Online PHP editor | rfc for etGYa

@ 2014-08-14T07:38:02Z

<?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;
	$cmp_min = cmp($min);
	$cmp_max = cmp($max);
	if ($cmp_min === $cmp_max) {
		return;
	}
	if ($cmp_min+1 !== $cmp_max) {
		echo "BAD SEARCH ASSUMPTION: [$min => $cmp_min, $max => $cmp_max]\n";
	}
	while ($min <= $max) {
		$mid = (int)(($min+$max)/2);	
		$cmp_mid = cmp($mid);
		echo "$min=>$cmp_min $mid=>$cmp_mid $max=>$cmp_max\n";
    	if ($cmp_min === $cmp_mid && $cmp_mid !== cmp($mid+1)) {
			$vals[] = $mid;
			$vals[] = $mid+1;
			return;
	    }
		if ($min === $max) {
			return;
		}
		if ($cmp_min < $cmp_mid) {
			$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);

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($val), cmp($val));
	}
}

Output for git.master, git.master_jit, rfc.property-hooks: 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

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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
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
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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