Captcha is a system, which is integrated in many websites for abstaining automatic servers from spamming or from signing up to an account. As a matter of fact, a Captcha is incorporated in a website for differentiating user from automated server. To a viewer a Captcha is an image, which displays a blurred text or a shaded text that he must type in a given box for singing up to an account or for submitting a form. This program or device is widely used by large number of website owners to fight against the mass attack of spamming. Captcha can be created by using sophisticated programming language but it is the PHP programming language, which is used extensively by web programmers, as it is less complicated.
“Completely Automated Public Turing test”, which is popularly known as “Captcha”, prevents an automated program from filling up an online form or from becoming an affiliate member of a website. A Captcha generates random images with dotted texts to make it difficult or sometimes to make it impossible for an automated spam server from executing a task.
First, a text is generated by programming language then that text is set in the background of an image. After that, that text is stored in database for future use. The vital stage comes next. In this stage, text and image are displayed to the viewers. A user must type the text, which is displayed in the screen, in a box to complete the task. Entered code is then checked with the stored text.
Though Captcha can be created in any programming language, it is advisable to opt for PHP. PHP is very simple and therefore it is very easy to learn and edit. Persons with Java script or C language background can attain mastery over this language within a very short span of time. Those who are thoroughly acquainted with Pearl can easily get the hang of this programming language.
Cost is a certainly a defining factor, which needs to get proper attention. Captcha can be created by using a sophisticated programming language but that means that one has to hire professionals and it will simply increase the overall product cost. Now no body wants to incur extra expenditure as the fear of global economic meltdown is looming viciously in the background. This is the reason why the popularity of PHP is gaining enormous popularity among website owners.
Apart from that, PHP can be used with other programming languages. It is absolutely flexible and this has given it added advantage over others. Besides that, PHP can be loaded into diverse types of server interfaces (such as AOL server, Apache, THTTPD etc) and database interfaces (such as Oracle, Informix, MySQL etc.). These are enough reasons why a person should opt for PHP programming language while creating a Captcha.
