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问PHP,MySQL请问这两行代码有什么区别？

提问于 2017-11-29 11:36:35

回答 2关注 0查看 499

请问这两行代码有什么区别？我试了一下都可以运行成功。

 $query = "insert into books values (' ".$isbn." ', ' ".$author." ', ' ".$title." ', ' ".$price." ')";

$query = "insert into books values (' $isbn ', ' $author ', ' $title', ' $price ')";`

完整代码from PHP和MySQL Web开发(原书第4版)：

 <html>

    <head>

        <title>TODO supply a title</title>

        <meta charset="UTF-8">

        <meta name="viewport" content="width=device-width, initial-scale=1.0">

    </head>

    <body>

        <h1>Book-O-Rama Book Entry Result</h1>

        <?php

        //create short variable names

        $isbn=$_POST['isbn'];

        $author=$_POST['author'];

        $title=$_POST['title'];

        $price=$_POST['price'];

        if (!$isbn || !$author || !$title || !$price){

            echo "You have not entered all the required details. <br />". "Please go back and try again";

            exit;

        if (!get_magic_quotes_gpc()){

            $isbn = addslashes($isbn);

            $author = addslashes($author);

            $title = addslashes($title);

            $price = doubleval($price);

        @ $db = new mysqli('localhost', 'root', '123', 'mydb');

        if (mysqli_connect_errno()){

            echo "Error: Could not connect to database. Please try again later.";

            exit;

        $query = "insert into books values (' ".$isbn." ', ' ".$author." ', ' ".$title." ', ' ".$price." ')";

        $result = $db->query($query);

        if ($result) {

            echo $db->affected_rows. "book inserted into database.";

        }  else {

                echo "An error has occurred. The item was not added.";

        $db->close();

?>

    </body>

</html>

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