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公司面試題之:騰訊PHP工程師筆試題
1. 請對pOSIX風(fēng)格和兼容perl風(fēng)格兩種正則表達式的主要函數進(jìn)行類(lèi)比說(shuō)明
ereg preg_match
ereg_replace preg_replace
2. 請說(shuō)明在php.ini中safe_mode開(kāi)啟之后對于pHp系統函數的影響
3. pHp5中魔術(shù)方法函數有哪幾個(gè),請舉例說(shuō)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(xiě)出讓?zhuān)⒄f(shuō)明如何在命令行下運行pHp腳本(寫(xiě)出兩種方式)同時(shí)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(jìn)行foreach循環(huán),要求屬性必須是私有。
(Iterator模式的pHp5實(shí)現,寫(xiě)一類(lèi)實(shí)現Iterator接口)
7.請寫(xiě)一段pHp代碼,確保多個(gè)進(jìn)程同時(shí)寫(xiě)入同一個(gè)文件成功
8. 用pHp實(shí)現一個(gè)雙向隊列
9. 使用正則表達式提取一段標識語(yǔ)言(html或xml)代碼段中指定標簽的指定屬性值(需考慮屬性值對不規則的情況,如大小寫(xiě)不敏感,屬性名值與等號間有 空格等)。此處假設需提取test標簽的attr屬性值,請自行構建包含該標簽的串
10.請使用socket相關(guān)函數(非curl)實(shí)現如下功能:構造一個(gè)post請求,發(fā)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:
用戶(hù)名(username):溫柔一刀
密碼(pwd):&123=321&321=123&
個(gè)人簡(jiǎn)介(intro):Hello world!
且該http server需要以下cookie來(lái)進(jìn)行簡(jiǎn)單的用戶(hù)動(dòng)作跟蹤:
cur_query:you&me
last_tm:...(上次請求的unix時(shí)間戳,定為當前請求時(shí)間前10分鐘)
cur_tm:...(當前請求的unix時(shí)間戳)
設置超時(shí)為10秒,發(fā)出請求后,將http server的響應內容輸出。復制內容到剪貼板代碼: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=溫柔一刀& pwd=
$post = array(
‘username’=> ‘溫柔一刀’,
‘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.你用什么方法檢查pHp腳本的執行效率(通常是腳本執行時(shí)間)和數據庫SQL的效率(通常是數據庫Query時(shí)間),并定位和分析腳本執行和數據庫查詢(xún)的瓶頸所在?
1.腳本執行時(shí)間,啟用xdebug,使用WinCacheGrind分析。
2.數據庫查詢(xún),mysql使用EXpLAIN分析查詢(xún),啟用slow query log記錄慢查詢(xún)。
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
$text = Content-Type: text/xml;
Which of the following prints ext/xml?
A) print substr($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?
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