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@ 2019-07-20T11:01:34Z

<?php

$people = [
    [1801, 1887],
    [1943, 1943],
    [1949, 2001],
    [1751, 1803],
    [1881, 1887],
    [1956, 1983],
    [1954, 1983],
    [1801, 1883],
    [1956, null],
    [1944, 1983],
    [1897, 2015],
    [1965, 1997],
    [1941, 1982],
    [1984, null],
];

$populationPerYear = array_reduce(
    $people,
    static function($carry, $current) {
        [$from, $to] = $current;
        for($i = $from; $i <= $to; $i++) {
            if (!isset($carry[$i])) {
                $carry[$i] = 1;
            } else {
                $carry[$i]++;
            }
        }
        return $carry;
    },
    []
);
ksort($populationPerYear);
$peak = max($populationPerYear);

$peakYears = array_filter(
  $populationPerYear,
  static function($population) use ($peak) {
      return $population === $peak;
  }
);

var_dump($peak, $peakYears);

Output for git.master, git.master_jit, rfc.property-hooks: int(7) array(18) { [1965]=> int(7) [1966]=> int(7) [1967]=> int(7) [1968]=> int(7) [1969]=> int(7) [1970]=> int(7) [1971]=> int(7) [1972]=> int(7) [1973]=> int(7) [1974]=> int(7) [1975]=> int(7) [1976]=> int(7) [1977]=> int(7) [1978]=> int(7) [1979]=> int(7) [1980]=> int(7) [1981]=> int(7) [1982]=> int(7) }

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Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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