UGN Security Forums UGN Security: Knowledge Base Programming Web Design, Protocols & Other Languages problem with multidemensional arrays

Print Thread

Rate Thread

problem with multidemensional arrays

#18686 10/13/05 12:18 AM

Joined: Sep 2005

Posts: 102

Sacramento, CA

Testing

UGN Member

Testing

UGN Member

Joined: Sep 2005

Posts: 102

Sacramento, CA

I am currently working on a project from the book. It is a very simple form. However the script to handle the form simply isnt working and I cant figure it out. I swear I have checked and double checked my syntax over and over. I was hoping someone might be able to give it a peek and tell me where im messing up. Thanks in advance.

The Form

Code

 <form action="handle_about.php" method="post">
<fieldset><legend>Enter your information in the form below </legend>


<b>Name:</b> <input type="text" name ="name" size="20" maxlength="40" />


<b>Interests:</b>
<input type="checkbox" name="interests[]" value="Music" /> Music
<input type="checkbox" name="interests[]" value="Books" /> Books
<input type="checkbox" name="interests[]" value="Skiing" /> Skiing
<input type="checkbox" name="interests[]" value="Napping" /> Napping

</fieldset>
<div align="center"><input type="submit" name="submit" value="Submit Information" /></div>
</form>

The script handling the form :

Code

<?php 


if (strlen($_POST['name']) > 0) {
	$name = stripslashes($_POST['name']);
	
} else { // If no name was entered...
	$name = NULL;
	echo '

<b>You forgot to enter your name!</b>';
}

//Check $interests[]
if (isset($_POST['interests'])) {
	$ints = NULL; //New message to be used.
	foreach ($_POST['interests']) as $key => $value) { //loop through each.
		$ints .= "$value, ";

}
$ints = substr($ints, 0, -2);
$interests = TRUE;
		
} else {
	$interests = NULL;
	echo '

<b>You forgot to enter your interests!</b>';
	
	}
	
if ($name && $interests) {
echo "Thank you, <b>{$_POST['name']}</b>.  You entered interests as:
<tt>$ints</tt>";

}


?>

All I get is a blank page.

Sponsored Links

▼ Sponsored Links ▼ ▲ Sponsored Links ▲

Re: problem with multidemensional arrays

#18687 10/13/05 01:31 PM

Joined: Dec 2002

Posts: 3,255

Likes: 3

Maryland

§intå×

UGN Elite

§intå×

UGN Elite

Joined: Dec 2002

Posts: 3,255

Likes: 3

Maryland

Code

 
<?
if(!$cmd){
//start form
?>
 <form action="index.php?cmd=send" method="post">
	<fieldset>
		<legend>
			Enter your information in the form below 
		</legend>
		<br/>
		<strong>
			Name:
		</strong>
			<input type="text" name ="myname" size="20" maxlength="40" />
		<br/>
		<strong>
			Interests:
		</strong>
			<input type="checkbox" name="interests[]" value="Music" /> Music
			<input type="checkbox" name="interests[]" value="Books" /> Books
			<input type="checkbox" name="interests[]" value="Skiing" /> Skiing
			<input type="checkbox" name="interests[]" value="Napping" /> Napping
		<br/>
	</fieldset>
	<div align="center">
			<input type="submit" name="submit" value="Submit Information" />
	</div>
</form> 
<?
//process form

}else if($cmd == "send"){
print_r($interests);
if (strlen($_POST['myname']) > 0) {
	$myname = stripslashes($_POST['myname']);
}else{ // If no name was entered...
	$myname = NULL;
	echo '

<b>You forgot to enter your name!</b>';
}
//Check $interests[]
if (isset($_POST['interests'])) {
	$ints = NULL; //New message to be used.
	foreach ($_POST['interests'] as $key => $value) {     //loop through each.
		$ints .= "$value, ";
	}
	$ints = substr($ints, 0, -2);
	$interests = TRUE;
}else{
	$interests = NULL;
	echo '

<b>You forgot to enter your interests!</b>';
}
if ($name && $interests) {
		echo "Thank you, <b>{$_POST['name']}</b>.  You entered interests as:
<tt>$ints</tt>";
	}
}

Try that. this is just an array not a multi demmensional array. I added the Print_r(); function on line 33 so you can see the array. you can add the pre tags to this to keep the formatting. Chec it out

Code

echo "<pre>";
print_r($interests);
echo "</pre>";

Now your out put should look something like

Code

Array
(
    [0] => Music
    [1] => Books
    [2] => Napping
)

