Why WordPress plugins break on core updates and how to build ones that last
Many custom WordPress plugins fail not because core changes too quickly, but because of early design choices such as placing functionality in the theme or editing core files. The article argues that a plugin survives core updates when its code lives in a plugin, extends WordPress through actions and filters, stores data in structures matching its shape, and is tested against every release candidate. Putting custom code in a theme's functions.php is criticised because switching or redesigning themes silently disables post types, shortcodes and integrations. Developers are advised to use hooks instead of editing core, plugin, or wp-admin files, since such edits are erased by the next update. The piece also warns that the cost of this shortcut often appears later as expensive redesign work.
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