validating arrays from a form

[benluke]

Hi,

I would like to learn how to validate arrays. I need to make sure that at least one check box has been selected from each set.

I have the following html within a form
[code]
<input type="checkbox"  name="knowledge1[]" value="A">
<input type="checkbox"  name="knowledge1[]" value="B">
<input type="checkbox"  name="knowledge1[]" value="C">
<input type="checkbox"  name="knowledge1[]" value="D" >

<input type="checkbox"  name="knowledge2[]" value="A">
<input type="checkbox"  name="knowledge2[]" value="B">
<input type="checkbox"  name="knowledge2[]" value="C">
<input type="checkbox"  name="knowledge2[]" value="D" >

<input type="checkbox"  name="knowledge3[]" value="A">
<input type="checkbox"  name="knowledge3[]" value="B">
<input type="checkbox"  name="knowledge3[]" value="C">
<input type="checkbox"  name="knowledge3[]" value="D" >
[/code]

I then pass it and serialize it

[code]
$pc1=serialize($_POST['knowledge1']); //grab the array data and seaialize it to store in db
$pc2=serialize($_POST['knowledge2']);
$pc3=serialize($_POST['knowledge3']);
[/code]

Should i validate it before serializing? What is the best way to do this?

Benluke

[zq29]

If I can remember correctly, if a checkbox is not checked its name is not passed as a key in the $_POST array, so it would be as easy as just checking if the array key is set.

[benluke]

Hi,

ok so how would i go about doing that. Would i be looking at using the isset function?

benluke

[zq29]

[!--quoteo(post=385997:date=Jun 20 2006, 02:08 PM:name=benluke)--][div class=\'quotetop\']QUOTE(benluke @ Jun 20 2006, 02:08 PM) [snapback]385997[/snapback][/div][div class=\'quotemain\'][!--quotec--]
Hi,

ok so how would i go about doing that. Would i be looking at using the isset function?

benluke
[/quote]
Pretty much, yeah.
[code]if(!isset($_POST['knowledge1'])) echo "No checkboxes were selected for Knowledge 1";[/code]

[benluke]

Thanks for the help SemiApocalyptic

much appreciated

benluke

[zq29]

No problem :)