Understand the PHP knowledge you need to master in the Dream Weaver System

DedeCMS (DedeCMS) is a well-known open source CMS system in China and is widely used in the field of website construction. To be proficient in the development of the Dreamweaver system, it is essential to understand the PHP programming language. This article will introduce the PHP knowledge that needs to be mastered in the development of the Dreamweaver system and provide specific code examples.

1. Basic knowledge of PHP

1. Variables: In PHP, variables are containers used to store data. In the development of the Dreamweaver system, we often need to use variables to store data taken from the database or data entered by the user. For example, here is an example of declaring a variable:

$name = 'John';

2. Array: An array is a data structure used to store multiple numeric values. In the DreamWeaver system, we often need to use arrays to store multiple pieces of data, such as article lists, menu items, etc. The following is an example of creating an array:

$fruit = array('apple', 'banana', 'orange');

3. Conditional statements: Conditional statements are used to execute different blocks of code based on different conditions. In the development of the Dreamweaver system, we often need to execute different logic based on user operations. The following is an example of a conditional statement:

$age = 20;
if($age < 18){
    echo '未成年';
} else {
    echo '已成年';
}

2. Interact with the database

1. Connect to the database: In the Dreamweaver system, we need to interact with the database, from the database Read data from or write data to the database. The following is an example of connecting to the database:

$servername = "localhost";
$username = "username";
$password = "password";

$conn = new mysqli($servername, $username, $password);
if ($conn->connect_error) {
    die("连接失败：" . $conn->connect_error);
}

2. Querying data: Reading data from the database usually requires the use of SQL statements. The following is an example of querying the database:

$sql = "SELECT * FROM articles";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "标题: " . $row["title"]. " - 内容: " . $row["content"]. "<br>";
    }
} else {
    echo "0 结果";
}

3. Combining with the Dreamweaver system

1. Obtain article content: In the development of the Dreamweaver system, we often need to obtain articles title, content and other information. The following is an example of obtaining article information:

$aid = 1;
$arc = $dsql->GetOne("SELECT * FROM dede_archives WHERE id='$aid'");
echo "标题：" . $arc['title'] . "<br>";
echo "内容：" . $arc['body'] . "<br>";

2. Output template: The DreamWeaver system uses a template engine to control page display. We can output the data taken from the database to in the template. The following is an example of an output template:

$smarty->assign('title', $arc['title']);
$smarty->assign('content', $arc['body']);
$smarty->display('article.tpl');

Through the above example code, we can see that in the development of the Dreamweaver system, the PHP knowledge that needs to be mastered mainly includes variables, arrays, conditional statements, and databases. interaction and integration with the dreamweaver system. Proficient in this knowledge will help us better develop the Dreamweaver system and achieve more functions and customization needs.

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