Question

How to get the 4 least significant bits in a byte with PHP

Answer 1

$value = 0xD6;          // 214 decimal
$lower4 = $value & 0x0F; // 6 decimal

echo "value  (dec): $value\n";
echo "lower4 (dec): $lower4\n";

echo "value  (bin):  " . str_pad(decbin($value), 8, "0", STR_PAD_LEFT) . "\n";
echo "lower4 (bin):  " . str_pad(decbin($lower4), 4, "0", STR_PAD_LEFT) . "\n";




/*
run:

value  (dec): 214
lower4 (dec): 6
value  (bin):  11010110
lower4 (bin):  0110

*/

 

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