Discussion on PHP programming technology in Typecho

Discussion on PHP programming technology in Typecho

Introduction:
Typecho is a simple and efficient PHP blog engine, which is lightweight and easy to expand. This article mainly discusses PHP programming technology in Typecho, including commonly used PHP functions, database operations, file reading and writing, form processing, etc. And through code examples, it shows how to implement common functions in Typecho.

1. Application of PHP functions

1. String processing
   String processing is one of the commonly used operations in PHP programming. In Typecho, we can use the following functions to implement various string processing needs.

// String interception
$str = "Hello, PHP!";
$newStr = substr($str, 0, 5);
echo $newStr; // Output: Hello

// String replacement
$str = "Hello,PHP!";
$newStr = str_replace("PHP", "Typecho", $str);
echo $newStr; // Output: Hello, Typecho!

2. Array operation
   Array is a common data structure in PHP programming and one of the data types frequently used in Typecho.

// Array traversal
$fruits = array("apple", "banana", "orange");
foreach ($fruits as $fruit) {
echo $fruit;
}
// Output: applebananaorange

// Determine whether the element is in the array
$fruits = array("apple", "banana", "orange");
if (in_array("apple", $fruits)) {
echo "Apple exists";
}
// Output: Apple exists

2. Database operation
Typecho uses MySQL as the backend database to store data. We can use PHP's database operation functions to implement addition, deletion, modification, and query operations on the database.

//Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
$conn = mysqli_connect($servername, $username, $password, $dbname);

// Insert data
$sql = "INSERT INTO users (username, password) VALUES ('admin ', '123456')";
if (mysqli_query($conn, $sql)) {

echo "数据插入成功";

}

// Query data
$sql = "SELECT id , username, password FROM users";
$result = mysqli_query($conn, $sql);
if (mysqli_num_rows($result) > 0) {

while($row = mysqli_fetch_assoc($result)) {
    echo "id: " . $row["id"]. " - Name: " . $row["username"]. " - Password: " . $row["password"]. "<br>";
}

}

3. File reading and writing
In Typecho, we can use PHP's file reading and writing functions to read and write files.

//File reading
$file = fopen("test.txt", "r");
if ($file) {

while (($line = fgets($file)) !== false) {
    echo $line;
}
fclose($file);

}

// File writing
$file = fopen("test.txt", "w");
if ($file) {

fwrite($file, "Hello, Typecho!");
fclose($file);

}

4. Form processing
In Typecho, form processing is a very important function. Below is a simple form processing example.

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<input type="text" name="username" placeholder="用户名">
<input type="password" name="password" placeholder="密码">
<input type="submit" value="提交">

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Conclusion:
The above are some examples of PHP programming technology discussion in Typecho, I hope it will be helpful to everyone in the development and use of Typecho. Of course, PHP programming technology goes far beyond this. We can also delve into PHP's object-oriented programming, full-site encryption, performance optimization, etc. to improve Typecho's development efficiency and experience.

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