The Beginner's Guide to WordPress Actions and Filters - Tuts+ Code Article - 0 views
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Actions are events in the WordPress page lifecycle when certain things have occurred - certain resources are loaded, certain facilities are available, and, depending on how early the action has occurred, some things have yet to load.
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Filters are functions that WordPress passes data through during certain points of the page lifecycle. They are primarily responsible for intercepting, managing, and returning data
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For example, say you wanted to append a short sentence about the author at the end of the content. To do this, you'd register a custom function with the_content filter and append your sentence to the content.
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"Actions are events in the WordPress page lifecycle when certain things have occurred - certain resources are loaded, certain facilities are available, and, depending on how early the action has occurred, some things have yet to load."