Why are my custom links not showing up?

The most frequent cause of missing links is an incorrect plugin path in the filter name. If your plugin folder is named my-plugin and the main file is core.php, your hook must be exactly plugin_action_links_my-plugin/core.php. Double-check your directory structure.

Why am I getting a fatal PHP error about array manipulation?

If you receive an error stating "array_unshift() expects parameter 1 to be array, null given," it means another plugin or a poorly written theme has returned null on this filter hook instead of an array. To fix this, always ensure your function checks if $links is an array before manipulating it.

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WordPress Plugin Action Links: Safely Add Them In 3 Simple Steps (2026 Guide)

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