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Names of URL Parameters

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  Names of URL Parameters "eBob.com" <eBob.com@totallybogus.com> - 2011-09-21 16:56 -0400
    Re: Names of URL Parameters The Natural Philosopher <tnp@invalid.invalid> - 2011-09-21 22:06 +0100
    Re: Names of URL Parameters Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-09-21 23:46 +0200
      Re: Names of URL Parameters "eBob.com" <eBob.com@totallybogus.com> - 2011-09-21 23:27 -0400
        Re: Names of URL Parameters "Peter H. Coffin" <hellsop@ninehells.com> - 2011-09-22 07:43 -0500
        Re: Names of URL Parameters Richard Damon <news.x.richarddamon@xoxy.net> - 2011-09-22 13:36 -0400
    Re: Names of URL Parameters tamouse <tamouse.lists@gmail.com> - 2011-09-28 11:46 -0700
      Re: Names of URL Parameters tamouse <tamouse.lists@gmail.com> - 2011-09-28 12:18 -0700
      Re: Names of URL Parameters sheldonlg <sheldonlg@thevillages.net> - 2011-09-29 09:15 -0400

#3188 — Names of URL Parameters

I know that I can get and print the value of a URL parameter this way ...

echo '<p>phone: ' . $_GET['phone'] . '</p>';

... and that works fine of course.  But what if I don't know the names of 
all the parameters and just want to print out the names and values of all 
the parameters?  (It might not seem to make a lot of sense, but it would be 
useful to me in experimenting/developing/debugging.)

It looks like (I haven't tried it) $_SERVER['QUERY_STRING'] would give me 
the entire URL but I'd really rather not have to parse it.

Thanks,  Bob  (a very new noob) 

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#3189

eBob.com wrote:
> I know that I can get and print the value of a URL parameter this way ...
> 
> echo '<p>phone: ' . $_GET['phone'] . '</p>';
> 
> ... and that works fine of course.  But what if I don't know the names 
> of all the parameters and just want to print out the names and values of 
> all the parameters?  (It might not seem to make a lot of sense, but it 
> would be useful to me in experimenting/developing/debugging.)
> 
> It looks like (I haven't tried it) $_SERVER['QUERY_STRING'] would give 
> me the entire URL but I'd really rather not have to parse it.
> 
> Thanks,  Bob  (a very new noob)

$_GET[] is an array

Look at the manual on how to print a whole array.

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#3190

eBob.com wrote:
^^^^^^^^
You really want to put a real name there.  I usually don't talk to domains.

> I know that I can get and print the value of a URL parameter this way ...
> 
> echo '<p>phone: ' . $_GET['phone'] . '</p>';
> 
> ... and that works fine of course.  But what if I don't know the names of
> all the parameters and just want to print out the names and values of all
> the parameters?  (It might not seem to make a lot of sense, but it would
> be useful to me in experimenting/developing/debugging.)
> 
> It looks like (I haven't tried it) $_SERVER['QUERY_STRING'] would give me
> the entire URL but I'd really rather not have to parse it.

Think about it: Why does $_GET['phone'] work in the first place?

> Thanks,  Bob  (a very new noob)
                   ^^^^^^^^^^^^^
Don't.

<http://catb.org/~esr/faqs/smart-questions.html#id478703>


PointedEars
-- 
Use any version of Microsoft Frontpage to create your site.
(This won't prevent people from viewing your source, but no one
will want to steal it.)
  -- from <http://www.vortex-webdesign.com/help/hidesource.htm> (404-comp.)

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#3191

Yes, of course.  Thank you PointedEars and Natural Philosopher.  Although I 
have done a lot of programming in many different languages, I am brand new 
to PHP, and this was my first experience of any kind with arrays.  It just 
wasn't clicking that 'phone' (in my example) was a subscript.  I don't think 
I've used a language before in which plain ol' arrays can have character 
string "subscripts".

Thanks again for the help.

Bob


"Thomas 'PointedEars' Lahn" <PointedEars@web.de> wrote in message 
news:1888520.Oct5B3EuLq@PointedEars.de...
> eBob.com wrote:
> ^^^^^^^^
> You really want to put a real name there.  I usually don't talk to 
> domains.
>
>> I know that I can get and print the value of a URL parameter this way ...
>>
>> echo '<p>phone: ' . $_GET['phone'] . '</p>';
>>
>> ... and that works fine of course.  But what if I don't know the names of
>> all the parameters and just want to print out the names and values of all
>> the parameters?  (It might not seem to make a lot of sense, but it would
>> be useful to me in experimenting/developing/debugging.)
>>
>> It looks like (I haven't tried it) $_SERVER['QUERY_STRING'] would give me
>> the entire URL but I'd really rather not have to parse it.
>
> Think about it: Why does $_GET['phone'] work in the first place?
>
>> Thanks,  Bob  (a very new noob)
>                   ^^^^^^^^^^^^^
> Don't.
>
> <http://catb.org/~esr/faqs/smart-questions.html#id478703>
>
>
> PointedEars
> -- 
> Use any version of Microsoft Frontpage to create your site.
> (This won't prevent people from viewing your source, but no one
> will want to steal it.)
>  -- from <http://www.vortex-webdesign.com/help/hidesource.htm> (404-comp.) 

