I have an issue with my loops to show the result - php

Question

$array_of_time = array ();
$start_time = strtotime ("$app_date 07:00");
$end_time = strtotime ("$app_date 22:00");
$mins = 04 * 60;
while ($start_time <= $end_time)
{
$array_of_time[] = date ('h:i a', $start_time);
$start_time += $mins;
}
echo "<div style='width:700px' class='time_slot_div'>";
echo "<p class='time_slot_p'> Time Slot :</p>";
foreach($array_of_time as $key=>$value)
{
for($i = 0; $i < count($app_data); $i++)
{
$book_time=$app_data[$i]["appointment_time"];
if($value==$book_time)
{
echo "<a class='time_slot_a_book'>$value</a> ";
} else {
echo "<a href='#' onclick='get_time_value(\"$value\");' class='time_slot_a'>$value</a> ";
}
}
}
echo "</div>";
Here foreach loop can run as many time as it can as well as for loop also, but i want to show the links that are not matched with the foreach value and for loop value.
The foreach loop values like 7:20 am not from database but the for loop value like 7:20 am is from database so if 7:20 am==7:20 am then the if statement it run it is working fine, but the issue is that it is running 2 time if i get 2 value in for loop. It should run my div only once.

Answer 1

Use a array to store the item that has shown.
<?php
foreach($array_of_time as $key=>$value)
{
$tag_list = array();
for($i = 0; $i < count($app_data); $i++)
{
$book_time=$app_data[$i]["appointment_time"];
// shown, skip
if (isset($tag_list[$book_time]))
{
continue;
}
// mark as show
$tag_list[$book_time] = 1;
if ($value == $book_time)
{
echo "<a class='time_slot_a_book'>$value</a> ";
}
else
{
echo "<a href='#' onclick='get_time_value(\"$value\");' class='time_slot_a'>$value</a> ";
}
}
}