PHP - antispam code with numbers and letters (CAPTCHA)

December 2016





On many sites, the forms are accompanied by an insert request to copy a randomly generated code.

Such a system called CAPTCHA, used to limit abusive automated mailings (SPAM).

The following sites offer free tools in PHP, to put such a system on its website:
  • CryptoPHP, Free, PHP> = 4.3.0. Available in plugins for WordPress, wpMu, Symfony and Guppy.
  • ReCaptcha, Free, operates Web Service (online)
  • WebSpamProtect, Fee, PHP, Perl, ASP or ASP.NET
  • WP Captcha Free Free shows no code to copy, it is based on a system of self-generated hash making it impossible to add automated comments
  • ProtectWebFormis an online service offering a captcha, coupled to an audio system (for blind persons)

Related :

This document entitled « PHP - antispam code with numbers and letters (CAPTCHA) » from CCM (ccm.net) is made available under the Creative Commons license. You can copy, modify copies of this page, under the conditions stipulated by the license, as this note appears clearly.