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php生成的html meta和link标记在body标签里 顶部有个空行

Jun 06, 2016 pm 08:33 PM
php

php生成的html meta和link标记在body标签里 浏览器顶部有个空行的解决方法。

1.php中用smarty模板生成的html在浏览器中顶部有一空行.

2.用firedebug发现 meta和link标记在body标签里.

本机上wmap运行没事, 送到远程服务器上是IASP的服务, 会出现上述bug.

看了下源文件, 文本一样的. 但保存时提示编码问题.估计是utf-8问题了.

在网上找了下, 是utf-8 BOM问题.

解决方法: 用UltraEdit32把smarty模板文件即引用的模板文件(如include的header,footer等文件)全另存为无BOM的utf-8文件.

其它补充说明:

页面采用UTF8编码,头部和尾部用了模板包含文档的method,结果头部和尾部无端端各多出一个约10px的空行,什么也没有。

  原因是全部采用utf8编码,包含文档的时候,最后的二进制流中包含了多次UTF8 BOM标记,IE不能正常解析包含多个UTF8 BOM 标记的页面,直接替换成实际显示的回车,这样导致一个空行,而firefox却没有这个问题。

  故如果模板采用包含的method包含多个utf8文档需要用ultraedit保存时另存为功能 选择utf8 无bom格式保存即可。

  另外,如果中文页面在html head标记中将title标记放在前面会导致页面空白。

  所以utf8页面应该使用标准顺序
代码如下:











BOM头:\xEF\xBB\xBF,PHP脚本4、5尚对BOM无视,所以在解析前直接输出。

对此 w3.org 标准 FAQ 中对此问题有一个专门的描述:

www.w3.org/International/questions/qa-utf8-bom

具体如下:

在UCS 编码中有一个叫做”ZERO WIDTH NO-BREAK SPACE”的char,它的编码是FEFF。而FFFE在UCS中是不存在的char,所以不应该出现在实际传输中。UCS规范建议我们在传输字节流前,先传输 char”ZERO WIDTH NO-BREAK SPACE”。这样如果接收者收到FEFF,就表明这个字节流是Big-Endian的;如果收到FFFE,就表明这个字节流是Little- Endian的。因此char”ZERO WIDTH NO-BREAK SPACE”又被称作BOM。

UTF-8不需要BOM来表明字节顺序,但可以用BOM来表明编码方式。char”ZERO WIDTH NO-BREAK SPACE”的UTF-8编码是EF BB BF。所以如果接收者收到以EF BB BF开头的字节流,就知道这是UTF-8编码了。

Windows就是使用BOM来标记文本文档的编码方式的操作Systam: Professional , 缺省char集:中文

1) notepad : 可以自动识别出没有带 bom 的 utf-8 编码格式文档,但不可以控制保存文档时是否添加 bom , 如果保存文档,那么会统一添加 bom 。

2)editplus : 不能自动识别出没有 bom 的 utf-8 编码格式文档,文档保存时,选择UTF-8 格式,不会在文档头写上 BOM header.

3) UltraEdit : 对于char编码的功能最为强大, 可以自动识别带 bom 和不带 bom 的 utf-8 文档 (可以配置) ; 保存的时候可以通过配置选择是否添加 bom.
(特别需要注意的是,保存一个新建立的文档时,需要选择另存为 utf-8 no bom 格式)

后来发现 Notepad ++ 也对于 utf-8 bom 支持比较好,推荐大家使用。
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