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Beginner question on using PHP and POST

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  Beginner question on using PHP and POST Dan Wissme <wissme@free.fr> - 2019-08-24 18:14 +0200
    Re: Beginner question on using PHP and POST "R.Wieser" <address@not.available> - 2019-08-24 18:47 +0200
      Re: Beginner question on using PHP and POST "R.Wieser" <address@not.available> - 2019-08-24 18:53 +0200
    Re: Beginner question on using PHP and POST Martin Leese <please@see.Web.for.e-mail.INVALID> - 2019-08-24 12:35 -0600
      Re: Beginner question on using PHP and POST Martin Leese <please@see.Web.for.e-mail.INVALID> - 2019-08-24 13:04 -0600
    Re: Beginner question on using PHP and POST Jeroen Belleman <jeroen@nospam.please> - 2019-08-24 23:59 +0200
    Re: Beginner question on using PHP and POST Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-08-25 01:31 +0100
    Re: Beginner question on using PHP and POST Arno Welzel <usenet@arnowelzel.de> - 2019-08-26 09:27 +0200

#18041 — Beginner question on using PHP and POST

I write an HTML page foods.html containing a form like :

<form method="post" action="process.php">
     <p><input type="text" name="food" id="food"></p>
     <input type="submit" value="OK">
</form>


The purpose is to get from user the name of the food and open a web page 
already existing about that food. The user may ask for 'meat' for 
example. I will then open the web page meat.html

So I wrote a file "process.php" like that one :

<?php
$food=htmlspecialchars($_GET["food"]);
<--------- what then ?
?>

I tried echo, readfile, etc but got nothing...
Thanks,

     -dan

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#18042

Dan,

Two things:

> $food=htmlspecialchars($_GET["food"]);

You are POSTing, but are inspecting the $_GET array ?  No wonder you do not 
get anything (see what I did there ? :-) )

Suggestion: Try to inspect the $_POST array instead.

Some info: https://www.php.net/manual/en/reserved.variables.post.php

> I tried echo, readfile, etc but got nothing...

Correction, you did not /see/ anything.

Next time when you are not sure what, or even if you should see anything 
delimit the output with a few know characters.   My favorites are the square 
brackets:

echo "[". $food ."]"

Maybe throw in a carriage-return and linefeed for good measure too:

echo "[". $food ."]\r\n"

remark: Apologize for any errors or glaring omissions - I'm a PHP novice 
myself too. :-)

Regards,
Rudy Wieser

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#18043

Dan,

Also take a look at the $_REQUEST array (combination of GET, POST and COOKIE 
arrays):

http://www.shodor.org/~kevink/phpTutorial/nileshc_getreqpost.php

Regards,
Rudy Wieser

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#18044

Dan Wissme wrote:
...
> The purpose is to get from user the name of the food and open a web page 
> already existing about that food. The user may ask for 'meat' for 
> example. I will then open the web page meat.html

Perhaps I have misunderstood what it is you
are trying to do, but what is wrong with a
list of links?  The pages such as meat.html
already exist, so you know the list of links
to offer.

Something like:
<ul>
<li><a href="meat.html">Meat</a></li>
<li><a href="vegies.html">Vegies</a></li>
...
</ul>

Alternatively, put them in a <select> list.
Something like:
<form method="POST" action="...">
<p>
<select id="food">
<option value="meat.html">Meat</option>
<option value="vegies.html">Vegies</option>
...
</select>
<button type="button" onclick="displayPage();">Display page</button>
</p>
<form>

Writing the JavaScript function displayPage()
has been left as an exercise for Dan :-)

Neither approach comes anywhere near PHP; I
see no need for PHP.

-- 
Regards,
Martin Leese
E-mail: please@see.Web.for.e-mail.INVALID
Web: http://members.tripod.com/martin_leese/

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#18045

Martin Leese wrote:
...
> Writing the JavaScript function displayPage()
> has been left as an exercise for Dan :-)

Hi Dan,

I tried to e-mail you some (untested)
JavaScript to get you going, but the e-mail
bounced with the message:

550 5.2.1 This mailbox has been blocked due to inactivity (UserSearch)

If you would like the JavaScript code then
please e-mail me.
-- 
Regards,
Martin Leese
E-mail: please@see.Web.for.e-mail.INVALID
Web: http://members.tripod.com/martin_leese/

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#18046

On 2019-08-24 18:14, Dan Wissme wrote:
> I write an HTML page foods.html containing a form like :
>
> <form method="post" action="process.php">
>      <p><input type="text" name="food" id="food"></p>
>      <input type="submit" value="OK">
> </form>
>
>
> The purpose is to get from user the name of the food and open a web page
> already existing about that food. The user may ask for 'meat' for
> example. I will then open the web page meat.html
>
> So I wrote a file "process.php" like that one :
>
> <?php
> $food=htmlspecialchars($_GET["food"]);
> <--------- what then ?
> ?>
>
> I tried echo, readfile, etc but got nothing...
> Thanks,
>
>      -dan
>

If the form's method is 'POST' the variables are accessed
in PHP as $_POST["food"]. $_GET is used only when the method
is "get".

Jeroen Belleman

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#18047

Dan Wissme <wissme@free.fr> writes:

> I write an HTML page foods.html containing a form like :
>
> <form method="post" action="process.php">
>     <p><input type="text" name="food" id="food"></p>
>     <input type="submit" value="OK">
> </form>
>
>
> The purpose is to get from user the name of the food and open a web
> page already existing about that food. The user may ask for 'meat' for
> example. I will then open the web page meat.html
>
> So I wrote a file "process.php" like that one :
>
> <?php
> $food=htmlspecialchars($_GET["food"]);
> <--------- what then ?
> ?>

You don't need htmlspecialchars, but you should sanitise the input.  For
example, you could check that $_POST['food'] (or $_REQUEST['food'])
contains nothing but lowercase letters.

> I tried echo, readfile, etc but got nothing...

You could use PHP's header function like this:

  header("Location: $food.html");
  exit();

This cases the HTTP response to include a redirection header.  A
confirming browser will then request the HTML document in question.

-- 
Ben.

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#18048

Dan Wissme:

> I write an HTML page foods.html containing a form like :
> 
> <form method="post" action="process.php">
>      <p><input type="text" name="food" id="food"></p>
>      <input type="submit" value="OK">
> </form>
> 
> 
> The purpose is to get from user the name of the food and open a web page 
> already existing about that food. The user may ask for 'meat' for 
> example. I will then open the web page meat.html
> 
> So I wrote a file "process.php" like that one :
> 
> <?php
> $food=htmlspecialchars($_GET["food"]);
> <--------- what then ?
> ?>
> 
> I tried echo, readfile, etc but got nothing...

Because you POST things you need $_POST[].


-- 
Arno Welzel
https://arnowelzel.de

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