ReflectionClass::hasMethod

(PHP 5 >= 5.1.0, PHP 7)

ReflectionClass::hasMethod — 检查方法是否已定义

说明

public bool ReflectionClass::hasMethod ( string $name )

检查一个类中指定的方法是否已定义。

参数

name

要检查的方法的名称。

返回值

如果有这个方法返回 TRUE，否则返回 FALSE。

范例

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)

参见

User Contributed Notes

Xorifelse 22-Dec-2016 10:23
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
flancer64 at gmail dot com 02-Aug-2016 07:50
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.
michaelgranados at gmail dot com 19-May-2012 11:47
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();
}
?>
phoenix at todofixthis dot com 28-Oct-2010 06:47
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
?>
hanguofeng at gmail dot com 20-Oct-2010 06:09
note that even if private method will also be 'has'.