PHP 批量去除BOM頭

//去除BOM頭解決方法:
<?php
ini_set('memory_limit','1024M'); 
function checkdir($basedir) {    
    if ($dh = opendir ( $basedir )) {    
        while ( ($file = readdir ( $dh )) !== false ) {    
            if ($file != '.' && $file != '..') {    
                if (! is_dir ( $basedir . "/" . $file )) { // 如果是文件    
                    echo "filename: $basedir/$file " . checkBOM ( "$basedir/$file" ) . " <br>";    
                } else {    
                    $dirname = $basedir . "/" .$file; // 如果是目錄    
                    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 ( $charset [3] ) == 191) { // BOM 的前三個字符的ASCII 碼分別爲 239 187 191    
        if ($auto == 1) {    
            $rest = substr ( $contents, 3 );    
            rewrite ( $filename, $rest );    
            return ("<font color=red>BOM found, automatically removed.</font>");    
        } else {    
            return ("<font color=red>BOM found.</font>");    
        }    
    } else   
        return ("BOM Not Found.");    
}    

function rewrite($filename, $data) {    
    $filenum = fopen ( $filename, "w" );    
    flock ( $filenum, LOCK_EX );    
    fwrite ( $filenum, $data );    
    fclose ( $filenum );    
} 

$auto=1;
$dir='D:/web/';//項目文件路徑
checkDir($dir);
?
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原文鏈接：https://blog.csdn.net/websites/article/details/78958715