如何獲取以前查詢過的一行MySQL主鍵？

Question

$query_check_domain_exists = "SELECT * FROM schools where domain ='$email_domain'"; 
$result_check_domain_exists = mysqli_query($d_schools, $query_check_domain_exists); 
$school_ID_result = ? 

$ school_ID_result變量需要包含它剛剛查找的行的school_ID（主鍵）（只有一個）。

Answer 1

添加mysqli_fetch_assoc()然後得到數組school_ID：

$query_check_domain_exists = "SELECT * FROM schools where domain ='$email_domain'"; 
$result_check_domain_exists = mysqli_query($d_schools, $query_check_domain_exists); 
$row = mysqli_fetch_assoc($result); 
$school_ID_result = $row['school_ID'];