1. Use PHP to print out the time of the previous day in the format of 2006-5-10 22:21:21

## $yesterday = mktime(0, 0 , 0, date("m") , date("d")-1 , date("Y"));

echo date("Y-M-d h:i:s" , $yesterday);

Note: mktime returns unix timestamp.

int mktime ([ int $hour [, int $minute [, int $second [, int $month [, int $day [, int $year [, int $is_dst ]]]]]]]

You can understand it by looking at the function definition on php.net:

#print — Output a string

echo — Output one or more strings
#          

— Dumps information about a variable##            

print_r — Prints human-readable information about a variable In addition:

                                                                              printf

Output a formatted string                                                                          

—   Return a formatted string

flush —   Flush the output buffer 3, the template that can separate HTML and PHP

# ste MARTY (very good template engine), PHPLIB , Fasttemplete,

php4 comes with (IntegratedTemplate, IntegratedTemplateExtension)

Another:

# 1. You can implement one yourself. Commonly used HTML tags such as select, input, etc. are convenient for program and database processing. Then use the program to call the static page containing the template tag. However, smarty is based on the caching mechanism. There is a templates_c directory to generate temporary files for storage. This aspect is relatively advanced. If you write it yourself, it will be more complicated.

2.Separating logic and performance is the right way, rather than simply separating HTML and PHP

3. Pay attention to the difference between template engines and frameworks, and consider it from the perspective of MVC.

## 4. What tools are used for version control?

svn,cvs, VSS(ms)## 5. How to achieve string flipping?

Strrev ()

## This If you consider sufficient (Chinese character problem), I find the following code:

#

1.function reverse($str)
{
     $len=strlen($str);
     $newstr = '';
     for($i=$len;$i>=0;$i--)
     {
         $newstr .= $str{$i};
     }
     return $newstr;
}

    2. join("",array_reverse(str_split($str,1))),str_split($str,1)函数按长度分割字符串。explode()按分割符分割字符串.

    3.function rev_str($str)
   {
    $len = strlen($str);
    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(array_reverse($new_str));
}

Mainly from several perspectives: Optimizing hardware, optimizing disk, optimizing operating system, selecting application programming interface, etc.

Use index etc. 　

#　　8、MYSQL取得当前时间的函数是?格式化日期的函数是

mysql: now() ; date_format();

              php:      time();   date();

　　9、实现中文字串截取无乱码的方法。

其核心是处理中文问题，见blog:http://www.cnblogs.com/nbkhic/archive/2011/07/16/2108335.html

很多处理都是这些思路，如何判断汉字边界的问题，防止出现汉字截断。

              $_SERVER["SERVER_ADDR"]         这个是服务器ip
              $_SERVER["REMOTE_ADDR"]        这个是客户端ip

              _SERVER显示服务器和执行环境信息。http://php.net/manual/en/reserved.variables.server.php

include如果包含出错，报错继续执行。

requre如果出错，终止执行脚本。

requre_once() ; 包含一次

更深入一步理解：http://blog.csdn.net/followingturing/article/details/8102789

通常是修改php.ini中某个配置项值，可google之。

file_get_contents();

fopen()都可以。

复杂的话，用curl。

401：需要用户验证。 get_headers();

其它常用：200,301,302,404等等。 详见：http://baike.baidu.com/view/1790469.htm

非常好的一项技术，用好了很方便，本质一句话：字符串输出技术。

http://blog.csdn.net/followingturing/article/details/8102862

18. Write the SQL of the names of the ten people with the most posts, using the following table: members(id,username,posts,pass,email)

select top 10 username from members order by posts desc.

　20. What is the function of error_reporting in PHP?

            php.net says: “Sets which PHP errors are reported