<p>比较基础的php面试题及答案 填空题部分 PHP面试题<br />
填空题:<br />
1.在PHP中，当前脚本的名称(不包括路径和查询字符串)记录在预定义变量__$_SERVER['PHP_SELF']__中;而链接到当前页面的URL记录在预定义变量__$_SERVER['HTTP_REFERER']__<br />
中<br />
2.执行程序段<!--?php echo 8%(-2) ?-->将输出__0__。<br />
3.在HTTP 1.0中，状态码 401 的含义是____;如果返回“找不到文件”的提示，则可用 header 函数，其语句为____。<br />
4.数组函数 arsort 的作用是__对数组进行逆向排序并保持索引关系__;语句 error_reporting(2047)的作用是__报告所有错误和警告__。<br />
5.PEAR中的数据库连接字符串格式是____。<br />
6.写出一个正则表达式，过虑网页上的所有JS/VBS脚本(即把scrīpt标记及其内容都去掉):preg_replace(”/<script[^>].*?>.*?</script>/si”, “newinfo”, $script);<br />
7.以Apache模块的方式安装PHP，在文件http.conf中首先要用语句____动态装载PHP模块，然后再用语句____使得Apache把所有扩展名为php的文件都作为PHP脚本处理。<br />
LoadModule php5_module “c:/php/php5apache2.dll” , AddType application/x-httpd-php .php,<br />
8.语句 include 和 require 都能把另外一个文件包含到当前文件中，它们的区别是____;为了避免多次包含同一文件，可以用语句__require_once||include_once__来代替它们。<br />
9.类的属性可以序列化后保存到 session 中，从而以后可以恢复整个类，这要用到的函数是____。<br />
10.一个函数的参数不能是对变量的引用，除非在php.ini中把__allow_call_time_pass_reference boolean__设为on.<br />
11.SQL中LEFT JOIN的含义是__自然左外链接__。如果 tbl_user记录了学生的姓名(name)和学号(ID)，tbl_score记录了学生(有的学生考试以后被开除了，没有其记录)的学号(ID)<br />
和考试成绩(score)以及考试科目(subject)，要想打印出各个学生姓名及对应的的各科总成绩，则可以用SQL语句____。<br />
12.在PHP中，heredoc是一种特殊的字符串，它的结束标志必须____。<br />
编程题:<br />
13.写一个函数，能够遍历一个文件夹下的所有文件和子文件夹。<br />
答:<br />
function my_scandir($dir)<br />
{<br />
$files = array();<br />
if ( $handle = opendir($dir) ) {<br />
while ( ($file = readdir($handle)) !== false ) {<br />
if ( $file != “..”&& $file != “.” ) {<br />
if ( is_dir($dir . “/” . $file) ) {<br />
$files[$file] = scandir($dir . “/” . $file);<br />
}else {<br />
$files[] = $file;<br />
}<br />
}<br />
}<br />
closedir($handle);<br />
return $files;<br />
}<br />
}<br />
14.简述论坛中无限分类的实现原理。<br />
答:<br />
<!--?php<br /-->
/*<br />
数据表结构如下:<br />
CREATE TABLE `category` (<br />
`categoryID` smallint(5) unsigned NOT NULL auto_increment,<br />
`categoryParentID` smallint(5) unsigned NOT NULL default ‘0′,<br />
`categoryName` varchar(50) NOT NULL default ”,<br />
PRIMARY KEY (`categoryID`)<br />
) ENGINE=MyISAM DEFAULT CHARSET=gbk;<br />
INSERT INTO `category` ( `categoryParentID`, `categoryName`) VALUES<br />
(0, ‘一级类别’),<br />
(1, ‘二级类别’),<br />
(1, ‘二级类别’),<br />
(1, ‘二级类别’),<br />
(2, ‘三级类别’),<br />
(2, ‘333332′),<br />
(2, ‘234234′),<br />
(3, ‘aqqqqqd’),<br />
(4, ‘哈哈’),<br />
(5, ‘66333666′);<br />
*/<br />
//指定分类id变量$category_id,然后返回该分类的所有子类<br />
//$default_category为默认的选中的分类<br />
function Get_Category($category_id = 0,$level = 0, $default_category = 0)<br />
{<br />
global $DB;<br />
$sql = “SELECT * FROM category ORDER BY categoryID DESC”;<br />
$result = $DB->query( $sql );<br />
while ($rows = $DB->fetch_array($result))<br />
{<br />
$category_array[$rows[categoryParentID]][$rows[categoryID]] = array(’id’ => $rows[categoryID], ‘parent’ => $rows[categoryParentID], ‘name’ => $rows<br />
[categoryName]);<br />
}<br />
if (!isset($category_array[$category_id]))<br />
{<br />
return “”;<br />
}<br />
foreach($category_array[$category_id] AS $key => $category)<br />
