr($contents, 0, 1);
 33     $charset[2] = substr($contents, 1, 1);
 34     $charset[3] = substr($contents, 2, 1);
 35     if (ord($charset[1]) == 239 && ord($charset[2]) == 187 && ord($charset[3]) == 191) {
 36         if ($auto == 1) {
 37             $rest = substr($contents, 3);
 38             rewrite($filename, $rest);
 39             return ("BOM found, automatically removed.");
 40         } else {
 41             return ("BOM found.");
 42         }
 43     } else
 44         return ("BOM Not Found.");
 45 }
 46 
 47 function rewrite($filename, $data)
 48 {
 49     $filenum = fopen($filename, "w");
 50     flock($filenum, LOCK_EX);
 51     fwrite($filenum, $data);
 52     fclose($filenum);
 53 }
 54 
 55 ?>

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