Richard Davey wrote:
Hi all,
Ok it's 2am, my brain has gone to mush and I am having trouble
figuring out an easy way to do this, can anyone shed some light?
Take a peek at the following code:
// START
<pre>
<?php
print_r($_POST);
$userparam = "test['sam'][]";
// How to check if $userparam exists in the $_POST array
// and get all the values from it?
// Obviously this won't work, but you get the idea:
if (isset($_POST[$userparam]))
{
echo 'yeah';
$values = $_POST[$userparam];
}
else
{
echo 'nah';
}
?>
</pre>
<form method="post">
<input type="checkbox" name="test['bob'][]" value="red">red<br>
<input type="checkbox" name="test['bob'][]" value="green">green<br>
<input type="checkbox" name="test['bob'][]" value="blue">blue<br>
<input type="checkbox" name="test['sam'][]" value="red2">red2<br>
<input type="checkbox" name="test['sam'][]" value="green2">green2<br>
<input type="checkbox" name="test['sam'][]" value="blue2">blue2<br>
<input type="submit">
</form>
// END
From the code above I'm trying to figure out how to tell if the
$userparam exists in the $_POST array. PHP automatically expands the
form element name into multi-dim arrays within $_POST, so a simple
'isset' as shown in the code above won't play because it's got a
totally useless array key passed to it.
I need a way to turn the string:
"test['sam'][]"
into something I can look into $_POST for.
Any ideas? The coffee boost is wearing off, but I want to get this
licked tonight :-\
Do you have control over what $userparam looks like? I'm not entirely
sure what you're after due to the [] on the end of it, but I'm going to
assume you want to know if any of the 'sam' checkboxes were ticked.
Maybe the following is a possibility...
$userparam = "test.sam";
// How to check if $userparam exists in the $_POST array
// and get all the values from it?
$idx = '[\''.implode('\'][\']', explode('.', $userparam)).'\']';
eval('$isset = isset($_POST'.$idx.');');
// Obviously this won't work, but you get the idea:
if ($isset)
{
echo 'yeah';
eval('$values = $_POST'.$idx.';');
}
else
{
echo 'nah';
}
Untested, and remember that eval is pure evil.
If you can't control $userparam and it has to look like you have it then
you're parsing of it is a little more involved, but still fairly simple.
What are you actually trying to do? Where will $userparam actually come
from? There is almost certainly a better way to do this, but without
knowing all the details I'd be peeing in the wind.
-Stut
--
http://stut.net/
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