PHP工程师笔试题汇总

PHP工程师笔试题汇总

腾讯PHP工程师笔试题

1．请对POSIX风格和兼容Perl风格两种正则表达式的主要函数进行类比说明

ereg preg_match

ereg_replace preg_replace

2．请说明在php.ini中safe_mode开启之后对于PHP系统函数的影响

3． PHP5中魔术方法函数有哪几个，请举例说明各自的用法

__sleep

__wakeup

__toString

__set_state

__construct,

__destruct

__call,

__get,

__set,

__isset,

__unset

__sleep,

__wakeup,

__toString,

__set_state,

__clone

__autoload

4．请写出让，并说明如何在命令行下运行PHP脚本（写出两种方式）同时向PHP脚本传递参数？

5． PHP的垃圾收集机制是怎样的

6．使对象可以像数组一样进行foreach循环，要求属性必须是私有。

(Iterator模式的PHP5实现，写一类实现Iterator接口)

7．请写一段PHP代码，确保多个进程同时写入同一个文件成功

8．用PHP实现一个双向队列

9．使用正则表达式提取一段标识语言（html或xml）代码段中指定标签的指定属性值（需考虑属性值对不规则的情况，如大小写不敏感，属性名值与等号间有空格等）。此处假设需提取test标签的attr属性值，请自行构建包含该标签的串

10．请使用socket相关函数（非curl）实现如下功能：构造一个post请求，发送到指定http server的指定端口的指定请求路径（如https://www.360docs.net/doc/a29578749.html,:8080/test）。请求中包含以下变量：

用户名（username）：温柔一刀

密码（pwd）：&123=321&321=123&

个人简介（intro）：Hello world!

且该http server需要以下cookie来进行简单的用户动作跟踪：

cur_query：you&me

last_tm：...（上次请求的unix时间戳，定为当前请求时间前10分钟）

cur_tm：...（当前请求的unix时间戳）

设置超时为10秒，发出请求后，将http server的响应内容输出。

1.

Function encode($data, $sep = ‘&’){

2.

while (list($k,$v) = each($data)) {

3.

$encoded .= ($encoded ? "$sep" : "");

4.

$encoded .= rawurlencode($k)."=".rawurlencode($v);

5.

}

6.

Return $encoded;

7.

}

8.

9.

Function post($url, $post, $cookie){

10.

$url = parse_url($url);

11.

$post = encode($data, ‘&’);

12.

$cookie = encode($cookieArray, ‘;’);

13.

$fp = fsockopen($url['host'], $url['port'] ? $url['port'] : 80, $errno, $errstr, 10);

14.

if (!$fp) return "Failed to open socket to $url[host]";

15.

16.

fputs($fp, sprintf("POST %s%s%s HTTP/1.0\n", $url['path'], $url['query'] ? "?" : "", $url['query']));

17.

fputs($fp, "Host: $url[host]\n");

18.

fputs($fp, "Content-type: application/x-www-form-urlencoded\n");

fputs($fp, "Content-length: " . strlen($encoded) . "\n");

20.

fputs($fp, "Cookie: $cookie\n\n");

21.

fputs($fp, "Connection: close\n\n");

22.

fputs($fp, "$post \n");

23.

24.

while (!feof($fp)) {

25.

echo fgets($fp, 128);

26.

}

27.

fclose($fp);

28.

}

29.

30.

$url = ‘https://www.360docs.net/doc/a29578749.html,:8080/test’;

31.

$encoded = username=温柔一刀& pwd=

32.

$post = array(

33.

‘username’=> ‘温柔一刀’,

34.

‘pwd => ‘&123=321&321=123&’,

35.

‘intro => ‘Hello world!’

36.

);

$cookie = array(

38.

‘cur_query’ => ‘you&me,

39.

‘last_tm’ => time() - 600,

40.

‘cur_tm ‘=> time()

41.

);

42.

43.

Post($url, $post, $cookie);

复制代码

11．你用什么方法检查PHP脚本的执行效率（通常是脚本执行时间）和数据库SQL的效率（通常是数据库Query时间），并定位和分析脚本执行和数据库查询的瓶颈所在？

1．脚本执行时间，启用xdebug，使用WinCacheGrind分析。

2．数据库查询，mysql使用EXPLAIN分析查询，启用slow query log记录慢查询。

PHP LAMP Engineer Test Paper

Question 1

What does print out?

A) 3

B) False

C) Null

D) 1

E) 0

Question 2

Which of the following snippets prints a representation of 42 with two decimal places?

A) printf("%.2d\n", 42);

B) printf("%1.2f\n", 42);

C) printf("%1.2u\n", 42);

Question 3

Given

$text = 'Content-Type: text/xml';

Which of the following prints 'text/xml'?

A) print substr($text, strchr($text, ':'));

B) print substr($text, strchr($text, ':') + 1);

C) print substr($text, strpos($text, ':') + 1);

D) print substr($text, strpos($text, ':') + 2);

E) print substr($text, 0, strchr($text, ':')

Question 4

What is the value of $a?

$a = in_array('01', array('1')) == var_dump('01' == 1); ?>

A) True

B) False

Question 5

What is the value of $result in the following PHP code?

function timesTwo($int) {

$int = $int * 2;

}

$int = 2;

$result = timesTwo($int);

?>;

Answer: NULL

Question 6

The code below ___________ because ____________.

class Foo {

?>

function bar() {

print "bar";

}

}

?>

A) will work, class definitions can be split up into multiple PHP blocks.

B) will not work, class definitions must be in a single PHP block.

C) will not work, class definitions must be in a single file but can be in multiple PHP blocks.

D) will work, class definitions can be split up into multiple files and multiple PHP blocks.

Question 7

When turned on, ____________ will _________ your script with different variables from HTML forms and cookies.

A) show_errors, enable

B) show_errors, show

C) register_globals, enhance

D) register_globals, inject

Question 8

What will be the output of the following PHP code:

echo count(strlen("https://www.360docs.net/doc/a29578749.html,"));

?>

Answer: 1

Question 9

What is the best all-purpose way of comparing two strings?

A) Using the strpos function

B) Using the == operator

C) Using strcasecmp()

D) Using strcmp()

Question 10

What is the difference between "print()" and "echo()"?

Answer: print is a function,echo is a language construct