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run code in 150+ php & hhvm versions
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<?php function gdr_encode($val) { // all characters that json encode without escaping $chrs = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 !#$%&\'()*+,-.:;<=>?@[]^_`{|}~'; $base = strlen($chrs); $str = ''; while ($val > 0) { $str = $chrs[$val % $base] . $str; $val = (int)($val / $base); } return $str; } function gdr_decode($str) { // all characters that json encode without escaping $chrs = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 !#$%&\'()*+,-.:;<=>?@[]^_`{|}~'; $base = strlen($chrs); $map = array(); for ($i=0; $i<$base; $i++) { $map[$chrs[$i]] = $i; } $val = 0; for ($i=0; $i<strlen($str); $i++) { $val *= $base; $val += (int)$map[$str[$i]]; } return $val; } function duration($val) { if ($val < 24) { return sprintf('%d', $val).'h'; } if ($val < 24*10) { return sprintf('%1.1f', $val/24).'d'; } if ($val < 168*10) { return sprintf('%1.1f', $val/168).'w'; } //if ($val < 730*10) { // return sprintf('%1.1f', $val/730).'m'; //} return sprintf('%1.1f', $val/8760).'y'; } function cmp($val) { return strlen(gdr_encode($val))+2-strlen($val); } function insert(&$vals, $n) { $min = intval('1'.str_repeat('0', $n-1)); $max = intval(str_repeat('9', $n)); $vals[] = $min; $vals[] = $max; $cmp = cmp($min); $cmp_max = cmp($max); if ($cmp === $cmp_max) { return; } while ($min < $max) { $mid = (int)(($min+$max)/2); $k = cmp($mid); echo "$min=>$cmp $mid=>$k $max=>$cmp_max\n"; if ($k == $cmp && $k !== cmp($mid+1)) { $vals[] = $mid; $vals[] = $mid+1; return; } if ($k > $cmp) { $max = $mid-1; } else { $min = $mid+1; } } } $vals = array(0); for ($i=1; $i<8; $i++) { insert($vals, $i); } $vals = array_unique($vals); sort($vals); //$vals = array( // 0, 1, 99, 100, 255, 256, 999, 1000, 9999, 10000, 65535, 65536, 99999, // 100000, 250000, 500000, 750000, 999999, 1000000, 9999999, //4294967295, 4294967296 //); echo sprintf("%7s %7s %7s %4s\n", 'num', 'str', 'time', 'cmp'); foreach ($vals as $val) { $enc = gdr_encode($val); $dec = gdr_decode($enc); if ($dec !== $val) { echo "ERROR: $val => $enc => $dec\n"; } else { echo sprintf("%7d %7s %7s %4d\n", $dec, "\"$enc\"", duration($val), strlen($enc)+2-strlen($val)); } }
based on v1VOD
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
10=>1 54=>1 99=>2 55=>1 77=>1 99=>2 78=>1 88=>1 99=>2 89=>1 94=>2 99=>2 89=>1 91=>1 93=>2 1000=>0 5499=>0 9999=>1 5500=>0 7749=>0 9999=>1 7750=>0 8874=>1 9999=>1 7750=>0 8311=>0 8873=>1 8312=>0 8592=>1 8873=>1 8312=>0 8451=>0 8591=>1 8452=>0 8521=>1 8591=>1 8452=>0 8486=>1 8520=>1 8452=>0 8468=>1 8485=>1 8452=>0 8459=>0 8467=>1 8460=>0 8463=>0 8467=>1 100000=>-1 549999=>-1 999999=>0 550000=>-1 774999=>-1 999999=>0 775000=>-1 887499=>0 999999=>0 775000=>-1 831249=>0 887498=>0 775000=>-1 803124=>0 831248=>0 775000=>-1 789061=>0 803123=>0 775000=>-1 782030=>0 789060=>0 775000=>-1 778514=>-1 782029=>0 778515=>-1 780272=>0 782029=>0 778515=>-1 779393=>0 780271=>0 778515=>-1 778953=>0 779392=>0 778515=>-1 778733=>0 778952=>0 778515=>-1 778623=>-1 778732=>0 778624=>-1 778678=>-1 778732=>0 778679=>-1 778705=>0 778732=>0 778679=>-1 778691=>0 778704=>0 778679=>-1 778684=>-1 778690=>0 778685=>-1 778687=>-1 778690=>0 num str time cmp 0 "" 0h 1 1 "B" 1h 2 9 "J" 9h 2 10 "K" 10h 1 91 "~" 3.8d 1 92 "BA" 3.8d 2 99 "BH" 4.1d 2 100 "BI" 4.2d 1 999 "K=" 5.9w 1 1000 "K>" 6.0w 0 8463 "~~" 1.0y 0 8464 "BAA" 1.0y 1 9999 "BQ!" 1.1y 1 10000 "BQ#" 1.1y 0 99999 "L-`" 11.4y 0 100000 "L-{" 11.4y -1 778687 "~~~" 88.9y -1 778688 "BAAA" 88.9y 0 999999 "BaNz" 114.2y 0 1000000 "BaN0" 114.2y -1 9999999 "M;r7" 1141.6y -1