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The Plug-in
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function PIPHP_CheckCaptcha($captcha, $token, $salt1, $salt2) { return $token == md5("$salt1$captcha$salt2"); }
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Processing user input takes a lot of work, especially when you need data to be in a certain format or to fit within various constraints Using this plug-in you can check user input to ensure it is the right length and contains the right types of data, whether alphabetical, numeric, or something else It s also highly versatile, allowing you to specify the allowed characters (and therefore those that are disallowed), as well as types of characters that must be used Figure 6-5 shows two different strings being validated
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About the Plug-in
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This plug-in accepts a string to be validated, along with parameters describing what is and isn t allowed in the string The function returns a two-element array on failure The first of which is the value FALSE; the second is an array of error messages On success, it returns a single element with the value TRUE It takes these arguments: $text The text to be validated $minlength The minimum acceptable length $maxlength The maximum acceptable length
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FIGURE 6-5
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Processing form input is now easier than ever using this plug-in
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$allowed The characters that are allowed in the text Any characters can be entered here, including ranges indicated by using a - character, such as a-zA-Z $required Types of characters of which at least one of each must be in the text, out of a, l, u, d, w, and p which, in order, stand for any letter, lowercase, uppercase, digit, word (any letter or number), or punctuation
Variables, Arrays, and Functions
$len $error $result $caught $plural $j Integer containing the length of $text Array of all error message strings Integer result of matching the $allowed characters String containing matched characters from $allowed String with the value is , or s are if there is more than one match Loop counter
How It Works
This plug-in sets the value of $len to the length of $text, and after initializing the array $error ready to hold any error messages, it checks whether $len is smaller or larger than the required minimum and maximum lengths If either is the case, a suitable error message is added to the $error array Next the preg_match_all() function is called to check for the existence of any characters not in the string $allowed, which contains a list of all allowed characters, including supporting ranges created using the - character Thus, instead of having to use the string abcde, the equivalent of a-e is allowed; so, for example, to accept all upper- and lowercase letters, the string a-zA-Z could be used
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Those characters that do not match are placed in the array $matches by the function, and from there are placed in the string $caught, separated by a comma/space pair so that they can be added to an error message The string variable $plural is then assigned the value is if there is a single match, or s are if there is more than one This is then used when constructing the error message so that it reads grammatically, using one or other of the forms (the value of $plural is shown in bold): The following character is not allowed ; The following characters are not allowed Then, a for loop is entered for iterating through all the characters in the variable $required, which can contain any or all of the letters a, l, u, d, w, or p, which stand for any letter, lowercase, uppercase, digit, word (any letter or number), or punctuation Depending on which letter is being processed, the variable $regex is assigned the correct value to enable the following preg_match() call to ensure that at least one of that character type is included in the string This feature is very useful in cases where a certain type of input is required such as a number, or maybe a password that must have at least one each of a letter, number, and punctuation character As the variable s name indicates, all characters in $required must exist in the string being validated Therefore if any one of the types of characters described by $required is not encountered, another error message is added to the $error array Finally, if $error has no messages in it, then no errors were encountered, so a singleelement array containing the value TRUE is returned Otherwise, a two-element array is returned, the first of which is the value FALSE, and the second is the array of error messages
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