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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; $len = cmp($min); if ($len == cmp($max)) { return; } while ($min < $max) { $mid = round(($min+$max)/2, 0)-1; $k = cmp($mid); echo "$min $mid $max $k\n"; if ($k == $len && cmp($mid+1) == $len+1) { $vals[] = $mid; $vals[] = $mid+1; return; } if ($k <= $len) { $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 Q1FXa
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
10 54 99 1 10 31 53 1 10 19 30 1 10 13 18 1 10 10 12 1 1000 5499 9999 0 1000 3248 5498 0 1000 2123 3247 0 1000 1560 2122 0 1000 1279 1559 0 1000 1138 1278 0 1000 1068 1137 0 1000 1033 1067 0 1000 1015 1032 0 1000 1006 1014 0 1000 1002 1005 0 1000 1000 1001 0 100000 549999 999999 -1 100000 324998 549998 -1 100000 212498 324997 -1 100000 156248 212497 -1 100000 128123 156247 -1 100000 114060 128122 -1 100000 107029 114059 -1 100000 103513 107028 -1 100000 101755 103512 -1 100000 100876 101754 -1 100000 100437 100875 -1 100000 100217 100436 -1 100000 100107 100216 -1 100000 100052 100106 -1 100000 100025 100051 -1 100000 100011 100024 -1 100000 100004 100010 -1 100000 100001 100003 -1 num str time cmp 0 "" 0h 1 1 "B" 1h 2 9 "J" 9h 2 10 "K" 10h 1 99 "BH" 4.1d 2 100 "BI" 4.2d 1 999 "K=" 5.9w 1 1000 "K>" 6.0w 0 9999 "BQ!" 1.1y 1 10000 "BQ#" 1.1y 0 99999 "L-`" 11.4y 0 100000 "L-{" 11.4y -1 999999 "BaNz" 114.2y 0 1000000 "BaN0" 114.2y -1 9999999 "M;r7" 1141.6y -1