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<?php $b = 0b1110; // binary number evaluates as 14 dec and that value assigned to $b var_dump($b);// 14 $hexy = base_convert("0b1110",2, 16);// intepret numeric string as binary number to convert to hex $hexd = base_convert( 1110, 2, 16); // literal binary needs to be w/o "0b" prefix or messes up! $hex = base_convert($b, 10, 16); // or convert 14 dec to hex var_dump($hexy,$hexd, $hex,$b); $r[0] = base_convert($hexy,16,2); $r[1] = base_convert($hexd,16,2); $r[2] = base_convert($hex,16,2); var_dump($r);