PHP - Loop number of selected check boxes on form submit - php

Question

I have an issue where I need to loop the number of check boxes on a form submit. Foreach check box that is looped I need to then insert data into the database.
How Would I go about looping over the amount of check boxes that have being passed via form submit?
My code is as follows:
Form:
<form action="createChallenge.php" method="post" name="chalCreate">
Challenge Name:<input type="text" name="chalName" />
<br />
Challenge Target:<input type="text" name="chalTarget"/>
<br />
End Date:<input type="text" name="chalDate">
<br />
<!-- Needs a jquery datepicker -->
Select Friends: <br />
<?php
$selFriend = $conn->prepare("SELECT * FROM Friends WHERE UserID = '$userID' AND Friend = 'y' ORDER BY FriendName ASC");
$selFriend->execute();
foreach($selFriend as $row){
?>
<input type="checkbox" name="test" value="<?php echo $row['FriendID'] ?>"><?php echo $row['FriendName'] ?><br>
<?php
}
?>
<br />
<button type="submit">Create Challenge</button>
</form>
PHP to handle the form:
<?php
if(isset($_POST['test']))
{
$i = 0;
foreach($_POST['test'] as $checked)
{
echo $friend = $checked;
$i++;
}
echo $name = $_POST['chalName'];
echo $target = $_POST['chalTarget'];
echo $date = $_POST['chalDate'];
echo $friend = $_POST['test'];
echo $setby = $_COOKIE['userID'];
$create = $conn->prepare("INSERT INTO Challenge ( chalSetBy, chalName, chalTarget, chalDate ) VALUES ('$setby', '$name', '$target', '$date') ");
$create->execute();
if($create)
{
echo "Challenge made successfully";
}
else
{
echo "There was a problem";
}
}
?>
I thought doing the following would echo out data, but it didn't, it only selected the last check box:
$i = 0;
foreach($_POST['test'] as $checked)
{
echo $friend = $checked;
$i++;
}

Answer 1

Make an array of your checkbox in HTML page like as below,
<form name="frm" method="post">
<input type="checkbox" value="1" name="test[]">
<input type="checkbox" value="2" name="test[]">
<input type="checkbox" value="3" name="test[]">
<input type="checkbox" value="4" name="test[]">
<input type="checkbox" value="5" name="test[]">
<input type="checkbox" value="6" name="test[]">
<input type="submit">
</form>
<?php
foreach($_POST['test'] as $key=>$value)
{
echo $value."<br>";
}