5. Lists the following types of signed and unsigned range TINYINT SMALLINT mediumint INT
tinyint-2^7-2^7-10 ~ 2^8-1
smallint-2^15-2^15-1 0 ~ 2^16-1
mediumint-2^23-2^23-1 0 ~ 2^24-1
int-2^31-2^31-1 0 ~ 2^32-1
6. Assemble the following array in one line as a string I am milo! Day Day up!
<?php
$arr = Array (
' I ', ' AM ', ' milo! ', ' Day ', ' Day ', ' up! '
);
?>
$str = Strtolower (Implode ("", $arr));
7. Call the following function to get the function and get the value of Count
<?php
function get_list ($cnd = Array (), & $count = False)
{
//Pseudocode handles $CND and assigns value datas
$datas = ' I am call back ';
$count && $count = rand (1, 10000);
return $datas;
}
?>
$count = 1;
$data = get_list ($cnd,& $count);
Echo $count;
8. Several ways to replace the session mechanism, a simple description of their pros and cons
MySQL, memcache, cookies keep a unique status identification code
9. The following HTTP status codes appear as possible causes and how to handle
200, 301, 404, 502, 503
200
The
request was successful and the response header or the data body that the request expects will be returned with this response.
301
The requested resource has been permanently moved to the new location, and any future references to this resource should be one of several URIs returned with this response. If possible, clients with link-editing capabilities should automatically modify the requested address to the address returned from the server. Unless otherwise specified, this response is also cacheable. The new permanent URI should be returned in the Location domain of the response. Unless this is a head request, the responding entity should contain a hyperlink to the new URI and a short description. If this is not a get or head request, the browser prohibits automatic redirection unless the user confirms it because the condition of the request may change. Note: For some browsers that use the HTTP/1.0 protocol, the next redirection request becomes a get mode when the POST request they send gets a 301 response.
404
The
request failed, and the requested resource was not found on the server. There is no information to tell the user whether the situation is temporary or permanent. If the server knows the situation, it should use a 410 status code to inform the old resource because of some internal configuration mechanism problems, is permanently unavailable, and there is no address to jump. 404 This status code is widely used in situations where the server does not want to reveal exactly why the request was rejected or if no other appropriate response was available.
502
An invalid response was received from the upstream server when a server working as a gateway or proxy attempted to execute a request.
503
the server is currently unable to process requests due to temporary server maintenance or overloading. This condition is temporary and will be restored after a period of time. If the latency can be predicted, then a retry-after header can be included in the response to indicate the delay time. If this retry-after information is not given, the client should handle it in a way that handles 500 responses. Note: The presence of a 503 status code does not mean that the server must use it when it is overloaded. Some servers simply want to deny client connections.
OK all right, the answer document for Get and post requests follows.
Moved permanently customer requested document elsewhere, the new URL is given in the location header, and the browser should automatically access the new URL
404 Not Found Cannot find the resource at the specified location. This is also a common answer.
502 Bad Gateway server, as a gateway or proxy, accesses the next server in order to complete the request, but the server returns an illegal reply.
503 Service Unavailable Server failed to answer due to maintenance or overload. For example, a servlet might return 503 if the database connection pool is full. The server can provide a retry-after header when it returns 503.