Re: problem with multidemensional arrays #18688 10/13/05 04:48 PM
Joined: Dec 2002 Posts: 3,255 Likes: 3 Maryland §intå× UGN Elite
§intå× UGN Elite Joined: Dec 2002 Posts: 3,255 Likes: 3 Maryland	Oh I forgot. You will see I put all the code on one page. I find this easier to keep track of later. a good way in my oppion to verify data came from a form is Code <input type="hidden" value="<? $this_val = md5($_SERVER['REMOTE_ADDR']); echo "$this_val"; ?>" name="secure_id"> then in the form processing script Code $my_security = md5($_SERVER['REMOTE_ADDR']); if($secure_id == "$my_security"){ //do form processing here }else{ echo "Please use our form to submit data thank you"; } For more security use crypt instead of MD5 which I belive to be machine specific. What this dose is encrypts the users IP address with an MD5 hash. Then on the form Processing page we check the the value sent matches when we do it again. For dynamic IP addresses this will change often but should be fine to post the form data. But if they come back they will not be able to use the same MD5 hash to submit data without the form using the GET method.

Re: problem with multidemensional arrays #18689 10/13/05 07:24 PM
Joined: Feb 2002 Posts: 7,203 Likes: 11 Portland, OR; USA Gremelin Community Owner
Gremelin Community Owner Joined: Feb 2002 Posts: 7,203 Likes: 11 Portland, OR; USA	'eh I like to generate the secure_id with a combination of server ip or name and the users ip; as if the user's ip changes per page they're using a proxy swapper and I don't want to deal with them anyway ... Donate to UGN Security here. UGN Security, Back of the Web, and VNC Web Services Owner

Re: problem with multidemensional arrays #18690 10/13/05 07:40 PM
Joined: Apr 2005 Posts: 247 USA KillHour UGN Member
KillHour UGN Member Joined: Apr 2005 Posts: 247 USA	That's not very considerate to us AOHellers, giz :p "We can categorically state that we have not released man-eating badgers into the area." -UK military spokesman Major Mike Shearer

Re: problem with multidemensional arrays #18691 10/14/05 12:14 AM
Joined: Dec 2002 Posts: 3,255 Likes: 3 Maryland §intå× UGN Elite
§intå× UGN Elite Joined: Dec 2002 Posts: 3,255 Likes: 3 Maryland	Verizon now offers $14.95 DSL. Drop AOhell

Re: problem with multidemensional arrays #18692 10/14/05 01:36 AM
Joined: Apr 2005 Posts: 247 USA KillHour UGN Member
KillHour UGN Member Joined: Apr 2005 Posts: 247 USA	I'm not going through this again... My IRC Logs With Inf.: Quote: [18:38] <shadow516> indeed [18:38] <Infinite> hrm... [18:38] <Infinite> aol... [18:38] <shadow516> ... [18:38] * Infinite thinks... [18:39] <shadow516> the strange thing is [18:39] <shadow516> that I HAVE broadband [18:39] <shadow516> but my parents are too lazy to pick up the router [18:39] <shadow516> so I'm stuck with dialup untill further notice [18:39] <shadow516> [18:39] <shadow516> how's that for funny? [18:40] <Infinite> nice [18:40] * shadow516 kicks wall [18:40] <shadow516> ow [18:41] <Infinite> hrm [18:41] <Infinite> lets see if this works on you now... [18:41] <shadow516> [censored] [18:42] <shadow516> I can tell what's comming [18:42] * shadow516 cowers at inf's 1337 skillz [18:43] <Infinite> omg it does [18:43] <Infinite> hahahaha [18:43] <Infinite> bye shadow Session Close: Mon Oct 10 18:43:34 2005 Note to self: Things that start with "* shadow516 slaps Infinite - Take that [censored]!" always end with "bash-3.00# ping -p 2b2b2b415448300d 172.131.40.24" "We can categorically state that we have not released man-eating badgers into the area." -UK military spokesman Major Mike Shearer

Re: problem with multidemensional arrays #18693 10/14/05 01:50 AM
Joined: Feb 2002 Posts: 7,203 Likes: 11 Portland, OR; USA Gremelin Community Owner
Gremelin Community Owner Joined: Feb 2002 Posts: 7,203 Likes: 11 Portland, OR; USA	Heh, get yourself a good wireless router (Linksys WRT54G or WRT54GS) ... Donate to UGN Security here. UGN Security, Back of the Web, and VNC Web Services Owner

Re: problem with multidemensional arrays #18694 10/15/05 03:35 AM
Joined: Dec 2002 Posts: 3,255 Likes: 3 Maryland §intå× UGN Elite
§intå× UGN Elite Joined: Dec 2002 Posts: 3,255 Likes: 3 Maryland	Hey Testing, did this help at all? The code i posted works. It also makes it one page instead of 2.

