笔试题PHP工程师

时间:2022-10-26 20:04:03 笔试题目 我要投稿
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笔试题(PHP工程师)

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

笔试题(PHP工程师)

  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http://www.example.com: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。复制内容到剪贴板代码:Function encode($data, $sep = ‘&’){

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

  $encoded .= ($encoded ? “$sep” : “”);

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

  }

  Return $encoded;

  }

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

  $url = parse_url($url);

  $post = encode($data, ‘&’);

  $cookie = encode($cookieArray, ‘;’);

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

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

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

  fputs($fp, “Host: $url[host]\n”);

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

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

  fputs($fp, “Cookie: $cookie\n\n”);

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

  fputs($fp, “$post \n”);

  while (!feof($fp)) {

  echo fgets($fp, 128);

  }

  fclose($fp);

  }

  $url = ‘http://www.example.com:8080/test’;

  $encoded = username=温柔一刀& pwd=

  $post = array(

  ‘username’=> ‘温柔一刀’,

  ‘pwd => ‘&123=321&321=123&’,

  ‘intro => ‘Hello world!’

  );

  $cookie = array(

  ‘cur_query’ => ‘you&me,

  ‘last_tm’ => time() – 600,

  ‘cur_tm ‘=> time()

  );

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

  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(“http://php.net”));

  ?>

  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
 

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