session_abort()

(PHP 5 >= 5.6.0, PHP 7)

中断会话阵列更改并完成会话

说明

session_abort(void): bool

session_abort()完成会话而不保存数据。因此，会话数据中的原始值得以保留。

返回值

成功时返回TRUE，或者在失败时返回FALSE。

更新日志

参见

• $_SESSION
• Thesession.auto_startconfiguration directive
• session_start()启动新会话或者重用现有会话
• session_reset()Re-initialize session array with original values
• session_commit()session_write_close 的别名

To better understand this function you should execute this code first :
<?php
  // First of all choose your path , For e.g. C:/session
  session_save_path('Your Path here !');
  
  session_start();
  
  // Define a Session Variable
  $_SESSION['Key'] = 'value' ;
  
  Var_dump(session_status() == PHP_SESSION_ACTIVE);
  
  // Output : bool(True) , it means you have an open session !
?>
Then you should execute this code :
<?php
  // Choose the path that you used it in first part 
  session_save_path('Your path here');
  
  session_start();
  
  // If you want to close session and keep your original data in your path , you should use session_abort()
  session_abort();
  
  var_dump(session_status()== PHP_SESSION_ACTIVE);
  
  // Output : bool(False) , it means your session closed .
?>
So if you have an open session , session_abort() will simply close it without effecting the external session data , so you can reload your data again from your path that you chose .

session_abort()  closes the current session and discards the changes applied to Session array in the current page  , it doesn't delete the session file 
let me explain with one example. 
page 1.php :
<?php
session_start();
$_SESSION['city']="Sydney";
echo "<a href=\"2.php\"> page2</a>";
?>
when you open this page , a session file is created on the server (to find out where session files are saved run "echo session_save_path()" )  with the name of session_id  and the content of  the variable :
  sess_o22iabs75j93uhc7i4jf1lecjk  (file name)
 city|s:6:"Sydney";               (content)
if we go to 2.php containing this code :
<?php
session_start();
$_SESSION['country']="Australia";
echo session_encode();
session_abort();
session_start();
echo "<br>".session_encode();
?>
when session_abort is executed , the session is closed and the change which here is the 'country' element of Session array is discarded . 
Output : 
city|s:6:"Sydney";country|s:9:"Australia";
city|s:6:"Sydney";

<?php
session_start();
if(!isset($_SESSION['count'])){
  $_SESSION['count'] = 1;
}else{
  $_SESSION['count']++;
  session_abort();
}
echo $_SESSION['count'];
//$_SESSION['count'] will always be 1;
//This will always echo 1 not the above code.
?>

demo1
<?php
session_start();
if(!isset($_SESSION['count'])){
  $_SESSION['count'] = 1;
}else{
  $_SESSION['count']++;
}
echo $_SESSION['count'];
//above, $_SESSION['count'] will keep increase;
?>
demo2
<?php
session_start();
if(!isset($_SESSION['count'])){
  $_SESSION['count'] = 1;
}else{
  $_SESSION['count']++;
}
session_abort();
echo $_SESSION['count'];
//$_SESSION['count'] will always be 1;
?>