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@ 2019-03-13T09:56:20Z

<?php

// https://stackoverflow.com/questions/55137231
$cases =
[
    [[], false],
    [[1], false],
    [[1,2], false],
    [[1,3], true],
    [[1,2,3], false],
    [[1,2,4], true],
    [[2,3,5,6], true],
    [[2,5,6,8], false],
    [[3,6,10,16], false],
    [[5,7,8,9,10,11], true],
];

// Assuming zero indexed and sequential keys in array.
function missing_only_one_incremental_value_in_sequence(array $nums)
{
    $count     = count($nums);
    $seq_count = 0;
    for($i=1; $i<$count; $i++)
        if($nums[$i]==$nums[$i-1]+1)
            $seq_count++;

    return $seq_count == $count-2;
}

foreach($cases as $case) {
    echo implode(',', $case[0]);
    echo "\n";
    $result = missing_only_one_incremental_value_in_sequence($case[0]);
    var_dump($result);
    echo $result == $case[1] ? 'Pass' : 'Fail';
    echo "\n\n";
}

Output for git.master, git.master_jit, rfc.property-hooks: bool(false) Pass 1 bool(false) Pass 1,2 bool(false) Pass 1,3 bool(true) Pass 1,2,3 bool(false) Pass 1,2,4 bool(true) Pass 2,3,5,6 bool(true) Pass 2,5,6,8 bool(false) Pass 3,6,10,16 bool(false) Pass 5,7,8,9,10,11 bool(true) Pass

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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
2013-09-22 Anonymous classes - included in PHP 7

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