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WordPress 3 Plugin Development Essentials by Everett Griffiths, Brian Bondari

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Filters

See the WordPress Codex "Filter" reference (http://goo.gl/1UX4U) for a more complete list.

In this book, we have used mostly actions to achieve our goals, but it can be necessary to filter data.

the_content

This is an important one. Triggered when the template file executes the_content() function (that is the tag).

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