How to Load PHP Form-Validation Errors on a Facebook Custom Tab Form
I recently built a PHP/MySQL-based sign-up form for a fan-gated page on Facebook. It tested perfectly when the page’s URL is accessed directly. However, when viewed and tested on Facebook (which places the page within an iFrame), the non-fan content is loaded whenever a validation error occurs, i.e., a required field isn’t filled in. So [...]












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