note 110275 deleted from function.base-convert by danbrown

Note Submitter: espertalhao04 at hotmail dot com ---- holdoffhunger at gmail dot com you have created a great function, although it's really heavy and long. i have optimized TO ALMOST THE LIMIT your function: <?php function hex_bin($hex) { $bin=array("0000","0001","0010","0011","0100","0101","0110","0111", "1000","1001",'a'=>"1010",'b'=>"1011",'c'=>"1100",'d'=> "1101",'e'=>"1110",'f'=>"1111"); $c = strlen($hex=strtolower($hex)); for($i=0;$i<=$c;$i++) { @$o.=$bin[$hex[$i]]; } return $o; } echo hex_bin("1234567890aBcDeF"),PHP_EOL; /*returns EXACTLY 0001001000110100010101100111100010010000101010111100110111101111*/ ?> why i made this on this way: 1- smaller in disk space, smaller in memory, smaller in lines 2- less vars (7 against 4) and abused them to the limit! 3- the data doesn't need so many verifications, since it's already in memory, always available 4- less cpu usage: all those verifications hurt the performance sooo badly!!! it has to do 16 verifications per char, in worst case scenario (if everything is "fffff...") my version has to do 0 verifications and the value is already in memory!!! 5- footprint: when the function exits, everything is cleaned, which doesn't happen on your code, cause you didn't have it inside a function bla(){code} you could do this all in 1 line, 2 arrays and 1 var (i create a new function for simplicity and to do more and repeat less): <?php function hex_bin($hex) { str_replace( array("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"), array("0000","0001","0010","0011","0100","0101","0110","0111", "1000","1001","1010","1011","1100","1101","1110","1111") ,strtolower($hex)); } echo hex_bin("1234567890aBcDeF"),PHP_EOL; /*the output is EXACTLY THE SAME as in both versions: 0001001000110100010101100111100010010000101010111100110111101111*/ ?> or you could create your own regex with preg_replace(); this is just an idea!!! but you had a great idea, i made 2 improvements and gave another idea ;) if you ask me which variant to use, i would say the second, cause uses less vars and relies on 100% php internal optimized code. i didn't has tested the times but this is my opinion!