<?php
 
function convert($t)
{
	list ($h, $m, $s) = explode(':', $t);
	return $s + 60 * ($m + 60 * $h);
}
 
$one_day = 24 * 60 * 60;
$starttime1 = convert('23:00:00');
$endtime1 = convert('04:00:00');
 
if ($endtime1 < $starttime1) {
	$endtime1 += $one_day;
}
 
$starttime2 = convert('19:00:00');
$endtime2 = convert('23:30:00');
 
if ($endtime2 < $starttime2) {
	$endtime2 += $one_day;
}
 
if (($endtime2 >= $starttime1 && $endtime2 <= $endtime1) ||
    ($starttime2 >= $starttime1 && $starttime2 <= $endtime1))
{
    echo ("intersect");
} else {
    echo ("doesn't intersect");
}
 
?>
// your code goes here

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