PHP经典面试题集锦

$a = date("Y-m-d H:i:s", strtotime("-1 day"));
print_r($a);

$arr = array("key"=>"value");
print_r($arr);

<?php
function reverse($str)
{
$ret = "";
len=mbstrwidth(str,"GB2312");
for(i=0;i< len;i++)
{
arr[]=mbsubstr(str, $i, 1, "GB2312");
}
return implode("", array_reverse($arr));
}
print_r(reverse("你好"));

CURRENT_TIMESTAMP()
DATE_FORMAT()
select DATE_FORMAT("2011-11-21 10:10:10", "%Y-%m-%d");

mb_substr($str, 1, 1, "GB2312");

header("HTTP/1.0 404 Not Found");

header("Status: 404 Not Found");

$a = <<EOD
good test
EOD;

$str = "jianfeng@126.com";
regex="([a−z0−9.−]+)@([da−z.−]+).([a−z.]2,6)" ; //正则
return preg_match(regex,str)

window.location.href="#"
<script src="#"></script>

class myclass
{
}

$myclass = new myclass();

<?php
class A
{
public $name = "A";
}
$a = new A();
n=a->name;
print_r($n);

<?php
mysql_connect("localhost", "mysql_user", "mysql_password") or
die("Could not connect: " . mysql_error());
mysql_select_db("mydb");
$result = mysql_query("SELECT id, name FROM mytable");
while (row=mysqlfetcharray(result, MYSQL_ASSOC)) {
printf ("ID: %s Name: %s", row["id"],row["name"]);
}
mysql_free_result($result);

echo "{html}"
echo <<EOD
{html}
EOD;

$num = 10;
function multiply(){
num=num * 10;
}
multiply();
echo $num;
?>

$mysql_db=mysql_connect("local","root","pass");
@mysql_select_db("DB",$mysql_db);
$sql = sprintf("select * from %s where UserName = '%s'",
"表名",
"张三");
values=mysqlquery(sql);
while(item=mysqlfetchqueryarray(values))
{
echo sprintf("用户名：%s, 电话 %s, 学历： %s, 毕业日期： %s",
item['UserName'],item['Tel'], item['Content'],item['Date']
);
}

class test{
function Get_test($num){
num=md5(md5(num)."En");
return $num;
}
}
$test = new test();
ret=test->Get_test(11);
print_r($ret);exit;

$b=201;
$c=40;
a=b>$c?4:5;
echo $a;

mysql_num_rows()

print_r($arr[0]);
reset($arr);
print_r(current($arr));
print_r(array_shift($arr));

$a[0];
substr($a, 0, 1);

public function __construct()
{
}
public function __destruct()
{
}

<?php
$url = "http://www.sina.com.cn/abc/de/fg.php?id=1";
arr=parseurl(url);
pathArr=pathinfo(arr['path']);
print_r($pathArr['extension']);

<?php
$a = '/a/b/c/d/e.php';
$b = '/a/b/12/34/c.php';
//获取path相对于conpath的相对路径
function sGetRelativePath(path,conpath)
{
pathArr=explode("/",path);
conpathArr=explode("/",conpath);
$dismatchlen = 0;
for(i=0;i < count(pathArr);i++)
{
if(conpathArr[i] != pathArr[i])
{
dismatchlen=count(pathArr) - $i;
arrLeft=arrayslice(pathArr, $i);
break;
}
}
ret=strrepeat("../",dismatchlen).implode("/", $arrLeft);
return $ret;
}
print_r(sGetRelativePath(b,a));

<?php
function aGetAllFile($folder)
{
$aFileArr = array();
if(is_dir($folder))
{
handle=opendir(folder);
while((file=readdir(handle)) !== false)
{
//如果是.或者..则跳过
if(file=="."||file == "..")
{
continue;
}
if(is_file(folder."/".file))
{
aFileArr[]=file;
}
else if(is_dir(folder."/".file))
{
aFileArr[file] = aGetAllFile(folder."/".file);
}
}
closedir($handle);
}
return $aFileArr;
}
$path = "/home/test/sql";
print_r(aGetAllFile($path));