Il precaricamento di immagini é una pratica usata spesso in JavaScript.Il concetto é molto semplice: una volta che il resto della pagina é stato caricato, si carica nella cache del browser l’immagine all’insaputa dell’utente.In questo modo, quando serve, l’immagine puó essere visualizzata più velocemente, senza più dover attendere che sia caricata.In molte applicazioni, questa tecnica
An SQL injection attack is a form of hacking which attempts to obtain information about your server or DataBase setup by triggering errors in your form handling code.A hacker would fill in your form with a string that, if simply inserted in an SQL query, would prevent that query from working and, hopefully for the
One common application in web development is creating a contact form. The basic concept is very simple: you display a form, the user submits it and you send the submitted input to your self. There is, however, and inherent danger in this form: spammer bots may use it to send spam not only to you,
In this article I will illustrate a relatively simple PHP application, but which contains a couple of useful techniques: creating an automatic and dynamic banner. To keep it simple, it will simply be a series of images, but these techniques could really be used for anything at all. Nonetheless, it will include a couple of
Automatically replacing a URL with a link. This may be required when a form is submitted and an internet address (URL) is not automatically a hyperlink. The solution is to make use of a technique called ‘regular expressions’. Using a regular expression we can identify any URLs in the submitted content. We can then replace