


Interview question 1
1. Use PHP to print out the time of the previous day in the format of 2006-5-10 22:21:21
2. The difference between echo(), print() and print_r()
3. A template that enables HTML and PHP to be used separately
4. How to realize PHP and JSP interaction?
5. What tools are used for version control?
6. How to implement string flipping?
7. Methods to optimize MYSQL database.
8. Talk about transaction processing
9. The method of apache+mysql+php to achieve maximum load
10. The method of intercepting Chinese text strings without garbled characters.
Answer:
1.echo date('Y-m-d H:i:s', strtotime('-1 day'));
2.echo is a language structure , no return value; the print function is basically the same as echo, the difference is that print is a function with a return value; print_r is recursive printing, used to output array objects
3.so much, in fact, PHP itself is a Template engine, I have used smarty, common ones include PHPLib, FastTemplate, Savant. Here is a list of template engines: http://www.sitepoint.com/forums/showthread.php?t=123769
4. The question is a bit vague. SOAP, XML_RPC, Socket function, and CURL can all achieve these. If you are testing the integration of PHP and Java, PHP has this built-in mechanism (if you are testing the integration of PHP and .NET, you can also do this) Answer), for example $foo = new Java('java.lang.System');
5. CVS and SVN, SVN is known as the next generation of CVS and has powerful functions, but CVS is an old brand and has a high market share .I have been using SVN. The question is about what tool to use. Well, this may need to be answered like this: CVS Server on Apache as the server, WinCVS as the client; Subversion on Apache/DAV as the server, TortoiseSVN as the client, or Subclipse Make a client.
6. Use the strrev function. If you are not allowed to use PHP’s built-in one, just write it yourself:
function strrev($str)
{
$len=strlen($str );
$newstr = '';
for($i=$len;$i>=0;$i--)
{
$newstr .= $str{$i} ;
}
return $newstr;
}
7. For college entrance examination political questions, write down all the knowledge points you know. My answer:
(1). In terms of database design, this is the responsibility of the DBA and Architect. Design a well-structured database. When necessary, denormalize (this is in English: denormalize, I don’t know the Chinese translation), allow partial data redundancy, and avoid JOIN operations. , to improve query efficiency
(2). In terms of system architecture design, table hashing is used to hash massive data into several different tables. Fast and slow tables, fast tables only retain the latest data, and slow tables are historical archives. Cluster, master server Read & write, slave server read only, or N servers, each machine is Master for each other
(3). (1) and (2) exceed the requirements of PHP Programmer, it will be better, not It doesn’t matter. Check whether there are fewer indexes
(4). Write efficient SQL statements and see if there are any inefficient SQL statements, such as full joins that generate Cartesian products, a large number of Group By and order by, There is no limit, etc. When necessary, encapsulate the database logic into the stored procedure on the DBMS side. Cache the query results and explain each SQL statement
(5). All the results are required, and only the necessary data is obtained from the database, such as query The number of comments on an article, select count(*) ... where article_id = ? Just do not select * ... where article_id = ? and then msql_num_rows.
Only transmit necessary SQL statements, such as modifying articles , if the user only modified the title, then update... set title = ? where article_id = ? Do not set content = ? (large text)
(6). Use a different storage engine when necessary. For example InnoDB can reduce deadlocks. HEAP can increase the query speed by an order of magnitude.
8. Just like every programming language will have examples that allow Hello World, the textbooks on this database will all talk about the account transfer from A to B 50 For the dollar example, just answer this. But as far as I know, companies that use MySQL rarely use MySQL to implement transaction processing. What’s more, Oracle has acquired the InnoDB company.
9. See seventh The answer to the question will be solved if that place is solved.
10. Hahaha, I guess the person who asked the question has been troubled by the Chinese processing problem of substr for a long time, and has also used the Internet There is a popular function that uses regular expressions to match Chinese characters and then intercept them. In fact, there is a very simple solution: mb_substr()
Interview Question 2
var $empty = '';
var $null = NULL;
var $bool = FALSE;
var $notSet;
var $array = array();
1.
$a = "hello";
$b = &$a;
unset($b);
$b = "world";
what is $a?
2.
$a = 1;
$x = &$a;
$b = $a++;
what is $b?
3.
$x = empty($array);
what is $x? true or false
4. Have you ever used version control software? If so, what is the name of the version control software you use?
5. Have you used Through a template engine? If so, what is the name of the template engine you use?
6. Please briefly describe your most proud development work.
7. For websites with large traffic, what do you use? What method to solve the traffic problem?
8. Use PHP to write the code to display the client IP and server IP:
The answer will be written once the blog is updated.

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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