note 96202 deleted from function.substr by thiago

Note Submitter: Mario Wenzel ---- One has to note that substr() always returns false on an empty string. The line "If string is less than or equal to start characters long, FALSE will be returned." is a little bit misleading since start can be negative. substr('',-1) returns false as opposed to an empty string. For positive starts the documentation is consistent. I cannot stretch enough that substr() returns false on an empty string. The documentation does not state that explicitly. So if you're doing something like this: <?PHP function extract_numbers($input_text) { while (($char = substr($input_text, 0, 1)) !== false) { if (is_numeric($char)) { $result .= $char; } $input_text = substr_replace($input_text, '', 0 , 1); } return $result; } ?> be sure to check on false and not on an empty string