The ways to write PHP statements are: 1. Embedded mode, embed PHP code in the HTML file; 2. Independent file mode, save the PHP code to an independent .php file; 3. Function mode , by writing custom functions, a series of related PHP codes can be encapsulated into one function to facilitate reuse and maintenance; 4. Class and object method, by writing classes and objects, more complex functions can be achieved, and the code can be organized and management more flexible.
The operating environment of this tutorial: Windows 10 system, PHP8.1.3 version, Dell G3 computer.
There are many ways to write PHP statements. The following will introduce some commonly used ways of writing PHP statements.
1. Embedded method:
The most common way is to embed PHP code in the HTML file. Use the embedded method to include both HTML and PHP code in one file. In HTML files, special tags can be used to identify the beginning and end of PHP code. For example:
```html <html> <body> <h1><?php echo "Hello, World!"; ?></h1> </body> </html> ```
In the above example, the `` tag is used to contain PHP code, and a piece of text is output using the `echo` statement.
2. Independent file method:
Another common method is to save the PHP code into a separate .php file and then include it Or use it in other files by introducing (require). This approach makes the code logic clearer and enables efficient code reuse. For example, the following code can be stored in the `hello.php` file:
```php <?php echo "Hello, World!"; ?> ``` 然后，在其他文件中通过包含的方式使用这段代码： ```php <?php include "hello.php"; ?> ```
The ways to include a piece of code include `include`, `require`, `include_once` and `require_once`, choose the appropriate one according to the specific needs The way.
3. Function mode:
PHP provides a wealth of built-in functions for developers to use. By writing custom functions, a series of related PHP codes can be encapsulated into one function for easy reuse and maintenance. For example:
```php
<?php
function sayHello() {
echo "Hello, World!";
}
sayHello(); // 调用函数输出结果
?>
```4. Class and object methods:
PHP is an object-oriented language that supports the concepts of classes and objects. By writing classes and objects, more complex functions can be implemented, and the organization and management of code are more flexible. The following is a simple example of classes and objects:
```php
<?php
class Greeter {
public function sayHello() {
echo "Hello, World!";
}
}
// 创建对象并调用方法
$greeter = new Greeter();
$greeter->sayHello();
?>
```No matter which way you write PHP statements, you need to follow PHP's syntax rules and best practices. In addition, good coding style such as comments and indentation are also important factors in writing clear and readable PHP code.
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