Online PHP editor | output for dqIPm

@ 2014-08-13T22:37:07Z

<?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_encode_uint32($val) {
	return pack_encode('N', $val);
}

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

function pack_decode_uint32($val) {
	return pack_decode('N', 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);
	$str = base64_encode(strval($val)); // STUPID
	echo "$enc16 $enc32 $str $val";

	$dec16 = pack_decode_uint16($enc16);
	$dec32 = pack_decode_uint32($enc32);
	if ($dec16 != $val) {
 		echo " $dec16 != $val";
	} else if ($dec32 != $val) {
 		echo " $dec32 != $val";
	}
	echo "\n";
}

Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: AAA AAAAAA MA== 0 Fatal error: Uncaught Error: Call to undefined function unpack() in /in/dqIPm:10 Stack trace: #0 /in/dqIPm(27): pack_decode('n', 16, 'AAA') #1 /in/dqIPm(45): pack_decode_uint16('AAA') #2 {main} thrown in /in/dqIPm on line 10
Process exited with code 255.
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 AAA AAAAAA MA== 0 Fatal error: Uncaught Error: Call to undefined function unpack() in /in/dqIPm:10 Stack trace: #0 /in/dqIPm(27): pack_decode('n', 16, 'AAA') #1 /in/dqIPm(45): pack_decode_uint16('AAA') #2 {main} thrown in /in/dqIPm on line 10
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38: AAA AAAAAA MA== 0 Fatal error: Call to undefined function unpack() in /in/dqIPm on line 10
Process exited with code 255.
Output for 4.4.5 - 4.4.9: AAA AAAAAA MA== 0 Fatal error: Call to undefined function: unpack() in /in/dqIPm on line 10
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4: AAA AAAAAA MA== 0 Fatal error: Call to undefined function: unpack() in /in/dqIPm on line 10
Process exited with code 255.
Output for 4.3.0 - 4.3.1: AAA AAAAAA MA== 0 Fatal error: Call to undefined function: unpack() in /in/dqIPm on line 10

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