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比較基礎的php面試題及答案-填空題

時間:2023-04-05 10:34:44 筆試題目 我要投稿
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比較基礎的php面試題及答案-填空題

  填空題:

比較基礎的php面試題及答案-填空題

  1.在PHP中,當前腳本的名稱(不包括路徑和查詢字符串)記錄在預定義變量__$_SERVER['PHP_SELF']__中;而鏈接到當前頁面的URL記錄在預定義變量__$_SERVER['HTTP_REFERER']__

  中

  2.執(zhí)行程序段將輸出__0__。

  3.在HTTP 1.0中,狀態(tài)碼 401 的含義是____;如果返回“找不到文件”的提示,則可用 header 函數(shù),其語句為____。

  4.數(shù)組函數(shù) arsort 的作用是__對數(shù)組進行逆向排序并保持索引關系__;語句 error_reporting(2047)的作用是__報告所有錯誤和警告__。

  5.PEAR中的數(shù)據(jù)庫連接字符串格式是____。

  6.寫出一個正則表達式,過慮網(wǎng)頁上的所有JS/VBS腳本(即把scrīpt標記及其內(nèi)容都去掉):preg_replace(“//si”, “newinfo”, $script);

  7.以Apache模塊的方式安裝PHP,在文件http.conf中首先要用語句____動態(tài)裝載PHP模塊,然后再用語句____使得Apache把所有擴展名為php的文件都作為PHP腳本處理。

  LoadModule php5_module “c:/php/php5apache2.dll” , AddType application/x-httpd-php .php,

  8.語句 include 和 require 都能把另外一個文件包含到當前文件中,它們的區(qū)別是____;為了避免多次包含同一文件,可以用語句__require_once||include_once__來代替它們。

  9.類的屬性可以序列化后保存到 session 中,從而以后可以恢復整個類,這要用到的函數(shù)是____。

  10.一個函數(shù)的參數(shù)不能是對變量的引用,除非在php.ini中把__allow_call_time_pass_reference boolean__設為on.

  11.SQL中LEFT JOIN的含義是__自然左外鏈接__。如果 tbl_user記錄了學生的姓名(name)和學號(ID),tbl_score記錄了學生(有的學生考試以后被開除了,沒有其記錄)的學號(ID)

  和考試成績(score)以及考試科目(subject),要想打印出各個學生姓名及對應的的各科總成績,則可以用SQL語句____。

  12.在PHP中,heredoc是一種特殊的字符串,它的結束標志必須____。

  編程題:

  13.寫一個函數(shù),能夠遍歷一個文件夾下的所有文件和子文件夾。

  答:

  function my_scandir($dir)

  {

  $files = array();

  if ( $handle = opendir($dir) ) {

  while ( ($file = readdir($handle)) !== false ) {

  if ( $file != “..” && $file != “.” ) {

  if ( is_dir($dir . “/” . $file) ) {

  $files[$file] = scandir($dir . “/” . $file);

  }else {

  $files[] = $file;

  }

  }

  }

  closedir($handle);

  return $files;

  }

  }

  14.簡述論壇中無限分類的實現(xiàn)原理。

  答:

  /*

  數(shù)據(jù)表結構如下:

  CREATE TABLE `category` (

  `categoryID` smallint(5) unsigned NOT NULL auto_increment,

  `categoryParentID` smallint(5) unsigned NOT NULL default ’0′,

  `categoryName` varchar(50) NOT NULL default ”,

  PRIMARY KEY (`categoryID`)

  ) ENGINE=MyISAM DEFAULT CHARSET=gbk;

  INSERT INTO `category` ( `categoryParentID`, `categoryName`) VALUES

  (0, ‘一級類別’),

  (1, ‘二級類別’),

  (1, ‘二級類別’),

  (1, ‘二級類別’),

  (2, ‘三級類別’),

  (2, ’333332′),

  (2, ’234234′),

  (3, ‘aqqqqqd’),

  (4, ‘哈哈’),

  (5, ’66333666′);

  */

  //指定分類id變量$category_id,然后返回該分類的所有子類

  //$default_category為默認的選中的分類

  function Get_Category($category_id = 0,$level = 0, $default_category = 0)

  {

  global $DB;

  $sql = “SELECT * FROM category ORDER BY categoryID DESC”;

  $result = $DB->query( $sql );

  while ($rows = $DB->fetch_array($result))

  {

  $category_array[$rows[categoryParentID]][$rows[categoryID]] = array(‘id’ => $rows[categoryID], ‘parent’ => $rows[categoryParentID], ‘name’ => $rows

  [categoryName]);

