腾讯PHP工程师笔试题和面试题答案(二)

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  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 rePsentation 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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