Re: problem with multidemensional arrays #18695 10/15/05 04:34 AM
Joined: Sep 2005 Posts: 102 Sacramento, CA T Testing UGN Member
Testing UGN Member T Joined: Sep 2005 Posts: 102 Sacramento, CA	SORRY, Haven't worked on it today at all. Life has gotten in the way. Just got back from training and will check it tonight. Thanks for the help with this!

Re: problem with multidemensional arrays #18696 10/20/05 06:49 PM
Joined: Sep 2005 Posts: 102 Sacramento, CA T Testing UGN Member
Testing UGN Member T Joined: Sep 2005 Posts: 102 Sacramento, CA	Sorry it has taken me so long. Been absolutely slammed. I have checked out your script you made. Works perfectly! It did help on the fact I can see the script work now however it doesn't help me figure out what I was doing wrong. Either way at least I can see the script in action. Granted im now able to basically understand whats gonna happen without running every single script! WOOHOO the learning has begun!! So bonehead question # 2001 comming up. in your script you have (!$cmd) What does the ! do?

Re: problem with multidemensional arrays #18697 10/20/05 08:18 PM
Joined: Feb 2002 Posts: 7,203 Likes: 11 Portland, OR; USA Gremelin Community Owner
Gremelin Community Owner Joined: Feb 2002 Posts: 7,203 Likes: 11 Portland, OR; USA	basically ! means "if no" thus, (!$cmd) is "if no command" or "if command is empty"; I use the same in some of my scripts to do basically the same as if($action == "") (so that'd be (!$action)) Donate to UGN Security here. UGN Security, Back of the Web, and VNC Web Services Owner

Re: problem with multidemensional arrays #18698 10/20/05 08:20 PM
Joined: Dec 2002 Posts: 3,255 Likes: 3 Maryland §intå× UGN Elite
§intå× UGN Elite Joined: Dec 2002 Posts: 3,255 Likes: 3 Maryland	Not a bone headed question. I used this for about 10 scripts before I understood what was going on. lol It is funny how you can code something and truely have no clue how it works. Code if(!$cmd){ } The above code say basically this. If the variable $cmd has nothing set to it or does not exist. Do the code between the curly brackets { and }. Code Line \| Code ----------------------------------- 1 \| if(!$cmd){ 2 \| }else if($cmd == "process_form"){ 3 \| } You are now familar with Line 1. If $cmd has no value do what is inbetween { and }. Line 2 we have else if($cmd == "process_form"){ this is saying else - $cmd has a value if($cmd == - $cmd is a perfect match for (use 1 "=" for un perfect matches(not ideal for security)) "process_form" - the name that was passed in the $cmd variable. and Line 3 I think you will get. Now how do we set the $cmd value? Where did I get $cmd from? First off $cmd can be anything. $cmd could easily be $deez_nuts or $action or anything you want it to be. To se the value you could use the form tag.. Code <form action="http://somesite.com/form.php?cmd=process_form" method="POST"> notice the "?cmd=process_form." You could also use a hidden input tag Code <input type="hidden" name="cmd" value="process_form"> or even a select element Code <select name="cmd"> <option value="process_form">Process option 1</option> <option value="process_form2">Process option 2</option> <option value="process_form3">Process option 3</option> </select> Now you can get reall tricking and have this also... Code if(!$cmd){ //provide a form }else if($cmd == "process_form"){ if(!$action){ //do basic form process }else if($action == "advanced"){ //do advance form process }//end action variables }//end cmd variables Just remeber to keep them nested and keep the code easy to read for yourself. Nothing suck more than trying to find that bug through 10,000 lines of code and it is all aligned left.

Re: problem with multidemensional arrays #18699 10/20/05 08:28 PM
Joined: Dec 2002 Posts: 3,255 Likes: 3 Maryland §intå× UGN Elite
§intå× UGN Elite Joined: Dec 2002 Posts: 3,255 Likes: 3 Maryland	You sound like you have some ideas as to what is going on. Let me make a sugestion. Give yourself a basic idea. Then code it. For example... form asking for - name - rant - email that sends to a PHP processor that takes the data and put it to the screen. Play with it, tweek it. understand it the build on it. I think when you start with an idea you want to make happen you will really see it all click. and do not feel you are ever buging me in here. You got a free pass man, I will answer any question you have because i know you will do the research and apply the answer. happy coding.

Link Copied to Clipboard

Member Spotlight

None yet

Forum Statistics

Forums41

Topics33,840

Posts68,858

Members2,176

Most Online3,253
Jan 13th, 2020

Latest Postings