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並前往https://www.semicolonworld.com/question/40265/warning-mysqli-num-rows-expects-parameter-1-to-be-mysqli-result-boolean-given-in-c-xampp-htdocs-midtermproject-signuppost-php

mysqli_num_rows() expects parameter 1 to be mysqli_result ...

Here is my code $res = mysqli_query($conn, "SELECT * FROM foodtography WHERE email = '$email'"); if(mysqli_num_rows($res) !=

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