PHP limit the loop based on available array element - php

Question

I created the available seat with a for loop below:
<?php
$seats = 7;
for ($i=1; $i <= $seats; $i++) {
?>
<div class='col-xs-6'>
<div class='well text-center' id='<?php echo $i ?>'>
Seat No: <?php echo $i ?>
</div>
</div>
<?php
}
?>
And I want to add a booked class if the $i variable matches with the $k variables which taken from the booked seat array elements below:
$booked_seat = array('1','4','5','6','7');
the result:
Array
(
[0] => 1
[1] => 4
[2] => 5
[3] => 6
[4] => 7
)
So I did this:
<?php
$seats = 7;
for ($i=1; $i <= $seats; $i++) {
?>
<div class='col-xs-6'>
<div class='well text-center <?php echo ($i == $booked_seat[$i-1]) ? 'booked' : '' ?>' id='<?php echo $i ?>'>
Seat No: <?php echo $i ?>
</div>
</div>
<?php
}
?>
And i get the offset Error because the $booked_seat is not much as the $seats loop, how to limit the loop so it will not offset?
Thank you before

Answer 1

Try this:
$seats = 7;
for ($i=1; $i <= $seats; $i++) {
?>
<div class='col-xs-6'>
<div class='well text-center <?php echo (in_array($i, $booked_seat)) ? "booked" : "" ?>' id='<?php echo $i ?>'>
Seat No: <?php echo $i ?>
</div>
</div>
<?php
}
?>
warning: code is untested.

Answer 2

You could always flip the $booked_seat array, then test for the existence of the array element using isset(). Something like this:
<?php
$seats = 7;
$booked_seat = array('1','4','5','6','7');
$booked_a = array_flip($booked_seat);
for ($i=1; $i <= $seats; $i++) {
printf("seat: %d%s\n", $i, isset($booked_a[$i]) ? " booked" : "");
}
(This was my test, you can add your HTML to suit.)
Example: http://3v4l.org/5npsm

Answer 3

You should use the method sizeof().
So:
$num_seats = sizeof($seats);
Then a for loop with this.
for($i = 0; $i < $num_seats; $i++){
//code
}