php cast object to subclass

PHP Core Knowledge Essentials, PHP core points PHP: scripting language, website building, server-side running PHP Definition: A server-side HTML scripting/programming language, is a simple, object-oriented, interpreted, robust, secure, high

PHP Basics first, the initial knowledge of PHPPHP is an embedded language used in combination with HTML. 1. PHP tags Default tag Short Mark , you need to turn on the Short_open_tag option in php.ini short mark and other tags are not recommended 2,

PHP Magic Methods/Functions Citation http://blog.csdn.net/inqihoo/article/details/9235103 In PHP syntax, some of the system's own method names, which begin with a double underscore, are invoked under certain circumstances. The so-called magic

Object-Oriented ProgrammingObject-oriented programming (object oriented Programming,oop, object-oriented programming) is the main idea of the composition of the problem of the various transactions into various objects, the purpose of building

Transfer Value Assignment: When you assign the value of an expression to a variable, the value of the entire original expression is assigned to the target variable. This means that, for example, when a variable's value is assigned to another

HTTP protocol: Hypertext Transfer Protocol, B/S Architecture project follows basic protocol, browser server communication Fundamentals (Request connection (TCP/IP protocol), connection success, browser send request, server processing request,

The two days of learning polymorphism, nature involves the method of rewriting. In the author's blind use of code toss the process, found that the error type mentioned "This static method cannot hide the instance method from Fu" (such as), so that

One, Dbquery objectNow, our Dbquery object simply imitates a stored procedure-once executed, returns a result resource that must be saved, and if you want to use a function on the result set (such as num_rows () or Fetch_row ()), you must pass the

PHP Multi-inheritance is very confusing, and diamond of death two small middle large inheritance tree, so use trait substitution (clear, realize the reuse code, flattening the way more clear, resolved two semantics (need to execute what method or

1. Defining classesclass ren{public$name// define member variable var$sex; function Say () // definition method {echo "This person is speaking";}}2. Instantiation$ren New Ren (); // instantiation of $ren // Calling member variables $ren->sex=