10. Have the following database, with the original eco-MySQL extension to connect and query the user table of the first 10 lines
host:192.168.0.254
port:3306
User:one
pass:piece
Database:db_user
Table:user
$link = mysql_connect ("192.168.0.254:3306", "one", "piece") or Die (' could not connect: '. Mysql_error ());
mysql_select_db (' Db_user ', $link);
$query = mysql_query ("SELECT * from User limit 10");
while ($rs = Mysql_fetch_array ($query, MYSQL_ASSOC))
{}
11. AutoLoad ($class) implements the automatic loading of classes under the Lib directory and can be compatible with subdirectories
12. With Set_error_handle to catch errors and output, the level of their own set
Set_error_handle (callback,level)
function Callback (int $errno, String $errstr [, String $errfile [, int $errline [, array $errcontext]]] {
}
function Dealerrorhandler ($errno, $errstr, $errfile, $errline)
{
switch ($errno) {
Case E_user_error:
echo "error [$errno] $errstr fatal error on line $errline in file $errfile";
break;
Case e_user_warning:
echo "My warning [$errno] $errstr":
break;
Case E_user_notice:
echo "My notice[$errno] $errstr";
break;
Default:
echo "UNKONWN error type: [$errno] $errstr";
break;
}
}
Set_erro_handler (Dealerrorhandler);
trigger_error ("notice", e_user_notice);
trigger_error ("Warning", e_user_warning);
trigger_error ("error", E_user_error);
13. A brief description of two kinds of notice warning methods for blocking PHP programs
Initialize the variable, the file starts setting the error level or modifies the php.ini settings error_reporting
Set_error_handler and @ suppression error
1. Add in the program: error_reporting (E_all & ~e_notice);
2. Or modify php.ini: error_reporting = E_all
changed to: error_reporting = e_all & ~e_notice
3.error_reporting (0) or modify Php.inidisplay_errors=off
14. The role of instanceof, often in what design mode to use
A single case pattern, but other patterns will also be used for
15. 1023 in binary notation and a brief description of the computational process
10-2
1023%2=1
511%2 = 1
255%2 = 1
127%2 = 1
63%2 = 1
31%2 = 1
15%2 = 1
7%2 = 1
3%2 = 1
1%2 = 1
0 = 0
-------------------------------------------
1023
2^9=<n<2^10
511
k=9
10 9 8 7 6 5 4 3 2 1
1 1 1 1 1 1 1 1 1 1
----------------------
1023 1
1023-1/2=511 1
511-1/2=255 1
255-1/2=127 1
127-1/2=63 1
63-1/2=31 1
31-1/2=15 1
15-1/2=7 1
7-1/2=3 1
3-1/2=1 1
-----------------------------------------------
2-10
Just start with the number on each bit of the binary number from the far right, the first number on the right is multiplied by the number of 0 times two, the second is multiplied by the second, the third is multiplied by the two of the second, and then the number of n is multiplied by the second (n-1), and then the resulting result is added to the
2 * Example after writing, originally thought that finished, the result met someone asked Call_user_func_array (), looked at the manual
3 * Originally, the test function above can also be condensed into the following example,
4 * *
5 function Otest1 ($a)
6 {
7 echo (' one parameter ');
8}
9
function Otest2 ($a, $b)
11 {
Echo (' two parameters ');
13}
14
function Otest3 ($a, $b, $c)
16 {
Echo (' three ");
18}
19
function otest ()
21 {
$args =func_get_args ();
$num =func_num_args ();
call_user_func_array (' otest '. $num, $args);
25}
26
otest (1,2);
19. In a function (the function has no return statement) inside to handle the global variable, and change his value, in two ways to implement (Global and Reference &)
$var = 1;
function Get_pra ()
{
Global $var;
$var = ' xxx ';
Echo $var;
}
echo $var. '--';
Get_pra ();
Echo $var;
----------------------------------
$test = 1;
$test 1 = 2;
function Get_yinyong ()
{
Global $test 1;
$GLOBALS ["Test"] = & $test 1;
}
echo $test. " \ n ";
Get_yinyong ();
Echo $test;
----------------------------
20. In the application we often encounter in the user table randomly tuned 10 data to display the situation, briefly describe how you implement the function, you can not use SQL functions and statements
table User Field UID, username
estimates a user table in the interval, in this interval with PHP to a random number, the SQL statement is greater than or less than this ID to limit dozens of (to ensure 10 data), and then not enough scattered words, take out the data shuffle function to disrupt the array, Array_ Rand immediately takes out 10
21. Let's say the UID in the following SQL statement gets a specific value, and after the following statement query the order of the UID, how to sort by the order of the UID in input
Select uid from user where UID in (10, 1, 3, 8, 11, 4, 7);
considerable result is 1,3,4,7,8,10,11 ascending, there is a special situation is not sure because some of the middle of the ID of the direct modification may not be ascending, if the order in the UID in sequence needs to be recycled according to the ID to get the value of the query results array into the new array can be
22. Use PHP to replace the letters in a string with * *
preg_replace ('/[a-za-z]*/', ' * * ', $STR);
if the specified character can be str_replace (' Ooxx ', ' * * ', $STR);
23. What is the result of printing in the 2.php below? Why? Execution Order 1.php->2.php
Cookie,cookie time is a problem. Times () +3600
24. A brief description of PHP commonly used JSON encoding function, how to decode the JSON back to the array
25. When MySQL has '/' in SQL statements, what to do with each specific value of the SQL statement
mysql_real_escape_string
26. How to set header header information in PHP
header (');
27. There are a few scripts below, please 2.php output results
1.php
<?php
setcookie (' Test ', ' cookie_test ', 3600);
?>
2.php
<?php
$cookie = isset ($_cookie[' test '))? $_cookie[' test ': ' COOKIE ';
Echo $cookie;
