腾讯PHP工程师笔试题和面试题答案(二)

　　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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