English
English
In PHP, an interface is a structure that defines the method signature that a class must implement. It helps us to normalize and decouple code, and improve the maintainability and scalability of code. When we use interfaces in large projects, how to quickly understand which interfaces are in the current code environment is a common problem. Fortunately, PHP provides a very convenient built-in function - get_declared_interfaces() , which can help us easily view all declared interfaces.
Interfaces are an abstract type in the PHP language that defines a set of methods but do not contain specific implementations of methods. A class that implements an interface must implement all methods declared in the interface. This mechanism allows different classes to follow the same interface specification, ensuring that they have the same method structure.
<?php
interface LoggerInterface {
public function log(string $message);
}
class FileLogger implements LoggerInterface {
public function log(string $message) {
echo "Logging message to a file: $message";
}
}
?>
get_declared_interfaces() is a built-in function that returns a list of all currently declared interface names. It does not require any parameters, returns an array containing the names of all interfaces.
This function is very suitable for debugging, automatic document generation, or dynamically analyzing code structures.
Here is a simple example showing how to use get_declared_interfaces() to get the names of all interfaces in the current environment.
<?php
// Declare an interface
interface SampleInterface {
public function sampleMethod();
}
// Get all declared interfaces
$interfaces = get_declared_interfaces();
echo "The currently declared interface has：\n";
print_r($interfaces);
?>
After running the above code, a list of SampleInterface and PHP built-in interfaces will be output.
If you want to further view the methods of an interface, you can use the ReflectionClass class in combination with PHP's reflection mechanism.
<?php
interface ExampleInterface {
public function foo();
public function bar($param);
}
$interfaces = get_declared_interfaces();
foreach ($interfaces as $interface) {
if ($interface === 'ExampleInterface') {
$reflection = new ReflectionClass($interface);
echo "interface $interface The method is：\n";
foreach ($reflection->getMethods() as $method) {
echo "- " . $method->getName() . "\n";
}
}
}
?>
The above code will output all method names defined by ExampleInterface .
Using get_declared_interfaces() , we can dynamically get the interface list at runtime, helping us understand the definition of interfaces in the program, making it easier to debug and maintain. Especially in large projects, when there are many interfaces, this function can quickly summarize interface information and save a lot of time for manual search.
