One of the most difficult parts of building a WordPress theme is providing ways for users with different requirements to customize it. It’s just like customizing a family van by adding an extra seat or a roof rack. Similarly, WordPress offers four interesting methods to prepare a theme for extensibility—filters, action hooks, pluggable functions, and child themes—and each one adds possibilities to the mix.
Filters allow the user admin to alter the way content is output, either by prepending or appending extra content, or by completely overwriting it with different content. For example, you can use plugins to add social-sharing buttons at the beginning or end of the post. In other words, ...
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