?>
I am here
1
Summary
A. If an include or include_once is not called in a function or method, the output is the same.
B. If an include or include_once is invoked in a function or method, it is important to note that if you want to have results for the second and subsequent calls, you must use include instead of include_once.
28. Briefly describe the function
of Call_user_func
calls a function or a function inside a class, returning the value of the first argument. Similar functions Call_user_func_array
29. Visit assumed Nginx has been configured server_name www.120.net xxx.120.net
visit after asking http://www.120.net/index.php and http://xxx.120.net/index.php
What are the
$_server["SERVER_NAME"] and $_server["Request_uri"] respectively
www.120.net xxx.120.net
/index.php/index.php
30. The properties of a file under Linux are drwxr-xr-x with numbers to indicate that their permissions are
Directory permission is 755 owner u have read and write modify permissions belong to Group G have read, modify permissions of the group O with reading and modification permissions
31. The 1Mbps theoretical download speed of broadband is how many kbps, calculated by the method
1*1024/8
1m=1024kb
1kb=1024b
1b=8bit
Part II
1. Simple implementation of a single example + Factory design Pattern abstract class example{//The parameterized factory method public static function factory ($type) {if Clude_once ' drivers/'. $type. '. php ') {
$classname = ' driver_ '. $type;
return new $classname;
} else {
throw new Exception (' Driver not found ');
}
}}//Load a MySQL driver$mysql = example::factory (' mysql ');
//Load a SQLite Driver
$sqlite = example::factory (' SQLite ');
definded (' DRIVER ', '/data/wwwroot/www.want.com/core/driver/'); abstract class Example () {Private Function __construct () {} public static function factory ($type) {if include_once (DRIVER. $type. '). php ')) {return Exampleson::singleton ($type);} else {throw new Exception ("Driver are not found!");} }class Exampleson implements example{//Hold An instance of the class private static $instance;//static private classes instance//A private C Onstructor; Prevents direct creation of object private function __construct () {echo ' I am constructed ';}//The Singleton Method pub Lic static function singleton () {if!isset (self:: $instance) {//If no static private class instance is set, create $c = __class__;//Get Class name self:: $instan CE = new $c} return self:: $instance; }//Example method Public Function bark () {echo ' woof! ';}//Prevent users to clone the instance public function __clon E ()//not allowed to be cloned {Trigger_error (' clone is not allowed. ', e_user_error);
}} Keywords:
1 private static member variable
2 __class__ Get the current class name
3 public static method to obtain single case
4 covers the __clone () method
----10 Words: private static amount, public static method--------
2. Examples of several common magic methods, and explain the role? How do I display our custom content when I print an object?
Magic Function
1. __construct ()
is invoked when the object is instantiated,
when __construct and a function with the class name as the function name exist at the same time, __construct is invoked and the other is not invoked.
2. __destruct ()
is invoked when an object or object operation is terminated.
3. __call ()
The
object invokes a method,
If the method exists, it is called directly;
If
does not exist, it will call the __call function.
4. __get ()
read an object's properties,
If the attribute exists, the property value is returned directly;
If
does not exist, the __get function is called.
5. __set ()
set the properties of an object,
If the attribute exists, then directly assigns a value;
If
does not exist, the __set function is called.
