3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?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"; }
based on JieUt
Output for 7.0.0 - 7.1.0
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 - 5.6.28, hhvm-3.10.0 - 3.12.0
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 - 4.4.4
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