Online PHP editor | rfc for YG4ht

@ 2014-08-13T22:40:36Z

<?php

function pack_encode($format, $val) {
	$b64 = base64_encode(pack($format, $val));
	return str_replace(array('/', '='), array('_', ''), $b64); // "/" json-encodes poorly and "=" is padding
}

function pack_decode($format, $width, $bin) {
	$b64 = str_replace('_', '/', $bin); // un-padded
	$data = unpack($format, base64_decode($b64, false));
	$val = 0;
	foreach ($data as $v) {
		$val = ($val<<$width) | $v;
	}
	return $val;
}

function pack_encode_uint16($val) {
	return pack_encode('n', $val);
}

function pack_decode_uint16($val) {
	return pack_decode('n', 16, $val);
}

function pack_encode_uint32($val) {
	return pack_encode('N', $val);
}

function pack_decode_uint32($val) {
	return pack_decode('N', 32, $val);
}

function pack_encode_uint64($val) {
	return pack_encode('NN', $val);
}

function pack_decode_uint64($val) {
	return pack_decode('NN', 32, $val);
}


$max = 32767;
$n = 20;
$step = intval($max/$n);

for ($i=0; $i<=$n; $i++) {
	$val = $i*$step;
	$enc16 = pack_encode_uint16($val);
	$enc32 = pack_encode_uint32($val);
	$enc64 = pack_encode_uint64($val);
	$str = base64_encode(strval($val)); // STUPID
	echo "$enc16 $enc32 $str $val";

	$dec16 = pack_decode_uint16($enc16);
	$dec32 = pack_decode_uint32($enc32);
	$dec64 = pack_decode_uint32($enc64);
	if ($dec16 != $val) {
 		echo " 16($dec16 != $val)";
	}if ($dec32 != $val) {
 		echo " 32($dec32 != $val)";
	} else if ($dec64 != $val) {
 		echo " 64($dec64 != $val)";
	}

	echo "\n";
}

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught ValueError: Type N: too few arguments in /in/YG4ht:4 Stack trace: #0 /in/YG4ht(4): pack('NN', 0) #1 /in/YG4ht(35): pack_encode('NN', 0) #2 /in/YG4ht(51): pack_encode_uint64(0) #3 {main} thrown in /in/YG4ht on line 4
Process exited with code 255.

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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