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

<?php

$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: Warning: Undefined variable $intervals in /in/JpRmC on line 5 Warning: foreach() argument must be of type array|object, null given in /in/JpRmC on line 5 Array ( )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
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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