Simple examples and instructions for uploading files with PHP
Upload filesExample
First build a form <code><span>html</span>><span>body</span>><span>form</span><span>action</span>=<span>"upload.php"</span><span>method</span>=<span>"post"</span><span>enctype</span>=<span>"multipart/form-data"</span>><span>input</span><span>type</span>=<span>"file"</span><span>name</span>=<span>"file"</span>/><span>input</span><span>type</span>=<span>"submit"</span><span>value</span>=<span>"submit"</span><span>name</span>=<span>"submit"</span>><span><span>form</span>></span><span><span>body</span>></span><span><span>html</span>></span></code>
that can
. In the form, after submission, it will be handed over to upload.php
for processing. Let’s write the simplest upload handler:
<code><span><?php </span> var_dump(<span>$_POST</span>); var_dump(<span>$_FILES</span>); <span>$uploadPath</span> = <span>'./upload/'</span>; <span>$tempFileName</span> = <span>$_FILES</span>[<span>'file'</span>][<span>'tmp_name'</span>]; <span>$uploadFileName</span> = <span>$uploadPath</span>.<span>$_FILES</span>[<span>'file'</span>][<span>'name'</span>]; <span>if</span>(move_uploaded_file(<span>$tempFileName</span>,<span>$uploadFileName</span>)){ <span>echo</span><span>'upload success'</span>; }<span>else</span>{ <span>echo</span><span>'upload fail'</span>; }</span></code>
Visit the submission page and submit the form. You can see the following output:
<code><span>array</span> (size=<span>1</span>) <span>'submit'</span> => string <span>'submit'</span> (length=<span>6</span>) <span>array</span> (size=<span>1</span>) <span>'file'</span> => <span>array</span> (size=<span>5</span>) <span>'name'</span> => string <span>'laravel-quickstart-welcome.png'</span> (length=<span>30</span>) <span>'type'</span> => string <span>'image/png'</span> (length=<span>9</span>) <span>'tmp_name'</span> => string <span>'/tmp/phpYKQKaY'</span> (length=<span>14</span>) <span>'error'</span> => int <span>0</span><span>'size'</span> => int <span>91148</span> upload success</code>
The output illustrates two points: The content submitted by the input type=file will appear in the
$_FILES- array. Use input's
- name
field as its
indexin the
$_FILESarray. The content submitted by input with
type=file will continue to appear in the $_POST array. The structure of the array corresponding to each file in the
- The file name of the uploaded file
type
- The type of the uploaded file
tmp_name
PHP - After uploading the file
, it will be stored in the temporary directory first. tmp_name displays the path of the temporary file
error to store the error code -
size
- The size of the uploaded file
, in bytes
So PHP The idea of uploading files
$_FILES array. You can verify the file as needed (such as the suffix name), and then use the move_uploaded_file function to copy the temporary file Go to your upload directory. Notes
from form must set the
enctype="multipart/form-data"- attribute, otherwise it cannot be uploaded
-
The folder in the upload path must exist, otherwise an error will be reported
<code>failed to open stream: No such file or directory </code>
If necessary, you can use
If the file corresponding to the path of the second parameter of
move_uploaded_file
Reference: PHP file upload
- PHP: move_uploaded_file - Manual
- ').addClass('pre-numbering').hide(); $(this).addClass('has-numbering').parent().append($numbering); for (i = 1; i ').text(i)); }; $numbering.fadeIn(1700); }); });

PHPsessionstrackuserdataacrossmultiplepagerequestsusingauniqueIDstoredinacookie.Here'showtomanagethemeffectively:1)Startasessionwithsession_start()andstoredatain$_SESSION.2)RegeneratethesessionIDafterloginwithsession_regenerate_id(true)topreventsessi

In PHP, iterating through session data can be achieved through the following steps: 1. Start the session using session_start(). 2. Iterate through foreach loop through all key-value pairs in the $_SESSION array. 3. When processing complex data structures, use is_array() or is_object() functions and use print_r() to output detailed information. 4. When optimizing traversal, paging can be used to avoid processing large amounts of data at one time. This will help you manage and use PHP session data more efficiently in your actual project.

The session realizes user authentication through the server-side state management mechanism. 1) Session creation and generation of unique IDs, 2) IDs are passed through cookies, 3) Server stores and accesses session data through IDs, 4) User authentication and status management are realized, improving application security and user experience.

Tostoreauser'snameinaPHPsession,startthesessionwithsession_start(),thenassignthenameto$_SESSION['username'].1)Usesession_start()toinitializethesession.2)Assigntheuser'snameto$_SESSION['username'].Thisallowsyoutoaccessthenameacrossmultiplepages,enhanc

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.


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