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Thursday, 30 June 2016
Sunday, 29 May 2016
php sessions
03:33
No Comments
cdAn option approach to make information available over the different pages of a whole site is to utilize a PHP Session.
A session makes a record in a provisional catalog on the server where enlisted session variables and their qualities are put away. This information will be accessible to all pages on the site amid that visit.
The area of the transitory document is controlled by a setting in the php.ini record called session.save_path. Bore utilizing any session variable ensure you have setup this way.
At the point when a session is begun taking after things happen −
PHP first makes an extraordinary identifier for that specific session which is an irregular string of 32 hexadecimal numbers, for example, 3c7foj34c3jj973hjkop2fc937e3443.
A treat called PHPSESSID is consequently sent to the client's PC to store extraordinary session recognizable proof string.
A record is consequently made on the server in the assigned transitory catalog and bears the name of the remarkable identifier prefixed by sess_ ie sess_3c7foj34c3jj973hjkop2fc937e3443.
At the point when a PHP script needs to recover the quality from a session variable, PHP consequently gets the exceptional session identifier string from the PHPSESSID treat and after that looks in its brief index for the record bearing that name and an acceptance should be possible by contrasting both qualities.
A session finishes when the client loses the program or in the wake of leaving the site, the server will end the session after a foreordained timeframe, usually 30 minutes span.
Beginning a PHP Session
A PHP session is effectively begun by making a call to the session_start() function.This work first checks if a session is as of now begun and if none is begun then it begins one. It is prescribed to put the call to session_start() toward the start of the page.
Session variables are put away in acquainted cluster called $_SESSION[]. These variables can be gotten to amid lifetime of a session.
The accompanying illustration begins a session then enlist a variable called counter that is increased every time the page is gone to amid the session.
Make utilization of isset() capacity to check if session variable is as of now set or not.
Put this code in a test.php document and load this record commonly to see the outcome −
<?php
session_start();
on the off chance that( isset( $_SESSION['counter'] ) {
$_SESSION['counter'] += 1;
}else {
$_SESSION['counter'] = 1;
}
$msg = "You have gone by this page ". $_SESSION['counter'];
$msg .= "in this session.";
?>
<html>
<head>
<title>Setting up a PHP session</title>
</head>
<body>
<?php reverberation ( $msg ); ?>
</body>
</html>
It will deliver the accompanying result −
Pulverizing a PHP Session
A PHP session can be devastated by session_destroy() capacity. This capacity does not require any contention and a solitary call can devastate all the session variables. In the event that you need to pulverize a solitary session variable then you can utilize unset() capacity to unset a session variable.
Here is the case to unset a solitary variable −
<?php
unset($_SESSION['counter']);
?>
Here is the call which will crush all the session variables −
<?php
session_destroy();
?>
Turning on Auto Session
You don't have to call start_session() capacity to begin a session when a client visits your site on the off chance that you can set session.auto_start variable to 1 in php.ini document.
Sessions without treats
There might be a situation when a client does not permit to store treats on their machine. So there is another strategy to send session ID to the program.
On the other hand, you can utilize the steady SID which is characterized if the session began. In the event that the customer did not send a suitable session treat, it has the structure session_name=session_id. Else, it extends to a void string. Along these lines, you can insert it unequivocally into URLs.
The accompanying case exhibits how to enlist a variable, and how to interface effectively to another page utilizing SID.
<?php
session_start();
on the off chance that (isset($_SESSION['counter'])) {
$_SESSION['counter'] = 1;
}else {
$_SESSION['counter']++;
}
$msg = "You have gone to this page ". $_SESSION['counter'];
$msg .= "in this session.";
reverberation ( $msg );
?>
<p>
To proceed with snap taking after connection <br/>
<a href = "nextpage.php?<?php reverberation htmlspecialchars(SID); ?>">
</p>
A session makes a record in a provisional catalog on the server where enlisted session variables and their qualities are put away. This information will be accessible to all pages on the site amid that visit.
The area of the transitory document is controlled by a setting in the php.ini record called session.save_path. Bore utilizing any session variable ensure you have setup this way.
At the point when a session is begun taking after things happen −
PHP first makes an extraordinary identifier for that specific session which is an irregular string of 32 hexadecimal numbers, for example, 3c7foj34c3jj973hjkop2fc937e3443.
A treat called PHPSESSID is consequently sent to the client's PC to store extraordinary session recognizable proof string.
A record is consequently made on the server in the assigned transitory catalog and bears the name of the remarkable identifier prefixed by sess_ ie sess_3c7foj34c3jj973hjkop2fc937e3443.
At the point when a PHP script needs to recover the quality from a session variable, PHP consequently gets the exceptional session identifier string from the PHPSESSID treat and after that looks in its brief index for the record bearing that name and an acceptance should be possible by contrasting both qualities.
A session finishes when the client loses the program or in the wake of leaving the site, the server will end the session after a foreordained timeframe, usually 30 minutes span.
Beginning a PHP Session
A PHP session is effectively begun by making a call to the session_start() function.This work first checks if a session is as of now begun and if none is begun then it begins one. It is prescribed to put the call to session_start() toward the start of the page.
Session variables are put away in acquainted cluster called $_SESSION[]. These variables can be gotten to amid lifetime of a session.
The accompanying illustration begins a session then enlist a variable called counter that is increased every time the page is gone to amid the session.
