3v4l.org

run code in 300+ PHP versions simultaneously
<?php function pack_encode($val) { $str = ''; while ($val > 0) { $str .= chr($val & 0xFF); $val = $val >> 8; } // "/" json-encodes poorly and "=" is padding return str_replace( array('/', '='), array('_', ''), base64_encode($str) ); } for ($i=0; $i<32; $i++) { echo pack_encode($i) . "\n"; } /* $arr = array(); $packed = pack('N', 32767); for ($i=0; $i<strlen($packed); $i++) { $arr[$i] = ord($packed[$i]); } print_r($arr); function pack_encode($val) { $b64 = base64_encode(pack($format, $val)); return str_replace(array('/', '='), array('_', ''), $b64); // "/" json-encodes poorly and "=" is padding } function pack_decode($bin) { $b64 = str_replace('_', '/', $bin); // un-padded $data = unpack('C'.(length($bin)/2), base64_decode($b64, false)); $val = 0; foreach ($data as $v) { $val = ($val<<$width) | $v; } return $val; } $max = 32767; $n = 20; $step = intval($max/$n); for ($i=0; $i<=$n; $i++) { $val = $i*$step; $enc = pack_encode($val); $dec = pack_decode($val); echo "$enc $dec $val\n"; } */
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 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 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.2.17, 8.3.0 - 8.3.4
AQ Ag Aw BA BQ Bg Bw CA CQ Cg Cw DA DQ Dg Dw EA EQ Eg Ew FA FQ Fg Fw GA GQ Gg Gw HA HQ Hg Hw

preferences:
316.26 ms | 405 KiB | 455 Q