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I would like to call a function when a I save a setting/option in a custom admin page.

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    Can you update your question with more details, such as which setting you're referring to, how you're adding it, etc
    – Tom J Nowell
    Jun 20, 2017 at 7:02

3 Answers 3

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Every function hooked to admin_init will be called after you save settings in the admin page. You should add some extra check of conditions to trigger your code on correct page. For example:

is this the setting page? is set $_REQUEST with values from options page etc...

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  • You're right. When save settings the function hooked is called. Thanks a lot !! Jun 20, 2017 at 8:33
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When save settings the function hooked is called. The solution is check in this function this:

// check if the user have submitted the settings
 // wordpress will add the "settings-updated" $_GET parameter to the url
 if ( isset( $_GET['settings-updated'] ) ) {
   // add the function called
   your_function();
 }
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Hook into save_post ( https://developer.wordpress.org/reference/hooks/save_post/ ).

Within your function, to see if you're working with the option page you want, use get_current_screen() ( https://developer.wordpress.org/reference/functions/get_current_screen/ ).

You can then look through the $_POST/$_GET variables you're receiving.

Don't forget to use a nonce and filter the incoming values! ☝

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