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PHP instanceof 关键字
tryphp_keyword_instanceof
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<!DOCTYPE html> <html> <body> <?php class MyClass {} class AnotherClass extends MyClass{} $obj = new AnotherClass(); if($obj instanceof AnotherClass) { echo "The object is AnotherClass"; } // The object is also an instance of the class it is derived from if($obj instanceof MyClass) { echo "The object is MyClass<br>"; } ?> </body> </html>