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You can use sanitize_title() function: $string = "This is title string"; // return "this-is-title-string" $slug = sanitize_title( $string ); You can also filter the result of sanitize_title() function using sanitize_title filter: add_filter( 'sanitize_title' , 'sanitize_filter_callback', 10, 3 ); function sanitize_filter_callback( $title, $raw_title, ...


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When you call register_setting, the third parameter is the sanitize callback function. You can do whatever data manipulation you need in that function, in order to arrange the user input into the format you need for your code. So after the data validation (integers are integers, sanitize text fields, etc.), you can retrieve the current option value and add ...



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