php5.3 注意事项说明

<?php
class Zend_Db_Table_Select {
//表示当前这个类文件位于Zend/Db/Table下
}

<?php
namespace Zend/Db/Table
class Select {
}

<?php
class A {
    public static function who() {
        echo __CLASS__;
    }
    public static function test() {
        self::who();
    }
}
class B extends A {
    public static function who() {
         echo __CLASS__;
    }
}
B::test();
?>

<?php
class A {
    public static function who() {
        echo __CLASS__;
    }
    public static function test() {
        static::who(); // 这里实现了延迟的静态绑定
    }
}
class B extends A {
    public static function who() {
         echo __CLASS__;
    }
}
B::test();
?>

<?php
$msg = "hello";
$callback  =  function() use($msg){
    print_r($msg);
}
$msg = "hello world!";
callback($callback);

<?php
const CONSTANT = 'Hello World';