{"id":4227,"date":"2022-08-22T00:38:21","date_gmt":"2022-08-21T19:08:21","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-clarification-on-filters-and-hooks\/"},"modified":"2022-08-22T00:38:21","modified_gmt":"2022-08-21T19:08:21","slug":"solved-clarification-on-filters-and-hooks","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-clarification-on-filters-and-hooks\/","title":{"rendered":"[Solved] Clarification on filters and hooks"},"content":{"rendered":"

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I am confused because add_filter uses the word add when I feel like it
\n is more on the lines of replace or overwrite (unless I am
\n misunderstanding)<\/p>\n<\/blockquote>\n

You are misunderstanding. Both add_action<\/code> and add_filter<\/code> insert function callbacks into a kind of queue. You can add many callbacks to the same hook and they will fire in the sequence added except when a priority is included as the third parameter.<\/p>\n

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So in this situation is the apply_filter just creating a dynamic
\n method on the fly and making it return the chicken string?<\/p>\n<\/blockquote>\n

apply_filters<\/code> — note the ‘s’– does more or less create the filter but usually it is passed a variable not a string and that variable is passed to the callback which then alters it and returns it.<\/p>\n

Filter ‘slugs’ are not the names of WordPress Core functions or methods as a rule though some functions have filters of the same name. For example, the_content()<\/code> calls the the_content<\/code> filter. <\/p>\n

Hooks do not usually override whole function, only parts of them, but there are exceptions and near exceptions.<\/p>\n

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Also, can you only apply_filter something that you’ve add_filtered ?<\/p>\n<\/blockquote>\n

No. The other way around. You can only add_filter<\/code> something that is apply_filter<\/code>ed. You can use add_filter('whatever','abc');<\/code> but nothing at all will happen if there is not an apply_filter('whatever',...<\/code> somewhere.<\/p>\n

Pretty much the same applies to add_action<\/code>\/do_action<\/code> but actions are for doing things rather than returning values.<\/p>\n

Hooks are executed at various times in the page load and at various places in functions and methods. For example, save_post<\/code> executes near the end of wp_insert_post<\/code><\/a> while pre_get_posts<\/code> executes near the top of the get_posts<\/code><\/a> method of the WP_Query<\/code> class. Others execute in the middle of the page load<\/a> and not in a function or method at all. They execute where ever there is a need (as determined by the developers) to either alter or add information, or run other functions, redirect a page, etc.<\/p>\n

More Information<\/h1>\n

Difference Between Filter and Action Hooks?<\/p>\n<\/p><\/div>\n

<\/div>\n<\/div>\n

2<\/span> <\/p><\/div>\n<\/div>\n

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solved Clarification on filters and hooks <\/p>\n","protected":false},"excerpt":{"rendered":"

[ad_1] I am confused because add_filter uses the word add when I feel like it is more on the lines of replace or overwrite (unless I am misunderstanding) You are misunderstanding. Both add_action and add_filter insert function callbacks into a kind of queue. You can add many callbacks to the same hook and they will … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[627],"tags":[706,705,690],"class_list":["post-4227","post","type-post","status-publish","format-standard","hentry","category-wordpress","tag-core","tag-filters","tag-hooks"],"yoast_head":"\n[Solved] Clarification on filters and hooks - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-clarification-on-filters-and-hooks\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Clarification on filters and hooks - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] I am confused because add_filter uses the word add when I feel like it is more on the lines of replace or overwrite (unless I am misunderstanding) You are misunderstanding. 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