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比較基礎(chǔ)的php面試題及答案-填空題
填空題:
1.在PHP中，當(dāng)前腳本的名稱(不包括路徑和查詢字符串)記錄在預(yù)定義變量__$_SERVER['PHP_SELF']__中;而鏈接到當(dāng)前頁(yè)面的URL記錄在預(yù)定義變量__$_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(yǔ)句為_(kāi)___。
4.數(shù)組函數(shù) arsort 的作用是__對(duì)數(shù)組進(jìn)行逆向排序并保持索引關(guān)系__;語(yǔ)句 error_reporting(2047)的作用是__報(bào)告所有錯(cuò)誤和警告__。
5.PEAR中的數(shù)據(jù)庫(kù)連接字符串格式是____。
6.寫(xiě)出一個(gè)正則表達(dá)式，過(guò)慮網(wǎng)頁(yè)上的所有JS/VBS腳本(即把scrīpt標(biāo)記及其內(nèi)容都去掉):preg_replace(“//si”, “newinfo”, $script);
7.以Apache模塊的方式安裝PHP，在文件http.conf中首先要用語(yǔ)句____動(dòng)態(tài)裝載PHP模塊，然后再用語(yǔ)句____使得Apache把所有擴(kuò)展名為php的文件都作為PHP腳本處理。
LoadModule php5_module “c:/php/php5apache2.dll” , AddType application/x-httpd-php .php,
8.語(yǔ)句 include 和 require 都能把另外一個(gè)文件包含到當(dāng)前文件中，它們的區(qū)別是____;為了避免多次包含同一文件，可以用語(yǔ)句__require_once||include_once__來(lái)代替它們。
9.類的屬性可以序列化后保存到 session 中，從而以后可以恢復(fù)整個(gè)類，這要用到的函數(shù)是____。
10.一個(gè)函數(shù)的參數(shù)不能是對(duì)變量的引用，除非在php.ini中把__allow_call_time_pass_reference boolean__設(shè)為on.
11.SQL中LEFT JOIN的含義是__自然左外鏈接__。如果 tbl_user記錄了學(xué)生的姓名(name)和學(xué)號(hào)(ID)，tbl_score記錄了學(xué)生(有的學(xué)生考試以后被開(kāi)除了，沒(méi)有其記錄)的學(xué)號(hào)(ID)
和考試成績(jī)(score)以及考試科目(subject)，要想打印出各個(gè)學(xué)生姓名及對(duì)應(yīng)的的各科總成績(jī)，則可以用SQL語(yǔ)句____。
12.在PHP中，heredoc是一種特殊的字符串，它的結(jié)束標(biāo)志必須____。
編程題:
13.寫(xiě)一個(gè)函數(shù)，能夠遍歷一個(gè)文件夾下的所有文件和子文件夾。
答:
function my_scandir($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 $files;
}
}
14.簡(jiǎn)述論壇中無(wú)限分類的實(shí)現(xiàn)原理。
答:
/*
數(shù)據(jù)表結(jié)構(gòu)如下:
CREATE TABLE `category` (
`categoryID` smallint(5) unsigned NOT NULL auto_increment,
`categoryParentID` smallint(5) unsigned NOT NULL default ’0′,
`categoryName` varchar(50) NOT NULL default ”,
PRIMARY KEY (`categoryID`)
) ENGINE=MyISAM DEFAULT CHARSET=gbk;
INSERT INTO `category` ( `categoryParentID`, `categoryName`) VALUES
(0, ‘一級(jí)類別’),
(1, ‘二級(jí)類別’),
(1, ‘二級(jí)類別’),
(1, ‘二級(jí)類別’),
(2, ‘三級(jí)類別’),
(2, ’333332′),
(2, ’234234′),
(3, ‘aqqqqqd’),
(4, ‘哈哈’),
(5, ’66333666′);
*/
//指定分類id變量$category_id,然后返回該分類的所有子類
//$default_category為默認(rèn)的選中的分類
function Get_Category($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[$category_id]);
}
/*
函數(shù)返回的數(shù)組格式如下所示:
Array
(
[1] => Array ( [id] => 1 [name] => 一級(jí)類別 [level] => 0 [ParentID] => 0 )
[4] => Array ( [id] => 4 [name] => 二級(jí)類別 [level] => 1 [ParentID] => 1 )
[9] => Array ( [id] => 9 [name] => 哈哈 [level] => 2 [ParentID] => 4 )
[3] => Array ( [id] => 3 [name] => 二級(jí)類別 [level] => 1 [ParentID] => 1 )
[8] => Array ( [id] => 8 [name] => aqqqqqd [level] => 2 [ParentID] => 3 )
[2] => Array ( [id] => 2 [name] => 二級(jí)類別 [level] => 1 [ParentID] => 1 )
[7] => Array ( [id] => 7 [name] => 234234 [level] => 2 [ParentID] => 2 )
[6] => Array ( [id] => 6 [name] => 333332 [level] => 2 [ParentID] => 2 )
[5] => Array ( [id] => 5 [name] => 三級(jí)類別 [level] => 2 [ParentID] => 2 )
[10] => Array ( [id] => 10 [name] => 66333666 [level] => 3 [ParentID] => 5 )
)
*/
//指定分類id,然后返回?cái)?shù)組
function Category_array($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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