Online PHP editor | rfc for 9iW5Y

@ 2014-08-14T07:26:17Z

<?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) {
		$mid = round(($min+$max)/2, 0)-1;	
		$k = cmp($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));
	}
}

Output for git.master, git.master_jit, rfc.property-hooks: 1=>2 4=>2 9=>2 5=>2 6=>2 9=>2 7=>2 7=>2 9=>2 8=>2 8=>2 9=>2 100=>1 549=>1 999=>1 550=>1 774=>1 999=>1 775=>1 886=>1 999=>1 887=>1 942=>1 999=>1 943=>1 970=>1 999=>1 971=>1 984=>1 999=>1 985=>1 991=>1 999=>1 992=>1 995=>1 999=>1 996=>1 997=>1 999=>1 998=>1 998=>1 999=>1 10000=>0 54999=>0 99999=>0 55000=>0 77499=>0 99999=>0 77500=>0 88749=>0 99999=>0 88750=>0 94374=>0 99999=>0 94375=>0 97186=>0 99999=>0 97187=>0 98592=>0 99999=>0 98593=>0 99295=>0 99999=>0 99296=>0 99647=>0 99999=>0 99648=>0 99823=>0 99999=>0 99824=>0 99911=>0 99999=>0 99912=>0 99955=>0 99999=>0 99956=>0 99977=>0 99999=>0 99978=>0 99988=>0 99999=>0 99989=>0 99993=>0 99999=>0 99994=>0 99996=>0 99999=>0 99997=>0 99997=>0 99999=>0 99998=>0 99998=>0 99999=>0 1000000=>-1 5499999=>-1 9999999=>-1 5500000=>-1 7749999=>-1 9999999=>-1 7750000=>-1 8874999=>-1 9999999=>-1 8875000=>-1 9437499=>-1 9999999=>-1 9437500=>-1 9718749=>-1 9999999=>-1 9718750=>-1 9859374=>-1 9999999=>-1 9859375=>-1 9929686=>-1 9999999=>-1 9929687=>-1 9964842=>-1 9999999=>-1 9964843=>-1 9982420=>-1 9999999=>-1 9982421=>-1 9991209=>-1 9999999=>-1 9991210=>-1 9995604=>-1 9999999=>-1 9995605=>-1 9997801=>-1 9999999=>-1 9997802=>-1 9998900=>-1 9999999=>-1 9998901=>-1 9999449=>-1 9999999=>-1 9999450=>-1 9999724=>-1 9999999=>-1 9999725=>-1 9999861=>-1 9999999=>-1 9999862=>-1 9999930=>-1 9999999=>-1 9999931=>-1 9999964=>-1 9999999=>-1 9999965=>-1 9999981=>-1 9999999=>-1 9999982=>-1 9999990=>-1 9999999=>-1 9999991=>-1 9999994=>-1 9999999=>-1 9999995=>-1 9999996=>-1 9999999=>-1 9999997=>-1 9999997=>-1 9999999=>-1 9999998=>-1 9999998=>-1 9999999=>-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

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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
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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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