


Detailed explanation of php receiving form submission data example_PHP tutorial
There are several ways to submit form submission data in PHP. One is the post and get methods. Now I will give you PHP beginners a detailed introduction to how to use get and post to receive form submission data. Friends who need to know more can refer to it. .
PHP $_GET and $_POST variables are used to obtain information in the form, such as information entered by the user
PHP 4.1 (it seems) has canceled the direct reception of variables, and uses $_GET['variable name'] to receive variables passed from the link, and $_POST['variable name'] to receive variables submitted from the form. . There are also $_FILES[], $_SERVER[], etc.
The following is an HTML file. This HTML contains an HTML form (HTML Form), which is mainly used to allow users to enter user names.
The code is as follows | Copy code | ||||
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The HTML display interface is as follows:
When you enter your name in the form text box input box of this HTML file, such as "Jacky", and then click the ok button, it will jump to get.php, and the following picture will be displayed in get.php.
代码如下 | 复制代码 |
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代码如下 | 复制代码 |
For example, "username" is the name value of the form control text input box,
代码如下 | 复制代码 |
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The code is as follows | Copy code |
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The code is as follows | Copy code |
$_POST Get HTML form submission data
代码如下 | 复制代码 |
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The code is as follows | Copy code |
When you enter a name in the text box input box of this HTML Form, such as "Jacky", and then click the ok button with the mouse, it will jump to post.php, and the output result displayed is You are Jacky. The source code of post.php is as follows:
代码如下 | 复制代码 |
You are . |
Get the form control's name value to get the form control's data.
For example, "username" is the name value of the form control text input box,
The code is as follows
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Copy code
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Use $_POST["username"] to get the data of the text input box.
$_REQUEST variable |

PHPsessionscanstorestrings,numbers,arrays,andobjects.1.Strings:textdatalikeusernames.2.Numbers:integersorfloatsforcounters.3.Arrays:listslikeshoppingcarts.4.Objects:complexstructuresthatareserialized.

TostartaPHPsession,usesession_start()atthescript'sbeginning.1)Placeitbeforeanyoutputtosetthesessioncookie.2)Usesessionsforuserdatalikeloginstatusorshoppingcarts.3)RegeneratesessionIDstopreventfixationattacks.4)Considerusingadatabaseforsessionstoragei

Session regeneration refers to generating a new session ID and invalidating the old ID when the user performs sensitive operations in case of session fixed attacks. The implementation steps include: 1. Detect sensitive operations, 2. Generate new session ID, 3. Destroy old session ID, 4. Update user-side session information.

PHP sessions have a significant impact on application performance. Optimization methods include: 1. Use a database to store session data to improve response speed; 2. Reduce the use of session data and only store necessary information; 3. Use a non-blocking session processor to improve concurrency capabilities; 4. Adjust the session expiration time to balance user experience and server burden; 5. Use persistent sessions to reduce the number of data read and write times.

PHPsessionsareserver-side,whilecookiesareclient-side.1)Sessionsstoredataontheserver,aremoresecure,andhandlelargerdata.2)Cookiesstoredataontheclient,arelesssecure,andlimitedinsize.Usesessionsforsensitivedataandcookiesfornon-sensitive,client-sidedata.

PHPidentifiesauser'ssessionusingsessioncookiesandsessionIDs.1)Whensession_start()iscalled,PHPgeneratesauniquesessionIDstoredinacookienamedPHPSESSIDontheuser'sbrowser.2)ThisIDallowsPHPtoretrievesessiondatafromtheserver.

The security of PHP sessions can be achieved through the following measures: 1. Use session_regenerate_id() to regenerate the session ID when the user logs in or is an important operation. 2. Encrypt the transmission session ID through the HTTPS protocol. 3. Use session_save_path() to specify the secure directory to store session data and set permissions correctly.

PHPsessionfilesarestoredinthedirectoryspecifiedbysession.save_path,typically/tmponUnix-likesystemsorC:\Windows\TemponWindows.Tocustomizethis:1)Usesession_save_path()tosetacustomdirectory,ensuringit'swritable;2)Verifythecustomdirectoryexistsandiswrita


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