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Header tags have their own place on a page and have to be used in a proper order starting with your h1. The h1 tag should contain your targeted keywords, ones that closely relate to the page title and are relevant to your content. The h2 tag is a subheading and should contain similar keywords to your h1 tag.
Definition and Usage. The sha1() function calculates the SHA-1 hash of a string. The sha1() function uses the US Secure Hash Algorithm 1. From RFC 3174 - The US Secure Hash Algorithm 1: SHA-1 produces a 160-bit output called a message digest.The message digest can then, for example, be input to a signature algorithm which generates or verifies the signature for the message.he sha1() function calculates the SHA-1 hash of a string.