Home Backend Development PHP Tutorial php5.4以上版本GBK编码下htmlspecialchars输出为空问题解决方法汇总_PHP

php5.4以上版本GBK编码下htmlspecialchars输出为空问题解决方法汇总_PHP

May 30, 2016 pm 02:59 PM
php5.4

从旧版升级到php5.4,恐怕最麻烦的就是htmlspecialchars这个问题了!当然,htmlentities也会受影响,不过,对于中文站来说一般用htmlspecialchars比较常见,htmlentities非常少用到。

可能老外认为网页普遍应该是utf-8编码的,于是苦了那些用GB2312,GBK编码的中文站......!

具体表现:

代码如下:


$str = "9enjoy.com的php版本是5.2.10";
echo htmlspecialchars($str);


gbk字符集下输出为空...utf-8下,输出正常。

为什么呢,原因在于5.4.0对这个函数的变化:

代码如下:


5.4.0   The default value for the encoding parameter was changed to UTF-8.


原来是什么呢?

代码如下:


string htmlspecialchars ( string $string [, int $flags = ENT_COMPAT | ENT_HTML401 [, string $encoding = 'UTF-8' [, bool $double_encode = true ]]] )

Defines encoding used in conversion. If omitted, the default value for this argument is ISO-8859-1 in versions of PHP prior to 5.4.0, and UTF-8 from PHP 5.4.0 onwards.


原来是ISO-8859-1,5.4后默认变成utf-8!然后中文使用这个函数就输出为空白了。

国内一堆开源程序在5.4下都会有这样的问题,DISCUZ官方也建议用户不要升级到5.4

解决方案:

1.苦逼的修改所有用到htmlspecialchars地方的程序

1.1 其第二个$flags参数,默认是ENT_COMPAT,因此改成

代码如下:


htmlspecialchars($str,ENT_COMPAT,'GB2312');


为什么不是GBK?因为没有GBK这个参数,如果强行使用GBK,则报错给你看:

代码如下:


Warning: htmlspecialchars(): charset `gbk' not supported, assuming utf-8


为了能使用GBK,则改成:

代码如下:


htmlspecialchars($str,ENT_COMPAT,'ISO-8859-1');


1.2.一样是改程序,但可以省略一个参数。
可以在网页头部加

代码如下:


ini_set('default_charset','gbk');


然后改成

代码如下:


htmlspecialchars($str,ENT_COMPAT,'');


文档中有写:An empty string activates detection from script encoding (Zend multibyte), default_charset and current locale (see nl_langinfo() and setlocale()), in this order. Not recommended.
大概意思就是:传入空字符串则使用default_charset的编码

1.3.封装一个函数吧...本来htmlspecialchars这个单词一直不好记。

代码如下:


function htmlout($str) {
    return htmlspecialchars($str,ENT_COMPAT,'ISO-8859-1');
}


然后去批量替换。

2.直接修改源码,重编译!这也是目前我在线上做的方案。
修改ext/standard/html.c
大概在372行

代码如下:


/* Default is now UTF-8 */
if (charset_hint == NULL)
return cs_utf_8;


把cs_utf_8改成 cs_8859_1

代码如下:


/* Default is now UTF-8 */
if (charset_hint == NULL)
return cs_8859_1;


编译后,原程序就不用做任何调整了。
安装方法可参考:http://www.bitsCN.com/article/63388.htm

windows下怎么办?这个,自己想办法编译吧,难度比较大...
提供一个网址供参考:http://www.bitsCN.com/article/63391.htm
引用其一句话:准备好咖啡、可乐,做好准备,可能要折腾数小时…

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