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我有2個Mysql表（tbl_subjects和tbl_courses）。使用PHP預先從MySql DB中選擇多個選項
tbl_subjects
id | subject_name |
1 | english |
2 | maths |
3 | Physics |
tbl_courses
id | my_subjects |
1 | 1,3 |
HTML &爲多選列表PHP代碼
$sql_subjects = mysql_fetch_array(mysql_query("SELECT *