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In HTML, a file-select control is a component of a web form with which a user can select a local file. When the form is submitted (perhaps together with other form data), the file is uploaded to the web server. There, when the file arrives, some action usually takes place, such as saving the file on the web server.
A regular expression (shortened as regex or regexp), [1] sometimes referred to as rational expression, [2] [3] is a sequence of characters that specifies a match pattern in text. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation.
A PHP Ajax framework is able to deal with database, search data, and build pages or parts of page and publish the page or return data to the XMLHttpRequest object. Quicknet is an Ajax framework that provides secure data transmission, uses PHP on the server side; Sajax PHP framework with a lot of functions, easy to integrate functions yourself