  }

  if (!isset($category_array[$category_id]))

  {

  return “”;

  }

  foreach($category_array[$category_id] AS $key => $category)

  {

  if ($category['id'] == $default_category)

  {

  echo “\n”;

  }

  else

  {

  echo “>” . $category['name'] . “\n”;

  }

  Get_Category($key, $level + 1, $default_category);

  }

  unset($category_array[$category_id]);

  }

  /*

  函數(shù)返回的數(shù)組格式如下所示:

  Array

  (

  [1] => Array ( [id] => 1 [name] => 一級類別 [level] => 0 [ParentID] => 0 )

  [4] => Array ( [id] => 4 [name] => 二級類別 [level] => 1 [ParentID] => 1 )

  [9] => Array ( [id] => 9 [name] => 哈哈 [level] => 2 [ParentID] => 4 )

  [3] => Array ( [id] => 3 [name] => 二級類別 [level] => 1 [ParentID] => 1 )

  [8] => Array ( [id] => 8 [name] => aqqqqqd [level] => 2 [ParentID] => 3 )

  [2] => Array ( [id] => 2 [name] => 二級類別 [level] => 1 [ParentID] => 1 )

  [7] => Array ( [id] => 7 [name] => 234234 [level] => 2 [ParentID] => 2 )

  [6] => Array ( [id] => 6 [name] => 333332 [level] => 2 [ParentID] => 2 )

  [5] => Array ( [id] => 5 [name] => 三級類別 [level] => 2 [ParentID] => 2 )

  [10] => Array ( [id] => 10 [name] => 66333666 [level] => 3 [ParentID] => 5 )

  )

  */

  //指定分類id,然后返回數(shù)組

  function Category_array($category_id = 0,$level=0)

  {

  global $DB;

  $sql = “SELECT * FROM category ORDER BY categoryID DESC”;

  $result = $DB->query($sql);

  while ($rows = $DB->fetch_array($result))

  {

  $category_array[$rows['categoryParentID']][$rows['categoryID']] = $rows;

  }

  foreach ($category_array AS $key=>$val)

  {

  if ($key == $category_id)

  {

  foreach ($val AS $k=> $v)

  {

  $options[$k] =

  array(

  ‘id’ => $v['categoryID'], ‘name’ => $v['categoryName'], ‘level’ => $level, ‘ParentID’=>$v['categoryParentID']

  );

  $children = Category_array($k, $level+1);

  if (count($children) > 0)

  {

  $options = $options + $children;

  }

  }

  }

  }

  unset($category_array[$category_id]);

  return $options;

  }

  ?>

  class cate

  {

  function Get_Category($category_id = 0,$level = 0, $default_category = 0)

  {

  echo $category_id;

  $arr = array(

  ’0′ => array(

  ’1′ => array(‘id’ => 1, ‘parent’ => 0, ‘name’ => ’1111′),

  ’2′ => array(‘id’ => 2, ‘parent’ => 0, ‘name’ => ’2222′),

  ’4′ => array(‘id’ => 4, ‘parent’ => 0, ‘name’ => ’4444′)

  ),

  ’1′ => array(

  ’3′ => array(‘id’ => 3, ‘parent’ => 1, ‘name’ => ’333333′),

  ’5′ => array(‘id’ => 5, ‘parent’ => 1, ‘name’ => ’555555′)

  ),

  ’3′ => array(

  ’6′ => array(‘id’ => 6, ‘parent’ => 3, ‘name’ => ’66666′),

  ’7′ => array(‘id’ => 7, ‘parent’ => 3, ‘name’ => ’77777′)

  ),

  ’4′ => array(

  ’8′ => array(‘id’ => 8, ‘parent’ => 4, ‘name’ => ’8888′),

  ’9′ => array(‘id’ => 9, ‘parent’ => 4, ‘name’ => ’9999′)

  )

  );

  if (!isset($arr[$category_id]))

  {

  return “”;

  }

  foreach($arr[$category_id] AS $key => $cate)

  {

  if ($cate['id'] == $default_category)

  {

  $txt = “\n”;

  }else{

  $txt1 = “>” . $cate['name'] . “\n”;

  }

  $val = $txt.$txt1;

  echo $val;

  self::Get_Category($key, $level + 1, $default_category);

  }

  }

  function getFlush($category_id = 0,$level = 0, $default_category = 0)

  {

  ob_start();

  self::Get_Category($category_id ,$level, $default_category);

  $out = ob_get_contents();

  ob_end_clean();

  return $out;

  }

  }

  $id =$_GET['id'];

  echo “”;

  ?>

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