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@ 2017-03-13T16:31:56Z

<?php
$a = [1,2,3,4,13];

$nxt = $a[0];
    $cnt = count($a);
    $j = 0;
    $ret = [];
    
for ($i = 1; $i < $cnt; ++$i) {

        $pre = $nxt;
        $diff = $nxt;
            //        ---- WAIT LIKE AGES FOR $a[$i]
        $nxt = $a[$i];
        
        //$k = $a[$i + 1];

        //$diff = $nxt - $pre; // MOV diff,nxt SUB diff,pre LATENCY: 2
        //$diff = $pre - $nxt;
        $diff -= $nxt;
        $ret[$j++] = $pre;
        
        // branch
        if ($diff == -1) { // raising range
            do {
                ++$nxt;
                ++$i;
            } while ($a[$i] == $nxt);
            --$nxt;
            $ret[$j] = "$pre-$nxt";// . ($nxt - 1);
        } elseif ($diff == 1) { // found falling range
            ++$i;

            while ($a[$i] == --$nxt) { // search end of range
                ++$i;
            }
            $ret[$j] = "$pre-" . ($nxt + 1);
            $nxt = $a[$i];
        }

    }

Output for git.master, git.master_jit, rfc.property-hooks

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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