How and When to Use Actions and Filters

| Last Updated: | In: Wordpress, WP Labs


WordPress allows developers to add their own code during the execution of a request by providing various hooks. These hooks come in the form of actions and filters:

Actions: WordPress invokes actions at certain points during the execution request and when certain events occur.

Filters: WordPress uses filters to modify text before adding it to the database and before displaying it on-screen.

action-filters

The number of actions and filters is quite large, so we can’t get into them all here, but let’s at least take a look at how they are used.

Here’s an example of how to use the admin_print_styles action, which allows you to add your own stylesheets to the WordPress admin pages:

And here’s how you would use the the_content filter to add a “Follow me on Twitter!” link to the bottom of every post:

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About: Prem Tiwari

Prem Tiwari is founder of freewebmentor.com and Software developer from New Delhi (India). Follow Prem's development codes on facebook, and make sure you check out freewebmentor.com for the latest in web development related Tips with the complete code.


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