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need to store a database variable in a php variable


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i need to store a variable from database like if i have "copies" in one of my column in my database then i have to store a particular value for copies store it to $copies

here i want that i can store value of copies into $copies


$update_book="update book set copies=copies-1 where bookid='$bookid'";
            print "<html><body background=\"header.jpg\">
            <p>book successfully subtracted from database</p></body></html>";
            else {
            print "<html><body background=\"header.jpg\">
            <p>problem occured</p></body></html>";


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