A BUG and solution for the PHP is_subclass_of function_PHP tutorial

The role of is_subclass_of:

Copy code The code is as follows:

bool is_subclass_of (object object, string class_name)

If the class of object object is If the class class_name is a subclass, TRUE is returned, otherwise FALSE is returned.
Note: Since PHP 5.0.3, you can also use a string to specify the object parameter (class name).

Usage example:

Copy code The code is as follows:

# Determine whether $className is Subclass of $type
is_subclass_of($className,$type);

There will be a bug in the interface before php5.3.7 version

bug: https://bugs.php.net/bug.php?id=53727

Copy code The code is as follows:

interface MyInterface {}
class ParentClass implements MyInterface { }
class ChildClass extends ParentClass { }

# true
is_subclass_of('ChildClass', 'MyInterface');
# false
is_subclass_of('ParentClass', 'MyInterface');

Solution:

Copy code The code is as follows:

function isSubclassOf($className, $type){
// If the class to which $className belongs is If it is a subclass of $type, return TRUE
if (is_subclass_of($className, $type)) {
return true;
}

// If php version>=5.3. 7 There is no interface bug, so $className is not a subclass of $type
if (version_compare(PHP_VERSION, '5.3.7', '>=')) {
return false;
}

// There will be no bug if $type is not an interface, so $className is not a subclass of $type
if (!interface_exists($type)) {
return false;
}

// Create a reflection object
$r = new ReflectionClass($className);
// Determine whether the class belongs to the $type interface through the reflection object
return $r->implementsInterface($ type);
}

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