注册送现金一元秒提现

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                          1. 当前位置:首页 > PHP教程 > php函数 > 列表

                            PHP中的is_a()函数和instanceof之间有什么区别?

                            发布:smiling 来源: PHP粉丝网  添加日期:2019-01-26 21:32:15 浏览: 评论:0 

                            ZAIPHPZHONGis_a()HANSHUHEinstanceofYUNSUANFUDEGONGNENGSHIXIANGSIDE,NEIMETAMENZHIJIANYOUSHENMEQUBIE?XIAMIANBENPIANWENZHANGJIULAIDAIDAJIAJIANDANLEJIEYIXIAis_a()HANSHUHEinstanceof,JIESHAOis_a()HANSHUHEinstanceofDEQUBIESHISHENME,XIWANGDUIDAJIAYOUSUOBANGZHU。

                            PHP is_a()函数

                            is_a()HANSHUSHIPHPZHONGDENEIZHIHANSHU,YONGYUJIANCHAJIDINGDUIXIANGSHIFOUSHUYUJIDINGLEI;TAHAIJIANCHAJIDINGDELEISHIFOUSHIJIDINGDUIXIANGDEFULEIZHIYI。

                            JIBENYUFA:

                            is_a( $object, $class_name, $allow_string )

                            CANSHU:is_a()HANSHUKEYIJIESHOUYIXIASANGECANSHU

                            注册送现金一元秒提现● object:YONGYUBAOCUNCESHIDUIXIANG。

                            注册送现金一元秒提现● class_name:YONGYUBAOCUNLEIMING。

                            注册送现金一元秒提现● allow_string:RUGUOSHEZHIDEZHIWEIFalse,ZEBUYUNXUJIANGZIFUCHUANLEIMINGCHENGZUOWEIDUIXIANG。

                            注册送现金一元秒提现FANHUIZHI:RUGUODUIXIANGSHUYUJIDINGDELEI,HUOZHECILEIZUOWEIQIFULEIZHIYI,ZEis_a()HANSHUFANHUITrue,FOUZEJIANGFANHUIFalseZHI。

                            注册送现金一元秒提现XIAMIANTONGGUODAIMASHILILAILEJIEYIXIAis_a()HANSHU。

                            1. <?php   
                            2.  
                            3. class hello {   
                            4.  
                            5.     var $store = 'Hello PHP!';   
                            6.  
                            7. }   
                            8.  
                            9.       
                            10.  
                            11. $PHPnew hello();   
                            12.  
                            13.       
                            14.  
                            15. // 检查$PHP是否是hello类的对象 
                            16.  
                            17. if (is_a($PHP'hello')) {   
                            18.  
                            19.     echo "Yes";   
                            20.  
                            21. }  //mailanhe.com 
                            22.  
                            23.       
                            24.  
                            25. ?> 

                            SHUCHU:

                            Yes

                            PHP instanceofYUNSUANFU

                            注册送现金一元秒提现ZAIPHPZHONGSHIYONGinstanceofYUNSUANFULAICHAMINGDUIXIANGSHIFOUSHILEIDESHILIHUASHILI。

                            JIBENYUFA:

                            $a instanceof MyClass

                            CAOZUOSHU:instanceofYUNSUANFUBAOHANYIXIALIANGGECAOZUOSHU

                            ● $a:BIAOSHIDUIXIANG。

                            ● MyClass:BIAOSHISHIYIGELEIMING。

                            注册送现金一元秒提现FANHUIZHI:RUGUODUIXIANGSHUYUGAIJIDINGDELEI,HUOZHEJIANGCILEIZUOWEIQIFULEIZHIYI,ZEFANHUITrue,FOUZEFANHUIFalseZHI。

                            XIAMIANTONGGUODAIMASHILILAILEJIEYIXIAinstanceofYUNSUANFU。

                            1. <?php   
                            2.  
                            3. class hello {   
                            4.  
                            5.     var $store = 'Hello PHP!';   
                            6.  
                            7. }   
                            8.  
                            9.  
                            10. $PHPnew hello();   
                            11.  
                            12.  
                            13. // 检查$PHP是否是hello类的对象 
                            14.  
                            15. if ($PHP instanceof hello) {   
                            16.  
                            17.     echo "Yes";   
                            18.  
                            19. }   
                            20.  
                            21. ?> 

                            SHUCHU:

                            Yes

                            is_a()HANSHUHEinstanceofYUNSUANFUZHIJIANDEQUBIE

                            注册送现金一元秒提现● is_a()SHIYIGEHANSHU,ERinstanceofSHIYIGEYUYANJIEGOU。is_a()HANSHUJIANGXIANZHEBIANMAN,YINWEITAJUYOUZHIXINGHANSHUDIAOYONGDESUOYOUKAIXIAO。

                            注册送现金一元秒提现● ZAIHANSHUHUIDIAODEQINGKUANGXIA(RUarray_map),YINWEIinstanceofBUSHIHANSHU,TASHIYIZHONGYUYANGOUZAO,SUOYITABUNENGYONGZUOHUIDIAO。DAN,HUIDIAOKEYIZAIis_a()HANSHUZHONGSHIYONG。

                            注册送现金一元秒提现● InstanceOfZHONGZHIJIELEIMINGDESHIYONGSHIJIANDUANYUis_a()HANSHU。

                            LI:

                            1. //语法短(比较) 
                            2.  
                            3. $a instanceof MyClass 
                            4.  
                            5. is_a$a, MyClass::class ) 

                            ● is_a()SHIYIGEHANSHU,TAJIANGYIGEDUIXIANGZUOWEICANSHU1,JIANGYIGEZIFUCHUANZUOWEICANSHU2,ERinstanceofJIANGYIGEDUIXIANGZUOWEICANSHU1,BINGQIEKEYIJIANGLEIMING、DUIXIANGSHILIHUOLEIBIAOSHIFU(BUDAIYINHAODELEIMING)ZUOWEICANSHU2。

                            is_a()DESHILI:

                            注册送现金一元秒提现//ZHIYOUZHEIYANGCAINENGDIAOYONGTA

                            is_a($object,$string);

                            注册送现金一元秒提现instanceofSHILI:

                            1. //对象实例       
                            2.  
                            3. $object instanceof $otherObject;  
                            4.  
                            5. //字符串类名 
                            6.  
                            7. $object instanceof $string
                            8.  
                            9. //类的标识符 
                            10.  
                            11. $object instanceof ClassName; 

                             

                            Tags: is_a instanceof

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