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#3192

On Wed, 21 Sep 2011 23:27:18 -0400, eBob.com wrote:

> Yes, of course. Thank you PointedEars and Natural Philosopher.
> Although I have done a lot of programming in many different languages,
> I am brand new to PHP, and this was my first experience of any kind
> with arrays. It just wasn't clicking that 'phone' (in my example) was
> a subscript. I don't think I've used a language before in which plain
> ol' arrays can have character string "subscripts".

Other languages probably just called them "hashes" instead. The
difference is largely semantics, in either direction.

-- 
Every fleeting thought you've ever had in your life, no matter how 
bizarre, is someone's lifelong obsession.  And he has a website.
              -- Skif's Internet Theorem

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#3193

On 9/21/11 11:27 PM, eBob.com wrote:
> Yes, of course. Thank you PointedEars and Natural Philosopher. Although
> I have done a lot of programming in many different languages, I am brand
> new to PHP, and this was my first experience of any kind with arrays. It
> just wasn't clicking that 'phone' (in my example) was a subscript. I
> don't think I've used a language before in which plain ol' arrays can
> have character string "subscripts".
>
> Thanks again for the help.
>
> Bob
>
>

Actually, those aren't "plain ol' arrays" but associative arrays, which 
just happen to use the same syntax as the simple linear array.

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#3226

Since the question seems directed to debugging, you should know about two functions: print_r and var_dump:

http://us2.php.net/manual/en/function.print-r.php
http://us2.php.net/manual/en/function.var-dump.php

In both of these cases, the standard behaviour is to dump the variable structure straight to the standard output (most likely your browser window/tab). This can be problematic for a few reasons, and can be a security risk if you're not careful.

print_r has a second paramter, which if set to TRUE, will return it's output as a string, which you can sanitize before sending to output thus:

echo "<pre>" . htmlentities(print_r($var,TRUE)) . "</pre>" . PHP_EOL;

This sort of thing will prove invaluable in debugging php code for the newbie. 

If you're doing a fair bit of this, you might want to set up a function for debugging, and use a global to turn on/off debugging. Lots of these exist already, some very sophisticated, some very simple.

Extremely simple:

function dbg($var)
{
    if ($GLOBALS['DEBUG'])
    {
        echo "<pre>".print_r($var,TRUE)."</pre>".PHP_EOL;
    }
}

And you can set $GLOBALS['DEBUG'] in a number of ways, such as in a common configuration file that is included in your application, or by introducing a DEBUG parameter in the $_REQUEST hash.

Some people (*cough*) go so far as to write a debugger class with all sorts of fancy bells and whistles, such as including the file, function, and line number where the debugging call is made, among others.

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#3227

On Wednesday, September 28, 2011 1:46:39 PM UTC-5, tamouse wrote:

> function dbg($var)
> {
>     if ($GLOBALS['DEBUG'])
>     {
>         echo "<pre> ".print_r($var,TRUE)."</pre>".PHP_EOL;
>     }
> }

Woops. that echo line should read:

        echo "<pre> ".htmlentities(print_r($var,TRUE))."</pre>".PHP_EOL;

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#3234

On 9/28/2011 2:46 PM, tamouse wrote:
> Since the question seems directed to debugging, you should know about two functions: print_r and var_dump:
>
> http://us2.php.net/manual/en/function.print-r.php
> http://us2.php.net/manual/en/function.var-dump.php
>
> In both of these cases, the standard behaviour is to dump the variable structure straight to the standard output (most likely your browser window/tab). This can be problematic for a few reasons, and can be a security risk if you're not careful.
>
> print_r has a second paramter, which if set to TRUE, will return it's output as a string, which you can sanitize before sending to output thus:
>
> echo "<pre>" . htmlentities(print_r($var,TRUE)) ."</pre>" . PHP_EOL;
>
> This sort of thing will prove invaluable in debugging php code for the newbie.
>
> If you're doing a fair bit of this, you might want to set up a function for debugging, and use a global to turn on/off debugging. Lots of these exist already, some very sophisticated, some very simple.
>
> Extremely simple:
>
> function dbg($var)
> {
>      if ($GLOBALS['DEBUG'])
>      {
>          echo "<pre>".print_r($var,TRUE)."</pre>".PHP_EOL;
>      }
> }
>
> And you can set $GLOBALS['DEBUG'] in a number of ways, such as in a common configuration file that is included in your application, or by introducing a DEBUG parameter in the $_REQUEST hash.
>
> Some people (*cough*) go so far as to write a debugger class with all sorts of fancy bells and whistles, such as including the file, function, and line number where the debugging call is made, among others.

I would use $_SESSION['DEBUG'] instead.

-- 
Shelly

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