- str_replace: documentation ( source)
- base64_encode: documentation ( source)
- pack: documentation ( source)
- json_encode: documentation ( source)
<?php
function pack_decode($format, $val) {
}
function pack_encode($format, $val) {
$base64 = base64_encode(pack($format, $val));
return str_replace(array('/', '='), array('_', ''), $base64);
}
function pack_encode_uint16($val) {
return pack_encode('S', $val);
}
function pack_encode_uint32($val) {
return pack_encode('S', $val);
}
$max = 32767;
$n = 20;
$step = intval($max/$n);
for ($i=0; $i<=$n; $i++) {
$val = $i*$step;
$uint16 = pack_encode_uint16($val);
$uint32 = pack_encode_uint32($val);
$str = base64_encode(strval($val));
echo json_encode("$uint16 $uint32 $str $val") . "\n";
}