$_POST Array from html form

Question

I am trying to send data from multiple checkboxes (id[]) and create an array "info" in php to allow me to run a script for each value (however the quantity of values may change each time) however first I am trying to display the content of each array value. I am not quite sure how to put my array populating line to save all the content to the array.

HTML

echo("<input name='id[]' type='checkbox' value='".$shopnumb."'>");

my hopeful processing code currently is -

$info=$_POST['id[]'];
Echo(array_values($info));

what do I need to do to make the content sent by post from the form checkboxes populate the array info

any help is greatly appreciated

edited for clarification.

Ross Smith II · Accepted Answer · 2012-07-26 18:50:12Z

44

Change

$info=$_POST['id[]'];

to

$info=$_POST['id'];

by adding [] to the end of your form field names, PHP will automatically convert these variables into arrays.

answered Jul 26, 2012 at 18:50

Ross Smith II

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1 Comment

James Stafford Over a year ago

thank you this was probably my biggest problem - I wasn't even thinking about it.

Fanda · Accepted Answer · 2012-07-26 18:54:37Z

17

You should get the array like in $_POST['id']. So you should be able to do this:

foreach ($_POST['id'] as $key => $value) {
    echo $value . "<br />";
}

Input names should be same:

<input name='id[]' type='checkbox' value='1'>
<input name='id[]' type='checkbox' value='2'>
...

answered Jul 26, 2012 at 18:54

Fanda

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1 Comment

andreszs Over a year ago

This is the only answer which really makes sense

Community · Accepted Answer · 2022-03-31 13:55:48Z

8

On the form page, field names must look like this

<input name="id[]" type="checkbox" value="x">
<input name="id[]" type="checkbox" value="y">
<input name="id[]" type="checkbox" value="z">

On the destination page, $_POST['id'] is your array variable

$id = implode(",", $_POST['id']);
echo $id; //Should print "1,2,3"

You cannot echo an array directly, because it will just print out "Array". If you wanna print out the array values use print_r.

print_r($_POST['id']);

edited Mar 31, 2022 at 13:55

CommunityBot

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answered Jul 26, 2012 at 18:52

Johndave Decano

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4 Comments

Johndave Decano Over a year ago

You used id[] which means that you are passing an array. This is used if you want to pass multiple checkboxes. If you just want to pass one checkbox just use name="id"

James Stafford Over a year ago

I am passing possibly 1 possibly 500

ButcherFromHell Over a year ago

And how to performe an update with such posted arrays? foreach ($_POST[id] as $id) { $update = UPDATE table SET name = ??? WHERE id = $id}? name is also an array

ButcherFromHell Over a year ago

OK I got it - I count elements in array and repeat update as many times as counted times with other array variables looked like $_POST[var][$i] - and that is it

NotGaeL · Accepted Answer · 2012-07-26 19:38:57Z

2

I don't know if I understand your question, but maybe:

foreach ($_POST as $id=>$value)
    if (strncmp($id,'id[',3) $info[rtrim(ltrim($id,'id['),']')]=$_POST[$id];

would help

That is if you really want to have a different name (id[key]) on each checkbox of the html form (not very efficient). If not you can just name them all the same, i.e. 'id' and iterate on the (selected) values of the array, like: foreach ($_POST['id'] as $key=>$value)...

edited Jul 26, 2012 at 19:38

answered Jul 26, 2012 at 18:56

NotGaeL

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