php $_POST variable variables

Question

I am trying to populate an HTML form with values from a previous form being posted. The first form is created dynamically and is a list of t-shirt styles with 5 different sizes available.

I'm having trouble figuring out a way to populate the second form.

The HTML is this:

echo '<input name="'.$filename.'-s" type="text" size="3" value="'.$quantity.'"'>;

What I'd like to do for $quantity is something like this:

$quantity = $_POST['{$filename.$size}'];

Is it possible to use a variable with $_POST?

Why shouldn't it be possible? You don't even need quotes, just do: $_POST[$filename . $size] and try it — Rizier123
– Rizier123, Commented Jul 11, 2015 at 18:21
Single quoted strings are not parsed. Either use double quotes or no quotes as @Rizier123 advised — u_mulder
– u_mulder, Commented Jul 11, 2015 at 18:22
Please read this post, it is only a few days older than yours and the question is almost identical: stackoverflow.com/questions/31329499/… (edit, this may not be an exact duplicate, but does solve the issue of parsing unknown array keys into $_POST ) — Mm-Art-In
– Mm-Art-In, Commented Jul 11, 2015 at 18:52
@Rizier123 Thanks. I had tried that first and it didn't seem to work. Must have been something else. Got interrupted by a fire call in the middle of working on it and lost my place. So then I started trying all kinds of different variations. Got it working now. — MattKnowles
– MattKnowles, Commented Jul 11, 2015 at 19:02

mike.k · Accepted Answer · 2015-07-11 18:22:47Z

1

I think you're looking for this:

$quantity = htmlentities($_POST["$filename$size"]);

htmlentities() is necessary in case you have " or other junk in the input

answered Jul 11, 2015 at 18:22

mike.k

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Mm-Art-In Over a year ago

I would add a small qualifier for the OP and recommend that htmlentities is used with as many of the variables filled in as possible, for example htmlentities($var, ENT_QUOTES, "UTF-8", FALSE); rather than relay on defaults.

MattKnowles · Accepted Answer · 2015-07-11 19:06:30Z

0

$_POST[$var1.$var2] worked. Nothing came up in my initial search of previous answers, although I see several applicable questions in the related questions on this page.

answered Jul 11, 2015 at 19:06

MattKnowles

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