getting a checkbox array value from POST - php

Question

i am posting an array of checkboxes. and i cant get it to work. i didnt include the proper syntax in the foreach loop to keep it simple. but it is working. i tested in by trying to do the same thing with a text field instead of a checkbox and it worked with the textfield.
<form method="post">
<?php
foreach{
echo'
<input id="'.$userid.'" value="'.$userid.'" name="invite[]" type="checkbox">
<input type="submit">';
}
?>
</form>
here is the part that is not working. it is echoing 'invite' instead of array.
<?php
if(isset($_POST['invite'])){
$invite = $_POST['invite'];
echo $invite;
}

Answer 1

Your $_POST array contains the invite array, so reading it out as
<?php
if(isset($_POST['invite'])){
$invite = $_POST['invite'];
echo $invite;
}
?>
won't work since it's an array. You have to loop through the array to get all of the values.
<?php
if(isset($_POST['invite'])){
if (is_array($_POST['invite'])) {
foreach($_POST['invite'] as $value){
echo $value;
}
} else {
$value = $_POST['invite'];
echo $value;
}
}
?>

Answer 2

I just used the following code:
<form method="post">
<input id="user1" value="user1" name="invite[]" type="checkbox">
<input id="user2" value="user2" name="invite[]" type="checkbox">
<input type="submit">
</form>
<?php
if(isset($_POST['invite'])){
$invite = $_POST['invite'];
print_r($invite);
}
?>
When I checked both boxes, the output was:
Array ( [0] => user1 [1] => user2 )
I know this doesn't directly answer your question, but it gives you a working example to reference and hopefully helps you solve the problem.

Answer 3

Check out the implode() function as an alternative. This will convert the array into a list. The first param is how you want the items separated. Here I have used a comma with a space after it.
$invite = implode(', ', $_POST['invite']);
echo $invite;

Answer 4

// if you do the input like this
<input id="'.$userid.'" value="'.$userid.'" name="invite['.$userid.']" type="checkbox">
// you can access the value directly like this:
$invite = $_POST['invite'][$userid];

Answer 5

Because your <form> element is inside the foreach loop, you are generating multiple forms. I assume you want multiple checkboxes in one form.
Try this...
<form method="post">
foreach{
<?php echo'
<input id="'.$userid.'" value="'.$userid.'" name="invite[]" type="checkbox">
<input type="submit">';
?>
}
</form>