In PHP, include can insert the contents of external files into the current script. It facilitates modular code, code reuse, and lazy loading, but can also lead to file loss, performance overhead, and namespace conflicts.
The role of include in PHP
The include in PHP is used to include the contents of external files into the current script middle. It is a preprocessor directive that is processed by the PHP parser before the script is executed.
Principle of operation
When include is used, the PHP parser will read the contents of the external file and insert it into the location specified in the current script. Functions, classes, and other code defined in the included file are executed as part of the current script.
Usage
The syntax for using include is as follows:
<code class="php">include("filename.php");</code>
Where "filename.php" is the relative path or absolute path of the external file to be included path.
Advantages
The advantages of using include include:
Disadvantages
The disadvantages of using include include:
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