Online PHP editor | rfc for IZA2D

@ 2013-06-26T23:29:00Z

<?php

    function createCompressedString($shorts)
    {
        $compressLen = $compressPos = $currentLen = $currentPos = 0;
        $inBlock = false;
        
        for ($i = 0; $i < 8; $i++) {
            if ($shorts[$i] === 0) {
                if (!$inBlock) {
                    $inBlock = true;
                    $currentPos = $i;
                }

                $currentLen++;
            } else if ($inBlock) {
                if ($currentLen > $compressLen) {
                    $compressLen = $currentLen;
                    $compressPos = $currentPos;
                }

                $inBlock = false;
                $currentPos = $currentLen = 0;
            }
        }
        if ($inBlock) {
            $compressLen = $currentLen;
            $compressPos = $currentPos;
        }

        if ($compressLen === 8) {
            return '::';
        }

        if ($compressLen > 1) {
            if ($compressPos === 0 || $compressPos + $compressLen === 8) {
                array_splice($shorts, $compressPos, $compressLen, ['', '']);
            }
        }

        return implode(':', array_map(function($short) {
            return $short === '' ? '' : dechex($short);
        }, $shorts));
    }

var_dump(createCompressedString([1, 0, 0, 0, 1, 2001, 23234, 21]));

Output for git.master, git.master_jit, rfc.property-hooks: string(21) "1:0:0:0:1:7d1:5ac2:15"

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