PHP POST not working

Question

<?php echo $_POST['ss'];?>
<form action="<?php echo $_SERVER['PHP_SELF'];?>" method="post">
<input name="ss" type="text" />
<input type="submit" name="submit">
</form>

This code should print whatever is enter in text box name="ss" when click submit.
But its not printing. Working with method="get" but not with post, What's the problem.

Why are you using `$_SERVER['PHP_SELF']`, when you could leave the action attribute empty if you want it to submit to itself? — Shef, Mar 28 '12 at 20:17
i would guess the php_self tag is mucking things up and forcing a 302 — Rooster, Mar 28 '12 at 20:18
Wasim, are you getting any errors? If not, try adding `ini_set('display_errors',1); error_reporting(E_ALL);` This will let you see if anything else is stopping your success. — AlexC, Mar 28 '12 at 20:23
If the form is in the follow page: mywebsite.com/folder/subfolder, after submit the user go to root folder, with action="/" — Gabriel Santos, Mar 28 '12 at 20:25
not error showing, i have action="/" its even not working, i have told you that method="get" is working for $_GET but method="post" is not working for $_POST — Wasim A., Mar 28 '12 at 20:27
it solve my problem by changing php_max_size = 8M in php.ini — Wasim A., Mar 28 '12 at 20:31
In my case the form data was too large for PHP to handle https://stackoverflow.com/questions/2133652/how-to-gracefully-handle-files-that-exceed-phps-post-max-size — Matthew Lock, Mar 26 '20 at 01:04
Also see: https://stackoverflow.com/questions/9002424/php-post-not-working/17375026# — geoidesic, Oct 15 '22 at 11:22

Matthew Blancarte · Accepted Answer · 2012-03-28T20:41:21.910

16

If you're just refreshing the page, do:

action=''

instead of:

action="<?php echo $_SERVER['PHP_SELF'];?>"

Also, add this to line 2 to see what's being stored (if anything) in the $_POST array:

var_dump( $_POST );

Hmm... so it's empty on submit? Try adding this to the top of your php file:

if(empty($_SERVER['CONTENT_TYPE']))
{ 
  $_SERVER['CONTENT_TYPE'] = "application/x-www-form-urlencoded"; 
}

Okay, now check your php.ini (normally requires sudo or root in /etc):

post_max_size = 8M
variables_order = "EGPCS"

Do you have those two rules set? If so, be careful of how much memory you're allocating. Anything over 2048MB could start to give you trouble, depending on your system specs.

NOTE: If you make changes to your php.ini file and PHP is running as an apache module, you'll need to restart apache. Something along the lines of:

sudo /etc/init.d/httpd restart

edited Mar 28 '12 at 20:41

answered Mar 28 '12 at 20:17

Matthew Blancarte

8,251
2
25
34

What does the var_dump say? array(0)? – Matthew Blancarte Mar 28 '12 at 20:20
i did print_r($_POST), when first time page load its say Array() but when i submit, nothing in array. – Wasim A. Mar 28 '12 at 20:20
3

Its not working answer is useless. Var dump as matthew has said and tell us the results. – itachi Mar 28 '12 at 20:22
Hmmm... Okay. Did you set up php yourself? Check my edited answer. – Matthew Blancarte Mar 28 '12 at 20:22
name="ss" is the key to textbox – Wasim A. Mar 28 '12 at 20:27
Right. I think itachi is rightfully surprised that the $_POST array is empty. – Matthew Blancarte Mar 28 '12 at 20:29
let me check php_max_size, i have change it to upload file with more than 8MB, but what if i want to upload file with greater size. it will cause another problem – Wasim A. Mar 28 '12 at 20:29
You can set the memory limit to whatever you feel comfortable with. I was just wondering if it wasn't in your php.ini at all, or if it was set to 0. :) – Matthew Blancarte Mar 28 '12 at 20:30
yes you was correct resetting php_max_size correct my problem but raise another problem, how will i upload files with more than 8MB now – Wasim A. Mar 28 '12 at 20:30
1

@Wasim Change to more then 8MB. – Gabriel Santos Mar 28 '12 at 20:32
What was your previous setting? You should set it to whatever you feel your server can handle! :D – Matthew Blancarte Mar 28 '12 at 20:32
i change it to 20000M for 20GB, so what's it mean, is there any limit to upload file via PHP – Wasim A. Mar 28 '12 at 20:33
Well crap, that is by far the largest upload limit I have seen run on PHP. Basically, you were probably running out of memory. $_POST uploads require THREE settings to work correctly. upload_max_filesize, post_max_size, memory_limit. – Matthew Blancarte Mar 28 '12 at 20:35
i have set every thing to 20000M but i believe there should be a limited size for post – Wasim A. Mar 28 '12 at 20:38
Just did some Googlin', and it looks like anything over 2GB limit can cause trouble. You may have a bigger fish to fry here! May I ask why you need a 20GB upload limit? – Matthew Blancarte Mar 28 '12 at 20:38

score 6 · Answer 2 · answered Nov 14 '13 at 08:39

6

I broken my post method once that I set post_max_size the same with upload_max_filesize.