Make utilization of isset() capacity to check if session variable is as of now set or not.
Put this code in a test.php document and load this record commonly to see the outcome −
<?php
session_start();
on the off chance that( isset( $_SESSION['counter'] ) {
$_SESSION['counter'] += 1;
}else {
$_SESSION['counter'] = 1;
}
$msg = "You have gone by this page ". $_SESSION['counter'];
$msg .= "in this session.";
?>
<html>
<head>
<title>Setting up a PHP session</title>
</head>
<body>
<?php reverberation ( $msg ); ?>
</body>
</html>
It will deliver the accompanying result −
Pulverizing a PHP Session
A PHP session can be devastated by session_destroy() capacity. This capacity does not require any contention and a solitary call can devastate all the session variables. In the event that you need to pulverize a solitary session variable then you can utilize unset() capacity to unset a session variable.
Here is the case to unset a solitary variable −
<?php
unset($_SESSION['counter']);
?>
Here is the call which will crush all the session variables −
<?php
session_destroy();
?>
Turning on Auto Session
You don't have to call start_session() capacity to begin a session when a client visits your site on the off chance that you can set session.auto_start variable to 1 in php.ini document.
Sessions without treats
There might be a situation when a client does not permit to store treats on their machine. So there is another strategy to send session ID to the program.
On the other hand, you can utilize the steady SID which is characterized if the session began. In the event that the customer did not send a suitable session treat, it has the structure session_name=session_id. Else, it extends to a void string. Along these lines, you can insert it unequivocally into URLs.
The accompanying case exhibits how to enlist a variable, and how to interface effectively to another page utilizing SID.
<?php
session_start();
on the off chance that (isset($_SESSION['counter'])) {
$_SESSION['counter'] = 1;
}else {
$_SESSION['counter']++;
}
$msg = "You have gone to this page ". $_SESSION['counter'];
$msg .= "in this session.";
reverberation ( $msg );
?>
<p>
To proceed with snap taking after connection <br/>
<a href = "nextpage.php?<?php reverberation htmlspecialchars(SID); ?>">
</p>
SQL LITE TUTORIALS
03:32
No Comments
This instructional exercises helps you to comprehend what is SQLite, how it contrasts from SQL, why it is required and the route in which it handles the applications Database.
SQLite is a product library that actualizes an independent, serverless, zero-setup, value-based SQL database motor. SQLite is one of the quickest developing database motors around, however that is development as far as fame, not anything to do with its size. The source code for SQLite is in people in general space.
What is SQLite?
SQLite is an in-procedure library that executes an independent, serverless, zero-setup, value-based SQL database motor. It is the one database, which is zero-designed, that implies like other database you don't have to arrange it in your framework.
SQLite motor is not a standalone procedure like different databases, you can interface it statically or progressively according to your prerequisite with your application. The SQLite gets to its stockpiling documents straightforwardly.
Why SQLite?
SQLite does not require a different server procedure or framework to operate.(serverless).
SQLite accompanies zero-arrangement, which implies no setup or organization required.
A complete SQLite database is put away in a solitary cross-stage circle record.
SQLite is little and light weight, under 400KiB completely designed or under 250KiB with discretionary components discarded.
SQLite is independent, which implies no outside conditions.
SQLite exchanges are completely ACID-agreeable, permitting safe access from numerous procedures or strings.
SQLite underpins a large portion of the inquiry dialect highlights found in the SQL92 (SQL2) standard.
SQLite is composed in ANSI-C and gives basic and simple to-use API.
SQLite is accessible on UNIX (Linux, Mac OS-X, Android, iOS) and Windows (Win32, WinCE, WinRT).
History:
2000 - D. Richard Hipp had composed SQLite with the end goal of no organization required for working a project.
2000 - In August SQLite 1.0 discharged with GNU Database Manager.
2011 - Hipp declared to add UNQl interface to SQLite DB and to create UNQLite (Document situated database).
SQLite Limitations:
There are couple of unsupported elements of SQL92 in SQLite which are demonstrated as follows:
Feature Description
RIGHT OUTER JOIN Only LEFT OUTER JOIN is executed.
FULL OUTER JOIN Only LEFT OUTER JOIN is executed.
Modify TABLE The RENAME TABLE and ADD COLUMN variations of the ALTER TABLE order are bolstered. The DROP COLUMN, ALTER COLUMN, ADD CONSTRAINT not upheld.
Trigger support FOR EACH ROW triggers are bolstered yet not FOR EACH STATEMENT triggers.
VIEWs VIEWs in SQLite are perused as it were. You may not execute a DELETE, INSERT, or UPDATE proclamation on a perspective.
Award and REVOKE The just get to consents that can be connected are the ordinary document access authorizations of the fundamental working framework.
SQLite Commands:
The standard SQLite charges to interface with social databases are comparable as SQL. They are CREATE, SELECT, INSERT, UPDATE, DELETE and DROP. These charges can be ordered into gatherings in light of their operational nature:
DDL - Data Definition Language:
Command Description
CREATE Creates another table, a perspective of a table, or other article in database
ALTER Modifies a current database article, for example, a table.
DROP Deletes a whole table, a perspective of a table or other article in the database.
DML - Data Manipulation Language:
Command Description
INSERT Creates a record
UPDATE Modifies records
DELETE Deletes records
DQL - Data Query Language:
Command Description
SELECT Retrieves certain records from one or more tables
