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
– Shef, Commented Mar 28, 2012 at 20:17
i would guess the php_self tag is mucking things up and forcing a 302 — Rooster
– Rooster, Commented Mar 28, 2012 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
– AlexC, Commented Mar 28, 2012 at 20:23

Matthew Blancarte · Accepted Answer · 2012-03-28 20:41:21Z

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, 2012 at 20:41

answered Mar 28, 2012 at 20:17

Matthew Blancarte

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15 Comments

Matthew Blancarte Over a year ago

What does the var_dump say? array(0)?

Wasim A. Over a year ago

i did print_r($_POST), when first time page load its say Array() but when i submit, nothing in array.

itachi Over a year ago

Its not working answer is useless. Var dump as matthew has said and tell us the results.

Matthew Blancarte Over a year ago

Hmmm... Okay. Did you set up php yourself? Check my edited answer.

Gabriel Santos Over a year ago

@Wasim Change to more then 8MB.

|

Nidhin · Accepted Answer · 2014-12-04 12:38:59Z

7

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 4, 2014 at 12:38

Nidhin

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1 Comment

julianwyz Over a year ago

Thank you so much! I ran into this problem, and your first rewrite condition fixed it perfectly! Saved me hours of pain :)

zx1986 · Accepted Answer · 2013-11-14 08:39:09Z

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, 2013 at 8:39

zx1986

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1 Comment

zx1986 Over a year ago

glad I could help :-D

Subham Debnath · Accepted Answer · 2019-11-22 12:38:31Z

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.

mjkaufer · Accepted Answer · 2015-05-08 19:47:53Z

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 8, 2015 at 19:47

mjkaufer

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2 Comments

m13r Over a year ago

this can't be it... see w3schools.com/php/showphp.asp?filename=demo_form_post

Quentin Over a year ago

Not true. Enumerated attributes (like method) are case-insensitive.

zeeawan · Accepted Answer · 2017-08-02 05:39:02Z

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 2, 2017 at 5:39

answered Nov 18, 2015 at 6:48

zeeawan

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Comments

JWC May · Accepted Answer · 2017-08-01 05:57:33Z

-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 1, 2017 at 5:57

answered Jul 31, 2017 at 9:49

JWC May

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2 Comments

Quentin Over a year ago

"Never forget to give POST Method in html form attribute" — They didn't. You can clearly see it in the code in the question.

JWC May Over a year ago

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.

Kranthi Kumar · Accepted Answer · 2018-08-30 20:55:10Z

-1

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, 2018 at 20:55

Kranthi Kumar

1

1 Comment

Quentin Feb 19 at 17:43

The browser will head that automatically given the code in the question. If it didn't, then there would be no way to add it.

Shema_Thomas · Accepted Answer · 2015-05-08 05:46:16Z

-2

use this instead;

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

answered May 8, 2015 at 5:46

Shema_Thomas

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Comments

samy · Accepted Answer · 2016-12-17 11:28:17Z

-2

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.

answered Dec 17, 2016 at 11:28

samy

1

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