note 109155 added to function.base-convert

The function 'base_convert' looks like it would be perfect for converting a hexadecimal number to a binary number. That code should look like : <?php // Author: holdoffhunger@gmail.com $hexadecimal_number = "1234567890aBcDeF"; $binary_number = base_convert($hexadecimal_number, 16, 2); print($binary_number); ?> However, if the hexadecimal number is too large (more than ~40 characters), the result is always a string of zeros as the binary result. So, I wrote some simple code to specifically handle base conversion with Hexadecimal-to-Binary in PHP : <?php // Author: holdoffhunger@gmail.com // Example Hexadecimal // --------------------------------------------- $hexadecimal_number = "1234567890aBcDeF"; // Format Hexadecimal // --------------------------------------------- $hexadecimal_to_convert_to_binary_testable = strtolower($hexadecimal_number); // Get String Length of Hexadecimal // --------------------------------------------- $length_of_text_to_convert_to_binary = strlen($hexadecimal_number); // Initialize Result Variable // --------------------------------------------- $results_of_hexadecimal_to_binary_conversion = ""; // Parse Hexadecimal String // --------------------------------------------- for($i = 0; $i < $length_of_text_to_convert_to_binary; $i++) { $current_char_of_hexadecimal_for_conversion = $hexadecimal_to_convert_to_binary_testable[$i]; switch($current_char_of_hexadecimal_for_conversion) { case '0': $results_of_hexadecimal_to_binary_conversion .= "0000"; break; case '1': $results_of_hexadecimal_to_binary_conversion .= "0001"; break; case '2': $results_of_hexadecimal_to_binary_conversion .= "0010"; break; case '3': $results_of_hexadecimal_to_binary_conversion .= "0011"; break; case '4': $results_of_hexadecimal_to_binary_conversion .= "0100"; break; case '5': $results_of_hexadecimal_to_binary_conversion .= "0101"; break; case '6': $results_of_hexadecimal_to_binary_conversion .= "0110"; break; case '7': $results_of_hexadecimal_to_binary_conversion .= "0111"; break; case '8': $results_of_hexadecimal_to_binary_conversion .= "1000"; break; case '9': $results_of_hexadecimal_to_binary_conversion .= "1001"; break; case 'a': $results_of_hexadecimal_to_binary_conversion .= "1010"; break; case 'b': $results_of_hexadecimal_to_binary_conversion .= "1011"; break; case 'c': $results_of_hexadecimal_to_binary_conversion .= "1100"; break; case 'd': $results_of_hexadecimal_to_binary_conversion .= "1101"; break; case 'e': $results_of_hexadecimal_to_binary_conversion .= "1110"; break; case 'f': $results_of_hexadecimal_to_binary_conversion .= "1111"; break; } } // Print Results // --------------------------------------------- print($results_of_hexadecimal_to_binary_conversion); // Output: (linebreak doesn't appear in results) // 00010010001101000101011001111000 // 10010000101010111100110111101111 ?> ---- Server IP: 69.147.83.197 Probable Submitter: 68.9.137.178 ---- Manual Page -- http://www.php.net/manual/en/function.base-convert.php Edit -- https://master.php.net/note/edit/109155 Del: integrated -- https://master.php.net/note/delete/109155/integrated Del: useless -- https://master.php.net/note/delete/109155/useless Del: bad code -- https://master.php.net/note/delete/109155/bad+code Del: spam -- https://master.php.net/note/delete/109155/spam Del: non-english -- https://master.php.net/note/delete/109155/non-english Del: in docs -- https://master.php.net/note/delete/109155/in+docs Del: other reasons-- https://master.php.net/note/delete/109155 Reject -- https://master.php.net/note/reject/109155 Search -- https://master.php.net/manage/user-notes.php