學問谷公司面試題之：騰訊PHP工程師筆試題
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1． 請對pOSIX風格和兼容perl風格兩種正則表達式的主要函數進行類比説明
ereg preg_match
ereg_replace preg_replace
2． 請説明在中safe_mode開啟之後對於pHp系統函數的影響
3． pHp5中魔術方法函數有哪幾個，請舉例説明各自的`用法
__sleep
__wakeup
__toString
__set_state
__construct,
__destruct
__call,
__get,
__set,
__isset,
__unset
__sleep,
__wakeup,
__toString,
__set_state,
__clone
__autoload
4． 請寫出讓，並説明如何在命令行下運行pHp腳本（寫出兩種方式）同時向pHp腳本傳遞參數？
5． pHp的垃圾收集機制是怎樣的
6．使對象可以像數組一樣進行foreach循環，要求屬性必須是私有。
(Iterator模式的pHp5實現，寫一類實現Iterator接口)
7．請寫一段pHp代碼，確保多個進程同時寫入同一個文件成功
8． 用pHp實現一個雙向隊列
9． 使用正則表達式提取一段標識語言（html或xml）代碼段中指定標籤的指定屬性值（需考慮屬性值對不規則的情況，如大小寫不敏感，屬性名值與等號間有 空格等）。此處假設需提取test標籤的attr屬性值，請自行構建包含該標籤的串
10．請使用socket相關函數（非curl）實現如下功能：構造一個post請求，發送到指定http server的指定端口的指定請求路徑。請求中包含以下變量：
用户名（username）：温柔一刀
密碼（pwd）：&123=321&321=123&
個人簡介（intro）：Hello world!
且該http server需要以下cookie來進行簡單的用户動作跟蹤：
cur_query：you&me
last_tm：...（上次請求的unix時間戳，定為當前請求時間前10分鐘）
cur_tm：...（當前請求的unix時間戳）
設置超時為10秒，發出請求後，將http server的響應內容輸出。複製內容到剪貼板代碼:Function encode($data, $sep = ‘&’){
while (list($k,$v) = each($data)) {
$encoded .= ($encoded ? "$sep" : "");
$encoded .= rawurlencode($k)."="rlencode($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/1.0n", $url[path], $url[query] ? "?" : "", $url[query]));
fputs($fp, "Host: $url[host]n");
fputs($fp, "Content-type: application/x-www-form-urlencodedn");
fputs($fp, "Content-length: " . strlen($encoded) . "n");
fputs($fp, "Cookie: $cookienn");
fputs($fp, "Connection: closenn");
fputs($fp, "$post n");
while (!feof($fp)) {
echo fgets($fp, 128);
}
fclose($fp);
}
$url = ‘’;
$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．你用什麼方法檢查pHp腳本的執行效率（通常是腳本執行時間）和數據庫SQL的效率（通常是數據庫Query時間），並定位和分析腳本執行和數據庫查詢的瓶頸所在？
1．腳本執行時間，啟用xdebug，使用WinCacheGrind分析。
2．數據庫查詢，mysql使用EXpLAIN分析查詢，啟用slow query log記錄慢查詢。
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("%.2dn", 42);
B) printf("%1.2fn", 42);
C) printf("%1.2un", 42);
Question 3
Given
$text = Content-Type: text/xml;
Which of the following prints ext/xml?
A) print substr($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?
<?php
$a = in_array(1, array(1)) == var_dump(1 == 1);
?>
A) True
B) False
Question 5
What is the value of $result in the following pHp code?
<?php
function timesTwo($int) {
$int = $int * 2;
}
$int = 2;
$result = timesTwo($int);
?>;
Answer: NULL
Question 6
The code below ___________ because ____________.
<?php
class Foo {
?>
<?php
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:
<?php
echo count(strlen(""));
?>
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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