The Secure Hash Algorithm (SHA) family is a collection of related cryptographic hash features designed by the US National Security Agency and published by the US National Institute of Standards and Technology. The purpose of these algorithms is to calculate a shortened version of a set of characters, a "summary" which is highly unique to a given string, the "message".
Source: Wikipedia
<?php $text = 'This is a text'; $sha1 = sha1($text); // $sha1 now contains string 'a1a8d5a209038469ba57d5505bfb8e1ff68a8c3b'
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