What is the difference between an action and a filter?

  • Actions are used to add custom functions and remove WordPress functions. Filters are used to make strings translatable for localization.
  • Actions are used to add or remove code at runtime. Filters are used to modify data before it is either displayed in the browser or saved to the database.
  • Actions are used to assign values to variables at runtime. Filters are used to extract data from actions and display it in the browser.
  • Actions are used to add user-inputted data to the database. Filters are used to validate user-inputted data prior to adding it to the database.
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