{<br />
if ($category['id'] == $default_category)<br />
{<br />
echo “
<option selected="" value="”.$category['id'].”";<br"></option>
}else<br />
{<br />
echo “
<option value="”.$category['id'].”";<br"></option>
}<br />
if ($level > 0)<br />
{<br />
echo “>” . str_repeat( ” “, $level ) . ” ” . $category['name'] . “n”;<br />
}<br />
else<br />
{<br />
echo “>” . $category['name'] . “n”;<br />
}<br />
Get_Category($key, $level + 1, $default_category);<br />
}<br />
unset($category_array[$category_id]);<br />
}<br />
/*<br />
函数返回的数组格式如下所示:<br />
Array<br />
(<br />
[1] => Array ( [id] => 1 [name] => 一级类别 [level] => 0 [ParentID] => 0 )<br />
[4] => Array ( [id] => 4 [name] => 二级类别 [level] => 1 [ParentID] => 1 )<br />
[9] => Array ( [id] => 9 [name] => 哈哈 [level] => 2 [ParentID] => 4 )<br />
[3] => Array ( [id] => 3 [name] => 二级类别 [level] => 1 [ParentID] => 1 )<br />
[8] => Array ( [id] => 8 [name] => aqqqqqd [level] => 2 [ParentID] => 3 )<br />
[2] => Array ( [id] => 2 [name] => 二级类别 [level] => 1 [ParentID] => 1 )<br />
[7] => Array ( [id] => 7 [name] => 234234 [level] => 2 [ParentID] => 2 )<br />
[6] => Array ( [id] => 6 [name] => 333332 [level] => 2 [ParentID] => 2 )<br />
[5] => Array ( [id] => 5 [name] => 三级类别 [level] => 2 [ParentID] => 2 )<br />
[10] => Array ( [id] => 10 [name] => 66333666 [level] => 3 [ParentID] => 5 )<br />
)<br />
*/<br />
//指定分类id,然后返回数组<br />
function Category_array($category_id = 0,$level=0)<br />
{<br />
global $DB;<br />
$sql = “SELECT * FROM category ORDER BY categoryID DESC”;<br />
$result = $DB->query($sql);<br />
while ($rows = $DB->fetch_array($result))<br />
{<br />
$category_array[$rows['categoryParentID']][$rows['categoryID']] = $rows;<br />
}<br />
foreach ($category_array AS $key=>$val)<br />
{<br />
if ($key == $category_id)<br />
{<br />
foreach ($val AS $k=> $v)<br />
{<br />
$options[$k] =<br />
array(<br />
‘id’ => $v['categoryID'], ‘name’ => $v['categoryName'], ‘level’ => $level, ‘ParentID’=>$v['categoryParentID']<br />
);<br />
$children = Category_array($k, $level+1);<br />
if (count($children) > 0)<br />
{<br />
$options = $options + $children;<br />
}<br />
}<br />
}<br />
}<br />
unset($category_array[$category_id]);<br />
return $options;<br />
}<br />
?><br />
<!--?php<br /-->
class cate<br />
{<br />
function Get_Category($category_id = 0,$level = 0, $default_category = 0)<br />
{<br />
echo $category_id;<br />
$arr = array(<br />
‘0′ => array(<br />
‘1′ => array(’id’ => 1, ‘parent’ => 0, ‘name’ => ‘1111′),<br />
‘2′ => array(’id’ => 2, ‘parent’ => 0, ‘name’ => ‘2222′),<br />
‘4′ => array(’id’ => 4, ‘parent’ => 0, ‘name’ => ‘4444′)<br />
),<br />
‘1′ => array(<br />
‘3′ => array(’id’ => 3, ‘parent’ => 1, ‘name’ => ‘333333′),<br />
‘5′ => array(’id’ => 5, ‘parent’ => 1, ‘name’ => ‘555555′)<br />
),<br />
‘3′ => array(<br />
‘6′ => array(’id’ => 6, ‘parent’ => 3, ‘name’ => ‘66666′),<br />
‘7′ => array(’id’ => 7, ‘parent’ => 3, ‘name’ => ‘77777′)<br />
),<br />
