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Concatenation not working to display in a textbox(textarea)

Posted on 2010-08-23
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Last Modified: 2012-05-10
hi,

i have an array that stores different id numbers (for example, 1, 7, 10, etc.) coming from selected items from several checkboxes ("DocID") in a previous php page.
i can use implode to print the whole array and it does ok, my problem is when i try to print the resulting id numbers concatenated with a string.
the string is "http://localhost/oge/detail.php?doc_id="

The resulting text should be (ammount of ids is variable):
http://localhost/oge/detail.php?doc_id=1
http://localhost/oge/detail.php?doc_id=7
http://localhost/oge/detail.php?doc_id=10

and this concatenation should be displayed to a text area.

See my code:
<?php

	if (isset($_POST['DocID'])) 
		{
			$ruta="http://localhost/dms/detail.php?doc_id=";
			$SelectedDocuments = implode("\n", $_POST['DocID']);
			
			foreach ($SelectedDocuments as $key=>$value)
				{
					print("<td><textarea name='detail' cols='50' rows='4' id='detail'>$value</textarea></td>");
				}
		}
?>

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Question by:José Perez
18 Comments
 
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Expert Comment

by:wmcdon7160
ID: 33501487
The $_POST variable and your URL examples don't match. Was that intentional?
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Expert Comment

by:Ray Paseur
ID: 33501511
Use var_dump($_POST) to see the contents of the POST array.  If you're still unsure, please post that output here.  Thanks, ~Ray
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Author Comment

by:José Perez
ID: 33501991
wmcdon7160, if you mean "DocID" is different to "doc_id", that is correct, is intentional for not confusing.

Ray_Paseur, this is the result:

array(2) { ["DocID"]=> array(2) { [0]=> string(1) "1" [1]=> string(1) "2" } ["mySubmit"]=> string(19) "Send Document Links" } var_dump1 2
Warning: Invalid argument supplied for foreach() in C:\AppServ\www\oge\send.php on line 11
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Author Comment

by:José Perez
ID: 33501992

sorry:

array(2) { ["DocID"]=> array(2) { [0]=> string(1) "1" [1]=> string(1) "2" } ["mySubmit"]=> string(19) "Send Document Links" } var_dump1 2
Warning: Invalid argument supplied for foreach() in C:\AppServ\www\dms\send.php on line 11

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Accepted Solution

by:
Ray Paseur earned 100 total points
ID: 33502070
You might want to use foreach on $_POST["DocID"].

This code construct...

$SelectedDocuments = implode("\n", $_POST['DocID']);
foreach ($SelectedDocuments as $key=>$value)

... turns the POST data into a string - almost certainly not what you want.
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Author Comment

by:José Perez
ID: 33502622
first of all, i think we should make the foreach work. maybe that is the key!
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Expert Comment

by:Ray Paseur
ID: 33502839
Let's look at this code.

$SelectedDocuments = implode("\n", $_POST['DocID']);
foreach ($SelectedDocuments as $key=>$value)

The first line returns the value of the implode() function.  See the man page here:
http://us3.php.net/manual/en/function.implode.php
To quote, "Returns a string containing a string representation of all the array elements in the same order, with the glue string between each element."

The second line uses the string, incorrectly, in foreach().  See the man page here:
http://us3.php.net/manual/en/control-structures.foreach.php
To quote, "foreach works only on arrays, and will issue an error..."

As I wrote above, "You might want to use foreach on $_POST["DocID"]."
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Author Comment

by:José Perez
ID: 33502995
i have tried hundres of times to see where is my error on the forech sentence, cant see it! i'm frustrated. i even looked into google, and also read the man pages but i still can't see where's the error.

please help.
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Expert Comment

by:Ray Paseur
ID: 33503063
Please post the code as you have it now, so that I can install it on my server and run it, thanks.
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Author Comment

by:José Perez
ID: 33503781
i tried this code, but it didn't work either :(

$SelectedDocuments = implode("http://localhost/dms/detail.php?doc_id=", $_POST['DocID']);
<?php

	if (isset($_POST['DocID'])) 
		{
			//$ruta="http://localhost/dms/detail.php?doc_id=";
			var_dump($_POST);
			$SelectedDocuments = implode("\n", $_POST['DocID']);
			echo var_dump;
			echo $SelectedDocuments;
			
			foreach ($SelectedDocuments as $key)
				{
					echo $key;
				}
		}
?>

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Expert Comment

by:Ray Paseur
ID: 33504307
Two questions:  (1) What is the EXACT URL you used to run this script when you tested it, and (2) What did you find in $_POST, printed out on line 6?

I think we are getting close if we can find those things out.
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Author Comment

by:José Perez
ID: 33504623
http://localhost/dms/send.php is the url of this page. that comes from the http://localhost/dms/list.php wich is a page that contains a list of documents with checkboxes where a user can select 1 or more documents and those links are sent to "send.php"

send.php it's supposed to be a textbox/textarea where the links are copied to... but concatenated with $ruta, that is the url, so finally the user receives a link to that specific documents.

$_POST contains the ids othe documents selected in the previous page, for example, if i select 4 documents, it sends those documents id's, example, 1,3,5,6 if i chosee those 4 checkboxes.
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Expert Comment

by:Ray Paseur
ID: 33504746
Please let me ask this again.  Please just copy and paste the answers - I do not need an explanation, I need to see the ACTUAL data.

(1) What is the EXACT URL you used to run ONLY THIS this script when you tested it, and (2) What did you find in $_POST, printed out on line 6?
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Author Comment

by:José Perez
ID: 33504939
the url is a "send.php" submit button that is located under http://localhost/dms/send.php

if i select checkoxes 1, 3 and 6, the result is the following:

array(2) { ["DocID"]=> array(3) { [0]=> string(1) "1" [1]=> string(1) "3" [2]=> string(1) "6" } ["mySubmit"]=> string(19) "Send Document Links" }

hope this helps.
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Expert Comment

by:Ray Paseur
ID: 33505117
I think so.  See if this code makes sense.  $_POST["DocID"] is an array, so you need to use an iterator on that array.
foreach ($_POST["DocID"] as $thing)
{
   echo "<br/>$thing";
}

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Author Comment

by:José Perez
ID: 33505257
that d like a charm!

now we have added the "return"amongst id's, now we need to add the concatenation with the prefix "http://localhost/dms/detail.php?doc_id="

the result should be displayed into the textarea, code below:

<td><textarea name="detail" cols="50" rows="4" id="detail"><?=$SelectedDocuments?></textarea></td>

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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 34221210
This question has been classified as abandoned and is being closed as part of the Cleanup Program.  See my comment at the end of the question for more details.
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