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並前往https://medium.com/the-metric/modern-wordpress-development-you-should-throw-an-exception-when-you-encounter-a-wp-error-81fb82275cbd

You should throw an exception when you encounter a WP_Error

so, you could check for an error with is_wp_error : $wordPressUserId = wp_insert_user($anArrayOfArguments, true);

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查詢 「Is_wp_error」的人也找了：

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  7. Wp_insert_post
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