从导入的 .csv 文件中删除 BOM (ï»¿)

Question

我想从我导入的文件中删除 BOM，但它似乎不起作用。

我试过 preg_replace('/[\x00-\x1F\x80-\xFF]/', '', $file); 和 str_replace。

我希望有人看到我做错了什么。

$filepath = get_bloginfo('template_directory')."/testing.csv";
            setlocale(LC_ALL, 'nl_NL');
            ini_set('auto_detect_line_endings',TRUE);
            $file = fopen($filepath, "r") or die("Error opening file");
            $i = 0;
            while(($line = fgetcsv($file, 1000, ";")) !== FALSE) {
                if($i == 0) {
                    $c = 0;
                    foreach($line as $col) {
                        $cols[$c] = utf8_encode($col);
                        $c++;
                    }
                } else if($i > 0) {
                    $c = 0;
                    foreach($line as $col) {
                        $data[$i][$cols[$c]] = utf8_encode($col);
                        $c++;
                    }
                }
                $i++;
            }

------------
已解决的版本：

setlocale(LC_ALL, 'nl_NL');
ini_set('auto_detect_line_endings',TRUE);
require_once(ABSPATH.'wp-admin/includes/file.php' );

$path = get_home_path();        
$filepath = $path .'wp-content/themes/pon/testing.csv';
$content = file_get_contents($filepath); 
file_put_contents($filepath, str_replace("\xEF\xBB\xBF",'', $content));

// FILE_PUT_CONTENTS AUTOMATICCALY CLOSES THE FILE
$file = fopen($filepath, "r") or die("Error opening file"); 

$i = 0;
while(($line = fgetcsv($file, 1000, ";")) !== FALSE) {
    if($i == 0) {
        $c = 0;
        foreach($line as $col) {
            $cols[$c] = $col;
            $c++;
        }
    } else if($i > 0) {
        $c = 0;
        foreach($line as $col) {
            $data[$i][$cols[$c]] = $col;
            $c++;
        }
    }
    $i++;
}

我发现它删除了 BOM 并通过用新数据覆盖它来调整文件。问题是我的脚本的其余部分不再起作用，我不明白为什么。这是一个新的 .csv 文件

Answer 1

用file_get_contents读取数据然后用mb_convert_encoding转换成UTF-8

更新

$filepath = get_bloginfo('template_directory')."/testing.csv";
$fileContent = file_get_contents($filepath);
$fileContent = mb_convert_encoding($fileContent, "UTF-8");
$lines = explode("\n", $fileContent);
foreach($lines as $line) {
    $conls = explode(";", $line);
    // etc...
}

Answer 2

试试这个：

function removeBomUtf8($s){
  if(substr($s,0,3)==chr(hexdec('EF')).chr(hexdec('BB')).chr(hexdec('BF'))){
       return substr($s,3);
   }else{
       return $s;
   }
}

Answer 3

如果字符编码函数对您不起作用（在某些情况下对我来说就是这种情况）并且您知道您的文件总是有 BOM，您可以简单地使用 fseek() 来跳过前 3 个字节，这是 BOM 的长度。

$fp = fopen("testing.csv", "r");
fseek($fp, 3);

您也不应该使用 explode() 来拆分 CSV 行和列，因为如果您的列包含您用来拆分的字符，您将得到不正确的结果。改用这个：

while (!feof($fp)) {
    $arrayLine = fgetcsv($fp, 0, ";", '"');
    ...
}

Answer 4

使用 as the main inspiration for this, and :

// Strip byte order marks from a string
function strip_bom($string, $type = 'utf8') {
    $length = 0;

    switch($type) {
        case 'utf8':
            $length = substr($string, 0, 3) === chr(0xEF) . chr(0xBB) . chr(0xBF) ? 3 : 0;
        break;

        case 'utf16_little_endian':
            $length = substr($string, 0, 2) === chr(0xFF) . chr(0xFE) ? 2 : 0;
        break;
    }

    return $length ? substr($string, $length) : $string;
}

Answer 5

BOM 是否可以为您提供有关如何将输入重新编码为您 script/app/database 需要的内容的线索？只是删除是没有用的。

这就是我强制将字符串（从具有 file_get_contents() 的文件中提取）以 UTF-8 编码并去掉 BOM 的方法：

switch (true) { 
    case (substr($string,0,3) == "\xef\xbb\xbf") :
        $string = substr($string, 3);
        break;
    case (substr($string,0,2) == "\xfe\xff") :                            
        $string = mb_convert_encoding(substr($string, 2), "UTF-8", "UTF-16BE");
        break;
    case (substr($string,0,2) == "\xff\xfe") :                            
        $string = mb_convert_encoding(substr($string, 2), "UTF-8", "UTF-16LE");
        break;
    case (substr($string,0,4) == "\x00\x00\xfe\xff") :
        $string = mb_convert_encoding(substr($string, 4), "UTF-8", "UTF-32BE");
        break;
    case (substr($string,0,4) == "\xff\xfe\x00\x00") :
        $string = mb_convert_encoding(substr($string, 4), "UTF-8", "UTF-32LE");
        break;
    default:
        $string = iconv(mb_detect_encoding($string, mb_detect_order(), true), "UTF-8", $string);
};

Answer 6

正确的方法是跳过 BOM（如果存在于文件中）(https://www.php.net/manual/en/function.fgetcsv.php#122696)：

ini_set('auto_detect_line_endings',TRUE);
$file = fopen($filepath, "r") or die("Error opening file");
if (fgets($file, 4) !== "\xef\xbb\xbf") //Skip BOM if present
        rewind($file); //Or rewind pointer to start of file

$i = 0;
while(($line = fgetcsv($file, 1000, ";")) !== FALSE) {
    ...
}

Answer 7

检查这个解决方案，这解决了我的问题：https://www.php.net/manual/en/function.str-getcsv.php#116763

$bom = pack('CCC', 0xEF, 0xBB, 0xBF);
if (strncmp($yourString, $bom, 3) === 0) {
    $body = substr($yourString, 3);
}

从导入的 .csv 文件中删除 BOM (ï»¿)

Remove BOM (ï»¿) from imported .csv file

php

csv

import

fgetcsv

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