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PEAR s Text_CAPTCHA package, freely available from http://pearphp net/package/Text_Captcha, takes all the hassle out of actually generating a CAPTCHA image As the first listing (captcha-generatorphp) illustrates, generating a CAPTCHA begins by initializing an instance of the Text_CAPTCHA class, and setting options such as the height and width of the image and the font file to use for the CAPTCHA string The getPhrase() method returns the solution of the CAPTCHA as a string, while the getCAPTCHAAsJPEG() method prints the CAPTCHA as a JPEG image (other image formats are also supported)
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Using this CAPTCHA in combination with a form is somewhat more involved
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1 The simple CAPTCHA generation script described previously (captcha-
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generatorphp) must be modified to store the CAPTCHA solution in a session variable This enables it to be used by other scripts operating in the context of the same user session For greater security, it s also possible to store an MD5 signature of the solution (rather than the solution itself), as the first listing does 2 It s necessary to modify the form (formphp) with some additional elements First, the CAPTCHA image itself must be displayed; this is accomplished by referencing captcha-generatorphp in an <img /> tag A text input field should also be added, to enable a user to input the CAPTCHA solution 3 The form processing script must create an MD5 signature of the user s input, and check this signature against that originally stored in the session by the captcha-generatorphp script If the signatures match, it may be assumed that a human solved the CAPTCHA, and form processing can continue If the signatures do not match, it could be for one of two possible reasons: (a) a human attempted to submit the form but was unable to solve the CAPTCHA; (b) the form was submitted by an automated script In either case, the appropriate response is to reject the form submission and offer the user the chance to resubmit with a different CAPTCHA and solution
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A CAPTCHA, or Completely Automated Public Turing test to tell Computers and Humans Apart, is a common challenge-response test used to identify if the entity at the other end of a connection is a human being or a computer On the Web, the typical form of a CAPTCHA is a distorted sequence of random alphanumeric characters, operating on the principle that a computer will be unable to see past the distortion, but a human, with greater powers of perception, will be able to correctly identify the sequence Such CAPTCHAs are typically attached to input forms on the Web (for example, user registration forms), and must be solved correctly before the input will be processed by the host application CAPTCHAs need not always be visual; audio CAPTCHAs are also possible, and are most appropriate for visuallyhandicapped users Read more about CAPTCHAs at http://enwikipediaorg/wiki/ Captcha
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8: Working with Forms, Sessions, and Cookies
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819 Storing and Retrieving Session Data
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Problem
You want to make one or more variables persistent across a client session
Solution
Use PHP s session_start() function to start a new session (or import a previous one), and register variables in the session by adding them to the $_SESSION associative array:
< php // start new session // or import previous session session_start(); // add session variables $_SESSION['type'] = "Porsche Boxster"; $_SESSION['colors'] = array("black", "silver", "red"); print_r($_SESSION); >
Retrieve previously saved session variables by accessing the keys of the
$_SESSION associative array:
< php // start session session_start(); // check if session variables exist if (isset($_SESSION['type']) && isset($_SESSION['colors'])) { // do something with them echo "You would like a " $_SESSION['type'] " in " implode(" and ", $_SESSION['colors']); } >
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Comments
To start a session in PHP, use the session_start() function Once a session has been initialized, register session variables by adding them to the special $_SESSION associative array as key-value pairs In subsequent scripts, calling the session_ start() function re-creates the session environment by importing the contents of the $_SESSION associative array into the current symbol table You can then retrieve the values of previously registered session variables from the $_SESSION array, by key To delete session data, see the listing in 820: Deleting Session Data
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