I think that post_max_size must less than upload_max_filesize.
Tested with PHP 5.3.3 in RHEL 6.0

answered Nov 14 '13 at 08:39

zx1986

880
2
12
18

1

glad I could help :-D – zx1986 Mar 28 '14 at 09:33

score 6 · Answer 3 · answered Dec 04 '14 at 12:38

6

It may be due to rewrite rules in the .htaccess file.Add this condition to your .htaccess file

RewriteCond %{REQUEST_METHOD} !POST [NC]

OR add this line

 RewriteRule ^welcome_post.php - [PT]

answered Dec 04 '14 at 12:38

Nidhin

1,818
22
23

2

Thank you so much! I ran into this problem, and your first rewrite condition fixed it perfectly! Saved me hours of pain :) – julianwyz Feb 17 '15 at 21:23

score 1 · Answer 4 · answered Nov 22 '19 at 12:38

Finally ...Got it.... Firstly I have an Article folder in my htdocs file with welcome.php as the php file in focus and a main HTML file , whose contents we will be discussing about. Here's what worked for me.. Turns out the problem was not XAMPP or any of its related files.. The problem was this :

<form action="welcome.php" method="post">

With this code whenever I pressed the submit button, the url redirects to here file:///C:/xampp/htdocs/Article/welcome.php, Which is not what it needs to be..It has to be a localhost link ..So I changed the value of action attribute to localhost form and now it looks like this

<form action="https://localhost/Article/welcome.php" method="post">

That did the trick..Now the submit button redirects to https://localhost/Article/welcome.php , this link..Which is exactly what is needed.. Remember the browser may ask you for some permission issues ..Just accept them it will run fine... Best of luck.. P.S : This one is for Windows..Hope it will work also in Linux and Mac.

score 0 · Answer 5 · answered May 08 '15 at 19:47

0

My friend ran into this problem today. The answer was pretty simple - basically, you have to capitalize the POST part of method="POST"

The final result should look like

<?php echo $_POST['ss'];?>
<form action="<?php echo $_SERVER['PHP_SELF'];?>" method="POST">
<input name="ss" type="text" />
<input type="submit" name="submit">
</form>

answered May 08 '15 at 19:47

mjkaufer

4,047
5
27
55

2

this can't be it... see http://www.w3schools.com/php/showphp.asp?filename=demo_form_post – m13r Sep 15 '16 at 08:05
4

Not true. [Enumerated attributes (like `method`) are case-insensitive](https://www.w3.org/TR/html5/infrastructure.html#enumerated-attribute). – Quentin Jul 31 '17 at 10:02

zeeawan · Answer 6 · 2017-08-02T05:39:02.763

0

First make sure that your web service (GET/POST etc) is acting as desired using the Chrome Advanced Rest Client. Then you should check your PHP part.

edited Aug 02 '17 at 05:39

answered Nov 18 '15 at 06:48

zeeawan

6,667
2
50
56

score 0 · Answer 7 · answered Aug 30 '18 at 20:55

0

I solved mine with including following into header.

Content-Type: application/x-www-form-urlencoded

Just use this in the header while making a request and my problem was solved.

answered Aug 30 '18 at 20:55

Kranthi Kumar

1

JWC May · Answer 8 · 2017-08-01T05:57:33.543

-1

<form action="" method="post"> method="post" is important for POST Data.

Use PHP REQUEST instead:

<form action="" method="post">
  <input type="email" name="mail">
  <input type="submit" name="submit" value="Submit">
</form>
PHP:

if(isset($_REQUEST['submit'])){
  $val= $_REQUEST['mail'];
  echo $val;
}

edited Aug 01 '17 at 05:57

answered Jul 31 '17 at 09:49

JWC May

605
8
14

"Never forget to give POST Method in html form attribute" — They didn't. You can clearly see it in the code in the question. – Quentin Jul 31 '17 at 10:00
The method="post" will not work if the Old Cache is stored in the Web Browser. To become method="post" active, the Client must verify that POST Method is working within the Cache Storage. – JWC May Aug 01 '17 at 05:55

score -2 · Answer 9 · answered May 08 '15 at 05:46

-2

use this instead;

$variable_name = $_REQUEST["ss"];
echo $variable_name;

answered May 08 '15 at 05:46

Shema_Thomas

89
1
2

score -2 · Answer 10 · answered Dec 17 '16 at 11:28

change your IDE ,i use phpstorm ,it's fantastic but when i use dreamweaver it works probably, for test you can run your page directly from wampserver localhost , i change default port of apache and i think problem is from there , if you use phpstorm or change port of apache server change your IDE.

PHP POST not working

10 Answers10

Linked

Related