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This is a very open-ended question. You’ll need code to handle adding the input to the database, but that warrants a separate question.<\/p>\n
For the PHP, you’ll need to decide how to validate each field, and then add another For date of birth, you should probably ensure that it’s a valid date. And then you may want to validate age as well.<\/p>\n You might use PHP code like this for birth date:<\/p>\n You could then use the following to format the date for MySQL:<\/p>\n Relevant PHP manual pages:<\/p>\n And you might use HTML code like this for birth date:<\/p>\n You could also format the input into separate fields for each part of the date and use drop down menus. I don’t find this is necessary since the The above should give you a good starting point. You can do something similar for each field. You need to show more personal effort<\/strong> if you expect people here to help.<\/p>\n If you have specific questions about how to validate the other inputs, you should post a separate question (after first searching for the answer). Show what you’ve tried. Describe the result and explain how it’s different from the expected result.<\/p>\n I’d combine the two Comparing the return value of You should use if<\/code> block for each question. For the HTML, you’ll need to add another input for each field.<\/p>\nExample Code<\/h2>\n
\/\/test date\ntry {\n $max_date = new DateTime('13 years ago');\n $birth_date = new DateTime($_POST['birth_date']);\n if ($birth_date > $max_date) { {\n $errors[] = 'You must be at least 13 years old.';\n }\n} catch (Exception $e) {\n $errors[] = 'Birth date is not a valid date.';\n}\n<\/code><\/pre>\n$birth_date->format('Y-m-d');\n<\/code><\/pre>\n\n
<h4>Birth Date:<\/h4>\n<input type=\"text\" name=\"birth_date\" value=\"<?php if (isset($_POST['birth_date'])) echo htmlentities($_POST['birth_date']); ?>\" \/>\n<\/code><\/pre>\nDateTime<\/code> class can handle a wide variety of formats. However, I usually add a jQuery Datepicker<\/a> to make it more user friendly.<\/p>\n
\nOther Fields<\/h2>\n
\nSuggestions for Code Improvement<\/h2>\n
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if<\/code> blocks for username. If the username already exists, you don’t need to validate the format.<\/p>\nif ($users->user_exists($_POST['username']) === true) {\n $errors[] = 'That username already exists';\n} else if (!ctype_alnum($_POST['username'])) {\n $errors[] = 'Please enter a username with only alphabets and numbers';\n}\n<\/code><\/pre>\n<\/li>\nempty($errors)<\/code> to true or false is redundant. The return value is always a boolean. You only need if (empty($errors))<\/code> or if (!empty($errors))<\/code>.<\/p>\n<\/li>\nlabel<\/code> elements in your HTML instead of h4<\/code> elements to make your HTML more semantic. You can then use CSS to style them however you want.<\/p>\n<label for=\"fld-password\">Password:<\/label>\n<input type=\"password\" id=\"fld-password\" name=\"password\" \/>\n<\/code><\/pre>\n<\/li>\n<\/ol>\n<\/div>\n