PHP的base64_decode及写入mysql前的转义-php教程-PHP中文網

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PHP的base64_decode及写入mysql前的转义

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Jun 23, 2016 pm 01:54 PM

mysql php 寫入轉義

我看到这个函数解码后返回一个string。
现在我编码前是一个二进制文件流，从图像文件读取来的。如果用这个函数解码并赋值给一个变量，那么应该默认就是一个string变量了。string变量可以存储二进制文件流吗？如果不能，应该怎么做，才能正确解码呢？

另外一个问题是，解码后要将这个二进制流存入到mysql的一个longblob字段里面，我需要对哪些字符进行转义？PHP是不是有专门的函数来一次性实现这个转义的？

补充一下我所用的编码和解码方式：

编码部分（VC端）

char buffer[102400];  //BUF_SIZE大小自己定义DWORD length;//照片图片FILE * pFile = fopen("photo.bmp", "rb");int img = fread(buffer, sizeof(char), 102400, pFile);//将文件二进制流读入到buffer中fclose(pFile);CryptBinaryToString((const BYTE *)buffer,img,CRYPT_STRING_BASE64,NULL,&length);//获取存放编码后字串所需长度ImgString = new TCHAR[length];//ImgString是要发送给PHP的字串，根据上面获取的长度，初始化该字串length--;//减去最后字串结束符的位置CryptBinaryToString((const BYTE *)buffer,img,CRYPT_STRING_BASE64,ImgString,&length);//向ImgString里面存放buffer的base64编码

登入後複製

解码并写入数据库部分（PHP+Mysql)

$face = addslashes(base64_decode(trim($_REQUEST['face'],"'")));$query = "update index_base set face=$face where id=$bid";$result = mysql_query($query);

登入後複製

回复讨论(解决方案)

印象中二进制文件和字符串没什么不同啊..

转义用addslashes或者mysql_real_escape_string

我得到的出错提示：
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '\0\0\0\0\0\06\0\0\0(\0\0\0f\0\0\0~\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0' at line 1

印象中二进制文件和字符串没什么不同啊..

转义用addslashes或者mysql_real_escape_string

。。。二进制里面很多字串结束符的啊

那个出错提示里的错误位置，比mysql请求语句里面尝试写入的二进制流要短得多啊，不是已经转义过了吗，怎么还会截断？

请求里面是这个：
face=BMΗ\0\0\0\0\0\06\0\0\0(\0\0\0f\0\0\0~\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0 RZp?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????{??!0 \0\0 RZp??????????????w\\?|???\'?+??????????????????.?[?.+?{???z?z???????np?.0w|?????????????290ryp????|L?\\?|}??.??N???? 1?\00Q\0?q???1! ?`?pP?`@?P0?@ ?P1\0PA pa`??`??`??`??`??`??\0\0?P`?PP?PP?@@?0@? 0? 0? ? ? ? 0?0A\0@Q`Q pa0?qP??`??p??`??`??`??q\0?Q\0?a?……………………后面还有好长

行进中的是流，静止下来就是字符串
二进制文件和文本文件的区别在与前者没有文件结束符 ox1a
既然你发送的是 base64 编码所谓数据，那么入库时不需要解码，并且也不需要转义
待日后还原数据时再解码不迟

即使不解码、不转义，也是错的。

Invalid query: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''Qk3OlwAAAAAAADYAAAAoAAAAZgAAAH4AAAABABgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEAcID' at line 1Whole query: update index_base set cardtype=1, name='杨妍', sex='0', nationality='汉', birth='19850906', address='南京市鼓楼区广州路213-1号',expiration='20210602', expirebegin='20110602', cardid='321283198509060027',issued='南京市公安局鼓楼分局',SAMID= '05.03-20131218-0001645552-2769328138',IINSNDN='0000000000000000',face='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 2wt62wd 1wN63wN66w G9xuTAyefDy vEzOzFze/GzvDI0PLFze/Cyuy xui7w W6wuK5weG3v9 2vt63wN65wuC6w G7xOK6w G5wuC4wd 3wN64wd 5wuC6w G7xOK7xeG8xuK9x PAyOTByeXCyubDy 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…………
中间省略大段字符串
…………
7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v4AAP7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /v7 /gAA妄?????? where id=55556

不解码直接写入成功了。单引号改成双引号就可以了。
然后我试了下用同样的方法写入解码之后的值，也比以前好一点，至少这个长串数据前面有一段能正确识别，mysql报错的位置从数据串中间开始的。

不知道我解码再转义后是否能正确？

base64_encode后的就是字符串了，直接用base64_encode后的入?，出的?候再用base64_decde ??一次就可以了。

尾部的 .../v7 /v7 /gAA妄?????? 哪里来的？
这些是图片数据？显然是未经base64 编码的，因为 base64 编码中只有数字、大小写字母和 /-= 3个符号

我把二进制写进去了……但是图片完全损坏了。
在NaviCat里面可以看到图片的样子，身份证头像脖子领口以上完全歪到图片外面去了，没歪出去的部分也是很多彩色噪点，基本分辨不出来是什么。
如果把二进制字段另存为一个文件，那就根本打不开。

尾部的 .../v7 /v7 /gAA妄?????? 哪里来的？
这些是图片数据？显然是未经base64 编码的，因为 base64 编码中只有数字、大小写字母和 /-= 3个符号

我在VC端调试看了发送前的编码串，就是那个样子，看来是我编码不对了啊？

base64 编码只不过是将 3 个字节扩展成 4 个字节，是的每个字节的有效二进制位为 6 位，即十进制 0 ~ 63 供 64 种状态，故名 base64
我不是很清楚你做编码是使用库函数，还是自己写的代码
但从生成的串上看，肯定是弄错了

我用了wincrypt.h和crypt32.lib。而且两个是在不同地方下载的。会不会版本不一样哦。明天去公司看看。

在网上找个Base64编码的C源代码试试吧，很多啊。而且有很多在线编码的网页可以用来验证编码和解码是否正确：http://www1.tc711.com/tool/BASE64.htm

是在C语言里编码的时候，长度少了一位，把字符串结束符给截掉了。
改成JpgBack = new TCHAR[length+1];，后面的lentth--删掉，就没有乱码了。

但是还有个问题怎么解决啊，我得到的字串每64个字符就有一个换行。怎么把换行截掉？

对应该是需要的长度 + 1个结束位
每64个字符就有一个换行？是一个回车一个换行吧？
这是正常的传输格式（RFC 2045），目的是能快速校正传输中的漏码
到解码时删掉就行了

我现在已经找到办法删掉回车和换行了。
但是，但是又出问题了。。。

传输过去之前的编码是正常的，我能用网上找到的编解码器恢复成图像。
而且我是特地断点检查了发送前的postdata字串里面的，都是对的。
但是一旦传递到PHP这边，我用$face = $_REQUEST['face'];接收传参，立刻die ($face)，结果出来的字串，所有的加号（+）全部被替换成了空格。

这是怎么回事啊

我知道这些都能在日后读取的时候处理，但是我们老板不懂技术，我最好是从mysql里面复制出来直接能解码给他看。。。

+ 变成空格是 URL 解码的功劳
$face = str_replace(' ', '+', $_REQUEST['face']);
换回来就是了

$img = base64_decode($face);
还原回图片数据了

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