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@ 2013-09-02T09:46:14Z

<?php

$intervals = [
	['from_time' => '15:00', 'to_time' => '17:15'],
	['from_time' => '10:00', 'to_time' => '12:15'],
	['from_time' => '09:00', 'to_time' => '11:15'],
	['from_time' => '09:00', 'to_time' => '11:15'],
	['from_time' => '14:00', 'to_time' => '16:15'],
	['from_time' => '15:00', 'to_time' => '17:15'],
];

$overlaps = [];

foreach ($intervals as $interval) {
	$key = null;
	foreach ($overlaps as $_key => $_intervals) {
		foreach ($_intervals as $_interval) {
			if (
				($_interval['from_time'] <= $interval['from_time'] && $interval['from_time'] <= $_interval['to_time']) 
				||
				($_interval['from_time'] <= $interval['to_time'] && $interval['to_time'] <= $_interval['to_time'])
			) {
				$key = $_key;
				break 2;
			}
		}
	}
	if (is_null($key)) {
		$key = count($overlaps);
	}
	$overlaps[$key][] = $interval;
}
foreach ($overlaps as &$overlap) {
	$from = '00:00';
	$to = '23:59';
	foreach ($overlap as $_interval) {
		$from = max($from, $_interval['from_time']);
		$to = min($to, $_interval['to_time']);
	}
	$overlap = ['from_time' => $from, 'to_time' => $to];
}
unset($overlap);

print_r($overlaps);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [from_time] => 15:00 [to_time] => 16:15 ) [1] => Array ( [from_time] => 10:00 [to_time] => 11:15 ) )

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2020-03-21 RFC: Is_Literal - declined
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2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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