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<?php function gdr_encode($val) { $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!='; $base = strlen($chars); $str = ''; while ($val > 0) { $str .= $chars[$val % $base]; $val = (int)($val / $base); } return $str; } function gdr_decode($str) { $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!='; $base = strlen($chars); $map = array(); for ($i=0; $i<$base; $i++) { $map[$chars[$i]] = $base; } $val = 0; for ($i=0; $i<strlen($str); $i++) { $val *= $base; $val += (int)$map[$str[$i]]; } return $val; } $vals = array(0, 1, 99, 100, 255, 256, 999, 1000, 9999, 10000, 65535, 65536, 99999, 100000, 999999, 1000000, 4294967295, 4294967296); foreach ($vals as $val) { $enc = json_encode(gdr_encode($val)); $dec = json_encode(gdr_decode($enc)); $val = json_encode($val); if (strlen($enc) > strlen($val)) { echo "$enc $val WORSE\n"; } else if (strlen($enc) == strlen($val)) { echo "$enc $val EQUAL\n"; } else { echo "$enc $val\n"; } }
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "" 0 WORSE Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "B" 1 WORSE Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "jB" 99 WORSE Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "kB" 100 WORSE Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "=D" 255 WORSE Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "AE" 256 WORSE Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "nP" 999 WORSE Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "oP" 1000 EQUAL Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "PcC" 9999 WORSE Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "QcC" 10000 EQUAL Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "==P" 65535 EQUAL Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "AAQ" 65536 EQUAL Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "faY" 99999 EQUAL Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "gaY" 100000 Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "=I0D" 999999 EQUAL Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "AJ0D" 1000000 Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "=====D" 4294967295 Warning: Undefined array key """ in /in/sE94c on line 24 Warning: Undefined array key """ in /in/sE94c on line 24 "AAAAAE" 4294967296

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