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php输出页面所有变量
print_r(get_defined_vars());

此函数返回一个包含所有已定义变量列表的多维数组,这些变量包括环境变量、服务器变量和用户定义的变量。

获取所有已经定义的函数
get_defined_functions()
获取所有可用的模块
get_loaded_extensions()
获取指定模块的可用函数
get_extension_funcs()

该函数返回指定模块所有可用的函数。传入的参数(模块名称)必须是小写

获取关联数组的名字所有的常量和他们的值 ?  (PHP 4 >= 4.1.0, PHP 5)
get_defined_constants()

get_declared_classes (PHP 4, PHP 5) ?  获取由已定义类的名字所组成的数组

get_declared_classes()

get_included_files()(或者get_require_files) (PHP 4, PHP 5) ?  获取由已定义类的名字所组成的数组

get_included_files()


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