6. __tostring ()
is invoked when an object is printed. such as Echo $obj, or print $obj;
7. __clone ()
is invoked when the object is cloned. such as: $t =new Test (); $t 1=clone $t;
8. __sleep ()
serialize before being invoked. If the object is relatively large, want to cut a little bit of the serialization, you can consider this function.
9. __wakeup ()
Unserialize is invoked to do initialization work on some objects.
10. __isset ()
is invoked when it detects whether an object's properties exist. such as: Isset ($c->name).
11. __unset ()
is invoked when unset an object's properties. such as: unset ($c->name).
12. __set_state ()
Called when the
calls Var_export. Use the return value of the __set_state as the return value of the Var_export.
13. __autoload ()
when an object is instantiated, the method is invoked if the corresponding class does not exist.
Magic Constant
1. __line__
returns the current line number in the file.
2. __file__
returns the full path and file name of the file. If used in the include file, the include file name is returned. Since PHP 4.0.2, __file__ always contains an absolute path, and the previous version sometimes contains a relative path.
3. __function__
returns the function name (PHP 4.3.0 new). From PHP 5 This constant returns the name (case-sensitive) of the function when it is defined. This value is always lowercase in PHP 4.
4. __class__
Returns the name of the class (PHP 4.3.0 new). From PHP 5 This constant returns the name of the class when it is defined (case-sensitive). This value is always lowercase in PHP 4.
5. __method__
returns the method name of the class (PHP 5.0.0 new). Returns the name (case-sensitive) of the method when it is defined.
3. Comparison of class static method and instantiation class method and its advantages and disadvantages
4. There is a forum
threads table records topics and headings, and other information
posts table records the content of the subject and the content of the reply
Threads Table Primary key is Tid
posts table primary key is PID and the subject is labeled Tid
the threads and posts a pair of tid through the
now the amount of data posts table reached 100 million, threads table 20 million, about a subject has 5 replies
Please design the table, Posts table and threads table for MySQL
5. Now there is a MySQL main library/Concou, I would like to ask PHP MySQL query how the PHP program in the implementation of master-slave separation? What is the advantage of master-slave separation to configure the master-slave array file, their own seal to several model functions, query loading slave configuration instantiation, the operation of the destruction of data to add master to instantiate the advantages: increased concurrent load capacity, conducive to data maintenance and security, improve usability disadvantage: Data synchronization some delay
6. Brief introduction of Ucenter single sign-on mechanism
so-called single sign-on, nothing more than a number of sites sharing a user center, to achieve synchronous landing, synchronous exit.
in fact, the user will eventually login, just using AJAX (JavaScript uses SRC asynchronous Cross-domain call) the user would not find.
and the use of the P3P header to achieve, different domain names, single sign-on (Ucenter used cookies)
disadvantage is the use of Ajax customer service-side request, if there are more than 10 applications, login speed slowed down.
7. Linux related has a package http://www.120.net/test-1.0.0.tar.gz
A. Download it to/usr/local/src
B. Install its source code into the/usr/local/test directory
c. He relies on the MySQL package, located in the/usr/local/mysql directory
9. Brief description of the queue, the principle of the stack
can be seen as a one-dimensional array to operate, the queue advanced first out, only columns in the column header, into the column only at the end of the column, the stack is LIFO, into the stack and out of the stack are from the top of the stack
What does a stack work?
The
stack is an abstract data structure whose operating mechanism is LIFO. When you push a new item onto the stack, any item already inside the stack will be pressed to the bottom of the stack. Similarly, moving an entry out of the stack will cause other entries in the stack to move to the top of the stack. Only the topmost entries in the stack are removed from the stack, and the order in which entries leave the stack is the same as the order in which they are pushed. You might as well recall the loading and unloading process of the vending machine.
