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PHP 下载文件时如何自动添加bom头及解释BOM头和去掉bom头的方法_PHP

May 28, 2016 am 11:49 AM

PHP 下载文件时自动添加bom头,首先需要大家弄清楚,什么是bom头?在Windows下用记事本之类的程序将文本文件保存为UTF-8格式时,记事本会在文件头前面加上几个不可见的字符(EF BB BF),就是所谓的BOM(Byte order Mark)。

在utf-8编码文件中BOM在文件头部,占用三个字节,用来标示该文件属于utf-8编码,现在已经有很多软件识别bom头,但是还有些不能识别bom头,比如PHP就不能识别bom头,这也是用记事本编辑utf-8编码后执行就会出错的原因了。

不仅限于 记事本保存的文件,只要在文件的开口包含了EF BB BF 几个不可见的字符(十六进制应该是是xEFxBBxBF,用二进制编辑文件可见)。这像是一个约定俗成的东西,当系统看到这玩意的时候,就会觉得你这个文件是UTF-8编码的。

如果你的接口是UTF-8的,你需要强制下载一个文件,比如csv.excel在默认情况(中文背景)下,认为csv是GB编码的,所以如果米有bom头,那你给用户呈现的文件,可能就是乱码了。

怎么加bom头呢?

在输出文件之前加上bom头就可以了:

代码如下:

// 文件名
 $filename = "www.bitsCN.com .csv";
 header('Expires: ' . gmdate('D, d M Y H:i:s', $_SERVER['REQUEST_TIME'] + 10) . ' GMT');
 header('Cache-Control: max-age=10');
 //header('Content-Type: application/vnd.ms-excel; charset=utf-8');
 header('Content-Type: text/csv; charset=utf-8');
 header("Content-Disposition: attachment; filename={$filename}");
 // 如果结果中有提示信息,则把第一行输出改为提示信息文字
 $out = "xEFxBBxBF";// 加上bom头,系统自动默认为UTF-8编码
 if (!empty($extra['notice'])) {
 $out .= "{$extra['notice']}rn";
 }
 // 输出
 foreach ($table as $row) {
 $out .= implode(",", $row) . "rn";
 }
 /* if (mb_detect_encoding()($out) == 'UTF-8') {
 $out = iconv("UTF-8//IGNORE", "GBK", $out);
 } */
 echo $out; 
Copy after login

以下内容给大家介绍解释BOM头和去掉方法

去掉bom头的办法,简单的是下面两种:

1、editplus去BOM头的方法

编辑器调整为UTF8编码格式后,保存的文件前面会多出一串隐藏的字符(也即是BOM),用于编辑器识别这个文件是否是以UTF8编码。

运行Editplus,点击工具,选择首选项,选中文件,UTF-8标识选择 总是删除签名,然后对PHP文件编辑和保存后的PHP文件就是不带BOM的了。

2、ultraedit去除bom头办法

打开文件后,另存为选项的编码格式里选择(utf-8 无bom头),确定就ok了

怎么样,去掉bom头很简单吧

再来一段议论utf8的BOM信息的

BOM是指php文件本身的存储方式为带BOM的UTF-8,普通页面的中文乱码方式一般不是由这个原因导致的。

header("Content-type: text/html; charset=utf-8");
Copy after login

这句话控制html输出页面的编码方式,BOM只有在WINDOWS下采用“记事本”存储为UTF-8时才会有,这个可以用WINHEX把开始的2个字节删掉。

在dreamweaver里面编码设置里面可以设置是否带BOM,一般只要php输出的不是图片(GDI Stream),BOM都不会导致问题。

GDI Stream如果开头有了额外的 字符就会显示为 红叉。

以上内容给大家介绍了PHP 下载文件时自动添加bom头及解释BOM头和去掉方法,希望大家喜欢。

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