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English
In PHP development, form submission is a very common operation, especially in scenarios such as user login, registration, and data entry. Closely related to form processing is the management of session. PHP provides some functions to control the state of session, where session_abort() is a relatively less common but very practical function. This article will explore the specific role and application scenarios of session_abort() around typical applications after PHP form submission.
session_abort() is used to discard changes made to session in the current script and restore it to the state when session_start() is performed. In other words, it will revoke all modifications to the session data in this request, will not write the changes back to the session storage, and will close the session write lock.
It is opposite to session_write_close() , which saves the modification and closes the session.
Typically, form submission processing involves reading and writing session data, such as storing user identity, operation status, etc. By default, PHP will automatically write back data at the end of script execution as long as there is a modification to the session.
However, in some cases we do not want to save modifications, such as:
When an error occurs in the form submission, undo the session modification to avoid contaminating the data;
Just want to read the session to avoid write lock blocking other requests;
In a multi-request environment, reduce the holding time of session write locks and improve performance.
Sometimes after the form is submitted, the program will save temporary information in the session (such as the error message for form verification). If the final verification fails and you want to give up the temporary data update in this session, you can call session_abort() to avoid polluting the session data.
<?php
session_start();
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$_SESSION['temp_data'] = $_POST['some_field'];
// Form verification logic
if (empty($_POST['some_field'])) {
// Verification failed，Revoke session Change
session_abort();
echo "Submission failed，Field cannot be empty。";
exit;
}
// Verification is successful，session 中的Change会自动保存
echo "Submission successful！";
}
?>
In a high concurrency environment, if a request only needs to read session data and does not modify it, it can avoid holding a write lock, and quickly release the lock through session_abort() to improve overall performance.
<?php
session_start();
// Read only session，No modification
$user_id = $_SESSION['user_id'] ?? null;
// Give up the modification immediately（Even if there is no change），Release the lock
session_abort();
// Subsequent logic execution，Improve concurrency efficiency
echo "Current userID：" . htmlspecialchars($user_id);
?>
For example, in a multi-step form submission, the first step is to read the session to record the user status, and the second step is to decide whether to save the changes based on certain conditions, otherwise the session_abort() is called.
<?php
session_start();
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$_SESSION['step1'] = $_POST['field1'];
if ($_POST['field1'] === 'cancel') {
// User Select Cancel，Revoke所有Change
session_abort();
echo "Operation cancelled，未保存Change。";
exit;
}
// 继续保存Change，Execute subsequent logic
echo "The first step is saved。";
}
?>
The typical application scenario of session_abort() after PHP form submission is mainly used for:
Revoke changes to session in this request to avoid incorrect or unnecessary data writebacks;
Release session write lock to improve concurrency performance;
Supports complex multi-step form process control.
Understanding and rational use of session_abort() can make PHP session management more flexible and efficient, especially suitable for application scenarios that are sensitive to session data and have a large amount of concurrent access.
A sample URL domain name in the sample code:
<?php
// Sample request address
$url = "https://gitbox.net/api/submit";
?>
