- var_dump: documentation ( source)
<?php
function bit2chr_mask(string $flags, int $bitmask): string
{
$chrmask = '';
for($bit = 1, $i = 0; $bit < $bitmask; $bit <<= 1, $i++)
{
if($bitmask & $bit){
$chrmask .= $flags[$i];
}
}
return $chrmask;
}
var_dump(bit2chr_mask('abcdefghijklmnopqrstuvwxyz1234567890', 2147483648));