method_exists detailed explanation

method_exists() is a PHP function used to check whether a class method exists. Its syntax is as follows:

method_exists(mixed $object, string $method_name): bool

Parameter description:

$object: The object example or class name to be checked.

$method_name: The method name to be checked.

Return value:

If the method pointed to by $method_name has been defined in the object class pointed to by $object, then true is returned.

Otherwise return false.

Example usage:

class MyClass {  
    public function myMethod() {  
        // 方法实现  
    }  
}  
  
$obj = new MyClass();  
var_dump(method_exists($obj, 'myMethod')); // 输出：bool(true)  
  
$anotherObj = new stdClass();  
var_dump(method_exists($anotherObj, 'myMethod')); // 输出：bool(false)

In the above example, we first define a class named MyClass and define a method named myMethod in it. Then, we create an instance object $obj of MyClass and use the method_exists() function to check whether the myMethod method exists in the $obj object. Since the method is defined in the MyClass class, it returns true.

Next, we create a stdClass object $anotherObj and use the method_exists() function to check whether the myMethod method exists in the $anotherObj object. Since the myMethod method is not defined in the stdClass class, false is returned.

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