php借助Xpdf读取PDF中的内容

2. [root@localhost ~]# mkdir -p /lcf/upan
3. [root@localhost ~]# mkdir -p /lcf/cdrom
4. [root@localhost ~]# mkdir -p /lcf/xpdf
5. [root@localhost ~]# cd /lcf/upan/
6. [root@localhost upan]# cp xpdf/* ../xpdf/ （下载的文件放入/lcf/xpdf目录）
7. [root@localhost upan]# cd ../xpdf/
8. [root@localhost xpdf]# tar -zxvf xpdfbin-linux-3.03.tar.gz
9. [root@localhost xpdf]# cd xpdfbin-linux-3.03
10. [root@localhost xpdfbin-linux-3.03]# cat INSTALL
11. [root@localhost xpdfbin-linux-3.03]# cd bin32/
12. [root@localhost bin32]# cp ./* /usr/local/bin/
13. [root@localhost bin32]# cd ../doc/
14. [root@localhost doc]# mkdir -p /usr/local/man/man1
15. [root@localhost doc]# mkdir -p /usr/local/man/man5
16. [root@localhost doc]# cp *.1 /usr/local/man/man1
17. [root@localhost doc]# cp *.5 /usr/local/man/man5

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如果不需要读取中文的话，到这里就可以结束了，如果需要，那我们继续往后

2. [root@localhost doc]# cp sample-xpdfrc /usr/local/etc/xpdfrc
3. [root@localhost xpdf]# cd /lcf/xpdf
4. [root@localhost xpdf]# tar -zxvf xpdf-chinese-simplified.tar.gz
5. [root@localhost xpdf]# cd xpdf-chinese-simplified
6. [root@localhost xpdf]# mkdir -p/usr/local/share/xpdf/chinese-simplified
7. [root@localhost xpdf]# cd xpdf-chinese-simplified/
8. [root@localhost xpdf-chinese-simplified]# cp Adobe-GB1.cidToUnicode ISO-2022-CN.unicodeMap EUC-CN.unicodeMap GBK.unicodeMap CMAP /usr/local/share/xpdf/chinese-simplified/

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把chinese-simplified里面文件add-to-xpdfrc 的内容复制到/usr/local/etc/xpdfrc文件中。记得里面的路径要正确。（注意，这里面的简体中文包包括以下三种格式：ISO-2022-CN，EUC-CN，GBK ，看清楚哦，不支持UTF-8，可以先转为GBK，然后进行转义）

三、功能实现
至此，所有的配置完毕，我们要开始使用它了。
如果是简单的PDF读取，那么直接用下面的语句就OK了。
$content = shell_exec(‘/usr/local/bin/pdftotext ‘.$filename.’ -‘);

如果需要转中文，如此这般，加上参数。
$content = shell_exec(‘/usr/local/bin/pdftotext -layout -enc GBK ‘.$filename.’ -‘);

当然，加了参数之后依然是不影响英文的转换的，所以，放心使用吧。需要注意的是，这里转出来的是GBK编码的哦，现在网站很多用的是UTF-8，想要不显示乱码的话，需要再次转义一下哦。
$content = mb_convert_encoding($content, ‘UTF-8′,’GBK’);
读取出来的内容，可以再写代码自行处理。

pdftotext的主要参数:
OPTIONS
Many of the following options can be set with configuration file com-
mands. These are listed in square brackets with the description of the
corresponding command line option.
-f number
Specifies the first page to convert.
-l number
Specifies the last page to convert.
-layout
Maintain (as best as possible) the original physical layout of
the text. The default is to ‘undo’ physical layout (columns,
hyphenation, etc.) and output the text in reading order.
-fixed number
Assume fixed-pitch (or tabular) text, with the specified charac-
ter width (in points). This forces physical layout mode.
-raw Keep the text in content stream order. This is a hack which
often “undoes” column formatting, etc. Use of raw mode is no
longer recommended.
-htmlmeta
Generate a simple HTML file, including the meta information.
This simply wraps the text in

 and 

登录后复制 and prepends the
meta headers.
-enc encoding-name