摘要：correct way, when changing object, firstly you should create this object and then assign its property to the new object wrong way. don't assign one ob 阅读全文

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摘要：1. relative position do not remove a element for its parent normal flow. 2.absolute position will flaot the element above its parent flow 阅读全文

摘要：https://websitebeaver.com/prepared statements in php mysqli to prevent sql injection introduction One Row $result fetch_assoc() Fetch an associative a 阅读全文