10. Arrayaccess is defined as follows to implement an array
arrayaccess {
/* Methods * *
Abstract Public boolean offsetexists (string $offset)
Abstract Public Mixed Offsetget (string $offset)
abstract public void Offsetset (string $offset, string $value)
abstract public void Offsetunset (string $offset)
}
Class single implements arrayaccess{private $name; private static $_instance = null; Private function __construct () {} s tatic function Load () {if (null = = self::$_instance) {self::$_instance = new single ();} return self::$_instance;} publi C function SetName ($name) {$this->name = $name;} public Function GetName () {return $this->name;}/** * Implement four methods * Offsetexists (), used to identify whether an element is defined * Offsetget (), to return the value of an element * Offsetset (), to set a new value for an element * Offsetunset (), to delete an element and corresponding value **/ Public Function Offsetset ($offset, $value) {if (Is_null ($offset)) {$this->container[] = $value;} else {$this->co ntainer[$offset] = $value; The Public Function Offsetget ($offset) {return isset ($this->container[$offset])? $this->container[$offset]: null ; The Public Function offsetexists ($offset) {return isset ($this->container[$offset]);} The Public function Offsetunset ($ Offset) {unset ($this->container[$offset]);} $s = single::load (); $s->setname ("Jack") $s ["name"] = "Mike"; Echo $s->getname(); Jackecho $s ["name"]; Mike
11. Suppose the Coreseek installation directory is/usr/local/coreseek
c. Rebuilding the index (ensuring that the search service is still available during the rebuild)
indexer-c/usr/local/coreseek/etc/test.conf--allsearchd-c/usr/local/coreseek/etc/test.conf indexer-c Local/coreseek/etc/test.conf--all--rotate12. Suppose you have a posts post table that Sphinx incremental quasi real time index to the table, describing your scenario
has a simple implementation using the "primary index + Incremental Index" method. Add a Count table in the database that records the last data ID of the indexed table each time the primary index is rebuilt, so that only the data after this ID will be indexed in the incremental index, and the table will be updated each time the primary index is rebuilt.
14. The following code is used to obtain client Ip:if (getenv (' http_client_ip ') && strcasecmp (getenv (' http_client_ip '), ' unknown ')) {$ Onlineip = getenv (' http_client_ip ');} ElseIf (getenv (' http_x_forwarded_for ') && strcasecmp (getenv (' http_x_forwarded_for '), ' unknown ') {$onlineip = getenv (' http_x_forwarded_for ');} ElseIf (getenv (' remote_addr ') && strcasecmp (getenv (' remote_addr '), ' unknown ')) {$onlineip = getenv (' Remote_ ADDR ');} ElseIf (Isset ($_server[' remote_addr ']) && $_server[' remote_addr '] && strcasecmp ($_server[' Remote_ ADDR '], ' unknown ') {$onlineip = $_server[' remote_addr '];} But with HTTP_ start of the request header is the client can forge information, in the reverse proxy environment, how to ensure that PHP will not receive forged HTTP_CLIENT_IP, http_x_forwarded_for value?
15. For example, Google,baidu and other large web sites, when the use of different clients (such as mobile phone and PC) access to the same URL, the rendering of the page is not the same, this is what principle? If you can give a practical solution, you can add points.
simple can be judged by user_agent, but its preliminary
can use the server or mobile phone terminal features or WAP gateway accept information, etc.
16. MAGIC_QUOTES_GPC and Magic_quotes_runtime values in production environment php.ini should be set why? Onoff17. PHP can use file_get_contents when invoking a remote HTTP interface, but when the remote host is unreachable or the response is slow, the local PHP process is suspended for a long time, which affects the stability of the local server, and how to avoid timeouts when the PHP process is suspended for a long time?
File_get_contents can set the next timeout time $ctx = stream_context_create (Array (' HTTP ' => array (' timeout ' => 1
Curl Implementation to obtain the remote HTTP interface can also be set time-out time curl_setopt ($s, curlopt_timeout, $timeout);
18. How do I prevent DNS queries from slowing down to timeout? MySQL Character set names * command What are the values of the system variables? (ACE) A, character_set_client B, Character_set_system C, Character_set_results D, Character_set_server E, Character_set_ Connection F, Character_set_database20. Which of the following collation rules are not case-sensitive? (a) A, utf8_general_ci B, Utf8_general_cs C, Utf8_general_bin21. How to eliminate XSS attacks?
strip_tags can be initially filtered, or write their own filter functions for special tags for processing, with the ASCII code to replace 23. How to prevent CSRF attack?
In the Web application side defense csrf vulnerabilities, generally using Referer, token or authentication code, TOKENF way or more trustworthy
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