Re: test prog inpu tpost

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From	"J.O. Aho" <user@example.net>
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Subject	Re: test prog inpu tpost
Date	Fri, 1 Jan 2016 09:40:44 +0100
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On 01/01/2016 03:22 AM, Lew Pitcher wrote:
> On Thursday December 31 2015 20:57, in
> comp.lang.php, "vjp2.at@at.BioStrategist.dot.dot.com"
> <vjp2.at@at.BioStrategist.dot.dot.com> wrote:
> 
>>
>> Should this work?
> 
>> I'm stuck with lynx browser for a few days and can't tell 
> 
> That shouldn't stop you, assuming that you have a PHP-enabled webserver to
> host the page on.
> 
> Lynx, like all browsers, just renders the html sent to it by the server.
> 
> PHP code executes on the server.
> 
> If the html with PHP is served from a PHP-enabled web server, lynx will render
> the results correctly.
>  
>> <html>
>> <head>
>> <title>Quadratic</title>
>> </head>
>> <body>
>> <?php
>>   $t;
> 
> What is $t ?
> Why are you trying to execute it as a php statement?

I think the OP is trying to initiate the variable before use, so to not
get errors with uninitiated variables, but will instead generate the
error as they are uninitiated.

>>   $b=$_POST['b'];$a=$_POST['a'];$c=$_POST['c'];
> 
> Here, you should test whether the page is invoked from a GET or a POST. None
> of the $_POST variables will be set on the initial GET, and your later
> computation will be invalid.

If allowing both, you could use $_REQUEST, but you should avoid to use
that, as it makes it easier to do unintended things.

Should always validate that you have got what you wanted in a request,
so should use for example is_numeric() to verify that the value is not
something else and stop the processing already here if it's invalid data.

>
>>   if($t<=0)
>>     $t=(-1)*$t;
>>   $x=(-2*$c)/($b+(sqrt($t)));
>>   $y=(-2*$c)/($b-(sqrt($t)));
>>   echo sprintf("Solution in Addition = %f  in Subtraction = %f" ,$x,$y);
> 
> This last stmt is overly complicated. Why wouldn't you just
>   printf("Solution in Addition = %f  in Subtraction = %f" ,$x,$y);
> ?

PHP allows you to use a lot of different ways, for example

echo "Solution in Addition = {$x}  in Subtraction = {$y}";

would work in this case too.

>> ?>
>> <form method="post">
>> <label>What is a? <input type="number" name="a"></label><br>
>> <label>What is b? <input type="number" name="b"></label><br>
>> <label>What is c? <input type="number" name="c"></label><br>
> 
> I'm not entirely certain that this is the proper use for the <label> element. 

No it's malformed, the label should have been closed before the input,
for those who want to know a little bit more of the use can head to
http://www.w3schools.com/tags/tag_label.asp

-- 

 //Aho

Thread

test prog inpu tpost vjp2.at@at.BioStrategist.dot.dot.com - 2016-01-01 01:57 +0000
  Re: test prog inpu tpost Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-12-31 21:22 -0500
    Re: test prog inpu tpost Matthew Carter <m@ahungry.com> - 2015-12-31 21:40 -0500
    Re: test prog inpu tpost "J.O. Aho" <user@example.net> - 2016-01-01 09:40 +0100
    Re: test prog inpu tpost Jerry Stuckle <jstucklex@attglobal.net> - 2016-01-01 09:32 -0500
      Re: test prog inpu tpost Arno Welzel <usenet@arnowelzel.de> - 2016-01-01 18:24 +0100
        Re: test prog inpu tpost Jerry Stuckle <jstucklex@attglobal.net> - 2016-01-01 14:07 -0500
          Re: test prog inpu tpost Matthew Carter <m@ahungry.com> - 2016-01-01 21:40 -0500
            Re: test prog inpu tpost Jerry Stuckle <jstucklex@attglobal.net> - 2016-01-01 21:53 -0500
            Re: test prog inpu tpost Arno Welzel <usenet@arnowelzel.de> - 2016-01-02 11:39 +0100
            Re: test prog inpu tpost Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-01-02 22:43 +0100
  Re: test prog inpu tpost Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-12-31 21:39 -0500
  Re: test prog inpu tpost vjp2.at@at.BioStrategist.dot.dot.com - 2016-01-07 03:19 +0000

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