‘4′ => array(<br />
‘8′ => array(’id’ => 8, ‘parent’ => 4, ‘name’ => ‘8888′),<br />
‘9′ => array(’id’ => 9, ‘parent’ => 4, ‘name’ => ‘9999′)<br />
)<br />
);<br />
if (!isset($arr[$category_id]))<br />
{<br />
return “”;<br />
}<br />
foreach($arr[$category_id] AS $key => $cate)<br />
{<br />
if ($cate['id'] == $default_category)<br />
{<br />
$txt = “
<option selected="" value="”.$cate['id'].”";<br"></option>
}else{<br />
$txt = “
<option value="”.$cate['id'].”";<br"></option>
}<br />
if ($level > 0)<br />
{<br />
$txt1 = “>” . str_repeat( “-”, $level ) . ” ” . $cate['name'] . “n”;<br />
}else{<br />
$txt1 = “>” . $cate['name'] . “n”;<br />
}<br />
$val = $txt.$txt1;<br />
echo $val;<br />
self::Get_Category($key, $level + 1, $default_category);<br />
}<br />
}<br />
function getFlush($category_id = 0,$level = 0, $default_category = 0)<br />
{<br />
ob_start();<br />
self::Get_Category($category_id ,$level, $default_category);<br />
$out = ob_get_contents();<br />
ob_end_clean();<br />
return $out;<br />
}<br />
}<br />
$id =$_GET['id'];<br />
echo “<select>”; $c = new cate(); //$c->Get_Category(); $ttt= $c->getFlush($id,’0′,’3′); echo $ttt; echo “</select>”;<br />
?><br />
<br />
PHP笔试题 <br />
1. 写出如下程序的输出结果<br />
<!--?<br /-->
$str1 = null;<br />
$str2 = false;<br />
echo $str1==$str2 ? ‘相等’ : ‘不相等’;<br />
//相等<br />
$str3 = ”;<br />
$str4 = 0;<br />
echo $str3==$str4 ? ‘相等’ : ‘不相等’;<br />
//相等<br />
$str5 = 0;<br />
$str6 = ‘0′;<br />
echo $str5===$str6 ? ‘相等’ : ‘不相等’;<br />
//不相等<br />
?><br />
2. 写出如下程序的输出结果<br />
<!--?<br /-->
$a1 = null;<br />
$a2 = false;<br />
$a3 = 0;<br />
$a4 = ”;<br />
$a5 = ‘0′;<br />
$a6 = ‘null’;<br />
$a7 = array();<br />
$a8 = array(array());<br />
echo empty($a1) ? ‘true’ : ‘false’;//true<br />
echo empty($a2) ? ‘true’ : ‘false’;//true<br />
echo empty($a3) ? ‘true’ : ‘false’;//true<br />
echo empty($a4) ? ‘true’ : ‘false’;//true<br />
echo empty($a5) ? ‘true’ : ‘false’;//true<br />
echo empty($a6) ? ‘true’ : ‘false’;//false<br />
echo empty($a7) ? ‘true’ : ‘false’;//true<br />
echo empty($a8) ? ‘true’ : ‘false’;//false<br />
?><br />
3. 写出如下程序的输出结果<br />
<!--?<br /-->
$test = ‘aaaaaa’;<br />
$abc = & $test;<br />
unset($test);<br />
echo $abc;//’aaaaaa’<br />
?><br />
4. 写出如下程序的输出结果<br />
<!--?$count = 5;<br /-->
function get_count(){<br />
static $count = 0;<br />
return $count++;<br />
}<br />
echo $count; //5<br />
++$count;<br />
echo get_count();//0<br />
echo get_count();//1<br />
?><br />
5. 写出如下程序的输出结果<br />
<!--?<br /-->
$GLOBALS['var1'] = 5;<br />
$var2 = 1;<br />
function get_value(){<br />
global $var2;<br />
$var1 = 0;<br />
return $var2++;<br />
}<br />
get_value();<br />
echo $var1; //0<br />
echo $var2; //2<br />
?><br />
6. 写出如下程序的输出结果<br />
<!--?<br /-->
function get_arr($arr){<br />
unset($arr[0]);<br />
}<br />
$arr1 = array(1, 2);<br />
$arr2 = array(1, 2);<br />
get_arr(&$arr1);<br />
get_arr($arr2);<br />
echo count($arr1);//1<br />
echo count($arr2);//2<br />
?><br />
同类</p>