What is the purpose of using the `open()` and `close()` methods within an interface in PHP?

The purpose of using the `open()` and `close()` methods within an interface in PHP is to define a contract that classes implementing the interface must follow. By including these methods in the interface, we ensure that any class that implements the interface will have these methods available for use. This helps in standardizing the behavior of classes that share the same interface. 

<?php
// Define an interface with open() and close() methods
interface FileInterface {
    public function open();
    public function close();
}

// Implement the FileInterface in a class
class File implements FileInterface {
    public function open() {
        // Open file implementation
        echo "File opened.";
    }

    public function close() {
        // Close file implementation
        echo "File closed.";
    }
}

// Create an instance of the File class
$file = new File();
$file->open();
$file->close();
?>

Keywords

open() close() methods interface PHP

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