Online PHP editor | rfc for MTf4E

@ 2020-05-08T22:20:36Z

<?php

$subjectSlots = [
    "tamil"   => [1, 2, 3, 4, 5],
    "english" => [4, 5, 6],
    "maths"   => [1, 5, 8],
    "social"  => [1, 2, 5],
    "pt"      => [1],
    "hindi"   => [3, 4, 7]
];
$requiredSubjects = ['tamil', 'tamil', 'pt', 'maths', 'maths', 'social', 'hindi', 'english'];

usort($requiredSubjects, function($a, $b) use ($subjectSlots) {
    return $subjectSlots[$a] <=> $subjectSlots[$b];  // sort by length, then by values
});

function fillSlots($requiredSubjects, $availableSlots, $filledSlots = []) {
	if (!$requiredSubjects) {
		ksort($filledSlots);
		return $filledSlots;
	}
    foreach ($requiredSubjects as $rIndex => $subject) {
        foreach ($availableSlots[$subject] as $sIndex => $slot) {
            if (!isset($filledSlots[$slot])) {
                unset($requiredSubjects[$rIndex], $availableSlots[$subject][$sIndex]);
                $result = fillSlots(
					$requiredSubjects,
					$availableSlots,
					array_replace($filledSlots, [$slot => $subject])
				);
				if ($result) {
					return $result;
				}
            }
        }
    }
}

var_export(fillSlots($requiredSubjects, $subjectSlots));

Output for git.master, git.master_jit, rfc.property-hooks: array ( 1 => 'pt', 2 => 'social', 3 => 'tamil', 4 => 'tamil', 5 => 'maths', 6 => 'english', 7 => 'hindi', 8 => 'maths', )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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
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