PHP Introductory Tutorial Session control tips (cookies and sessions) _php tips

This example describes the PHP session control techniques. Share to everyone for your reference, specific as follows:

demo1.php

<form method= "Get" action= "demo2.php" >
  name: <input type= "text" name= "username"/> <br/>
  < Input type= "Submit" value= "submitted"/>
</form>

demo2.php

<?php
  //echo $_post[' username '];
  If the form takes a get transmission, then the acceptance must take the
  echo $_get[' username '];
  What kind of better.????
  //$_post['];  More secure
?>

demo3.php

<?php
  //Create a cookie
  //cookie is to save a small file in your client file that contains the information you log on
  //setcookie can create a client's cookie file
  / The first parameter represents the name of the cookie, and the second parameter represents the value of the cookie name
  //The so-called end of the session, when you have this browser closed, there is no, automatically delete
  //Create a containing expired cookies, The expiration time takes the current timestamp + seconds
  //time () + (7*24*60*60) indicates that the next 7 days
  //Once Setcookie has changed, a refreshing browser will overwrite the old cookie
  Setcookie ( ' Name ', ' Onestopweb ', Time () + (7*24*60*60));
? >

demo4.php

<?php
  Setcookie (' name ', ' Onestopweb ');
  Read the cookie for this machine, use a super global variable $_cookie
  //Inside put cookie name can
  //have a feature, Setcookie is not generated in time, it will slow a beat
  //ps: Slow A beat, the first time refresh, Just the build covers the original.
  //But get the previous one, and the second refresh can be really acquired.
  //echo $_cookie[' name '];
  Use the variable detection function to determine if the cookie exists
  if (isset ($_cookie[' name ')) {
    echo $_cookie[' name '];
  } else{
    Echo ' does not exist for this user ';
  }
? >

demo5.php

<?php
  //Delete cookie
  setcookie (' name ', ' Onestopweb ');
  Remove this cookie in the middle
  //Set this value to NULL to
  //setcookie (' name ', ');
  I adjust the expiration time to the current time less than a second, then is equal to the expiration of the
  Setcookie (' name ', ' Onestopweb ', Times ()-1);
  echo $_cookie[' name '];
? >

demo6.php

<form method= "POST" action= "demo7.php" >
  name: <input type= "text" name= "username"
  /> <br/> <input type= "Submit" value= "submitted"/>
</form>

demo7.php

<?php
  //If the name specifies the same name, then generate a cookie
  //Complete login
  if (isset ($_post[' username ')) && $_post[' Username ']== ' onestopweb ') {
    //If correct, I generate a cookie and then jump
    setcookie (' name ', ' web ');
    Header (' Location:Demo8.php ');
  } else{
    Header (' Location:Demo6.php ');
>

demo8.php

<?php
  if (isset ($_cookie[' name ')) {
    echo ' welcome: '. $_cookie[' name '];
  } else {
    echo ' illegal login ';
  }
? >

demo9.php

<?php
  session_start ()//Account opening session processing
  //session as long as you use this, you must open the Session_Start ()
  //Put the file at the beginning
  //Create Session, directly using the Super global variable assignment can
  //session is the existence of the server side, generally stored for 1440 seconds,
  //If the Web page does not have any operation, will automatically destroy, of course, can be modified by php.ini to save time
  // If the browser is turned off, it is automatically destroyed as well.
  //timeliness, unlike cookies will slow half beat
  $_session[' name1 ' = ' onestopweb ';
  $_session[' name2 '] = ' onestopweb ';
  echo $_session[' name '];
if (isset ($_session[' name ')) {
//   echo $_session[' name '];
}else{
//   echo ' does not exist for this person. ';
//
  not deleted method//
$_session[' name ' = ';
  True deletion method
  //unset ($_session[' name '));
if (isset ($_session[' name ')) {
//   echo $_session[' name '];
}else{
//   echo ' does not exist for this person. ';
}
?>

demo10.php

<?php
  session_start ();
  Destroy all sessions, destroy also slow half beat
  Session_destroy ();
  echo $_session[' name1 '];
  echo $_session[' name2 '];
  Cookies apply to member login, Shopping cart ah ...
  //Because he does not occupy server resources, so members are particularly many, shopping carts are particularly many, use cookies
  //session generally used for background management login, people less
  //security, a period of time does not operate automatically expired
?>

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I hope this article will help you with the PHP program design.