(PHP 5 >= 5.1.2, PHP 7)
ReflectionClass::hasMethod — 检查方法是否已定义
$name
) : bool检查一个类中指定的方法是否已定义。
name要检查的方法的名称。
如果有这个方法返回 TRUE，否则返回 FALSE。
Example #1 ReflectionClass::hasMethod() 例子
<?php
Class C {
public function publicFoo() {
return true;
}
protected function protectedFoo() {
return true;
}
private function privateFoo() {
return true;
}
static function staticFoo() {
return true;
}
}
$rc = new ReflectionClass("C");
var_dump($rc->hasMethod('publicFoo'));
var_dump($rc->hasMethod('protectedFoo'));
var_dump($rc->hasMethod('privateFoo'));
var_dump($rc->hasMethod('staticFoo'));
// C should not have method bar
var_dump($rc->hasMethod('bar'));
// Method names are case insensitive
var_dump($rc->hasMethod('PUBLICfOO'));
?>
以上例程会输出：
bool(true) bool(true) bool(true) bool(true) bool(false) bool(true)
Trait methods can be seen by both actual and alias names
<?php
trait Sauce
{
public function getSpicy()
{
return 'Cayenne';
}
}
class Sandwich
{
use Sauce {
Sauce::getSpicy as getSweet;
}
}
$class = new \ReflectionClass('Sandwich');
var_dump($class->hasMethod('getSweet'));
var_dump($class->hasMethod('getSpicy'));
?>
bool(true)
bool(true)
It might be interesting to know that this is the only method to determine if a trait has a specific method:
trait a{
function __wakeup(){}
}
class b{}
class c{
use a;
}
var_dump((new ReflectionClass('a'))->hasMethod('__wakeup')); // true
var_dump((new ReflectionClass('b'))->hasMethod('__wakeup')); // false
var_dump((new ReflectionClass('c'))->hasMethod('__wakeup')); // true
Annotated methods that are implemented using PHP magic methods are not recognized by "hasMethod".
<?php
/**
* @method void annotatedMethod()
*/
class SomeClass
{
public function __call($name, $arguments)
{
echo "this is magic method: $name.\n";
}
public function codedMethod()
{
echo "this is coded method.\n";
}
}
$obj = new \SomeClass();
$obj->codedMethod();
$obj->annotatedMethod();
$ref = new ReflectionClass(\SomeClass::class);
echo "SomeClass has 'codedMethod': " . json_encode($ref->hasMethod('codedMethod')) . ".\n";
echo "SomeClass has 'annotatedMethod': " . json_encode($ref->hasMethod('annotatedMethod')) . ".\n";
?>
Output:
this is coded method.
this is magic method: annotatedMethod.
SomeClass has 'codedMethod': true.
SomeClass has 'annotatedMethod': false.
A way to check if you can call an method over a class:
<?php
function is_public_method(
/* string */$className,
/* string */$method
){
$classInstance = new ReflectionClass($className);
if ($classInstance->hasMethod($method)) {
return false;
}
$methodInstance = $instance->getMethod($method);
return $methodInstance->isPublic();
}
?>
Parent methods (regardless of visibility) are also available to a ReflectionObject. E.g.,
<?php
class ParentObject {
public function parentPublic( ) {
}
private function parentPrivate( ) {
}
}
class ChildObject extends ParentObject {
}
$Instance = new ChildObject();
$Reflector = new ReflectionObject($Instance);
var_dump($Reflector->hasMethod('parentPublic')); // true
var_dump($Reflector->hasMethod('parentPrivate')); // true
?>
note that even if private method will also be 'has'.