PHP写入数据库中文乱码问题

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声明：本篇文章来自http://www.jb51.net/article/30123.htm

PHP页面转UTF-8编码问题 

1.在代码开始出加入一行： 

header("Content-Type: text/html;charset=utf-8"); 

<span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">2.PHP文件编码问题 </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">点击编辑器的菜单：“文件”->“另存为”，可以看到当前文件的编码，确保文件编码为：UTF-8， </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">如果是ANSI，需要将编码改成：UTF-8。 </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">3.PHP文件头BOM问题： </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">PHP文件一定不可以有BOM标签 </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">否则，会出现session不能使用的情况，并有类似的提示： </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">这是因为，在执行session_start() 的时候，整个页面不能有输出，但是当由于前PHP页面存在BOM标签， </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">PHP把这个BOM标签当成是输出了，所以就出错了！ </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">所以PHP页面一定要删除BOM标签 </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">删除这个BOM标签的方法： </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">1.可以用Dreamweaver打开文件，并重新保存，即可以去除BOM标签！ </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">2.可以用EditPlus打开文件，并在菜单“首选项”->“文件”->"UTF-8标识"，设置为：“总是删除签名”， </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">然后保存文件，即可以去除BOM标签！ </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">4.PHP以附件形式保存文件的时候，UTF-8编码问题： </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">PHP以附件形式保存文件，文件名必须是GB2312编码， </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">否则，如果文件名中有中文的话，将是显示乱码： </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">如果你的PHP本身是UTF-8编码格式的文件， </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">需要将文件名变量由UTF-8转成GB2312： </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">iconv("UTF-8", "GB2312", "$filename"); </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">利用程序来实例字符截取方法 </span>

<span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"></span><pre name="code" class="php">function utf8_substr($str,$len) 
{ 
　　for($i=0;$i<$len;$i++) 
　　{ 
　　　　$temp_str=substr($str,0,1); 
　　　　if(ord($temp_str) > 127){ 
　　　　　　$i++; 
　　　　if($i<$len){ 
　　　　　　$new_str[]=substr($str,0,3); 
　　　　　　$str=substr($str,3); 
　　　　　　} 
　　　　}else { 
　　　　$new_str[]=substr($str,0,1); 
　　　　$str=substr($str,1); 
　　　　} 
　　} 
　　return join($new_str); 
} 

<span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"></span><pre name="code" class="php">CREATE DATABASE `dbname` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci; 

<span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">创建数据表的时候：如果是该字段是存放中文的话，则需要将“整理”设置为：“utf8_general_ci”， </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">如果该字段是存放英文或数字的话，默认就可以了。 </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">相应的SQL语句，例如： </span>

<span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"></span><pre name="code" class="sql">CREATE TABLE `test` ( 
`id` INT NOT NULL , 
`name` VARCHAR( 10 ) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL , 
PRIMARY KEY ( `id` ) 
) ENGINE = MYISAM ; 

<span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"></span><pre name="code" class="php">$connection = mysql_connect($host_name, $host_user, $host_pass); 

<span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"></span></span><pre name="code" class="php">mysql_query("set character set 'utf8'");//读库 
mysql_query("set names 'utf8'");//写库 
//其实读写都可以只加入
mysql_query("set names 'utf8'")

<span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"></span></span></span><pre name="code" class="php">$conn = mysql_connect("$host","$user","$password"); 
mysql_query("SET NAMES 'UTF8'"); 
mysql_select_db("$database",$conn); 

<span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px; background-color: rgb(221, 237, 251);"><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> </span></span></span></span>

<span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">这样不管输入数据库的中文，还是页面显示，就都正常了。 </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">在DW CS4版里，默认生成的也是utf8页面。 </span><br style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;" /><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">同样的，如果一开始写数据库连接文件时写成： </span></span></span></span><pre name="code" class="php">mysql_query("SET NAMES 'GBK'"); 

<span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"><span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;"></span></span></span><pre name="code" class="cpp"><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 

<span style="font-family: tahoma, arial, 宋体; font-size: 14px; line-height: 25.2px;">

</span>

PHP写入数据库中文乱码问题

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原文地址：http://blog.csdn.net/yuanhengzhw/article/details/51626462