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Home Backend Development PHP Tutorial PHP对象编程问题,Call to a member function hello() on a non-object

PHP对象编程问题,Call to a member function hello() on a non-object

Jun 23, 2016 pm 02:21 PM

<?php	$instest = new test();	$insobject = new object();	$insobject->objectValue = "final";	$instest->test();	class test{		var $testValue = "testValueins";		function test(){			print_r($insobject);			$insobject->hello();		}	}	class object{		var $objectValue = "original";		function hello(){			echo $objectValue;		}	}?>
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报错如下

Notice: Undefined variable: insobject in C:\wamp\www\zhebo\test.php on line 11
Call Stack
Notice: Undefined variable: insobject in C:\wamp\www\zhebo\test.php on line 12
Fatal error: Call to a member function hello() on a non-object in C:\wamp\www\zhebo\test.php on line 12

这有什么问题么,怎样才可以达到在实例里引用别的实例里的方法,或者有什么更好地解决方法?
我很急,希望大家可以帮忙。非常感谢啊。非常紧急。第一次用对象的思想编程还不太懂啊。


回复讨论(解决方案)

	$instest = new test();	$insobject = new object();	//$insobject->objectValue = "final";	object::$objectValue= "final";	$instest->test();    class test{        var $testValue = "testValueins";        function test(){           object::hello();        }    }    class object{        public static $objectValue = "original";        Public static function hello(){            echo self::$objectValue.'<br>';        }    }
Copy after login

?完?才??你??伙不??,後悔了,

?完?才??你??伙不??,後悔了,

没有啊,那个帖子还没有能解决方法出来,我当然还要等等再结贴啊 : )

?完?才??你??伙不??,後悔了,

看来只能使用静态化了?

未经传递或全局声明,内部不能访问外部的变量(对象也是用变量做载体的)
这是 php 语法的基本规则,不可逾越

$insobject = new object();$insobject->objectValue = "final";$instest = new test($insobject);//$instest->test(); 这是构造函数,一般不这样调用 class test{  var $testValue = "testValueins";  function test($insobject){    print_r($insobject);    $insobject->hello();  }} class object{  var $objectValue = "original";  function hello(){    echo $this->objectValue; //访问属性要这样  }}
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Copy after login
Copy after login
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Copy after login
object Object ( [objectValue] => final ) final

未经传递或全局声明,内部不能访问外部的变量(对象也是用变量做载体的)
这是 php 语法的基本规则,不可逾越

$insobject = new object();$insobject->objectValue = "final";$instest = new test($insobject);//$instest->test(); 这是构造函数,一般不这样调用 class test{  var $testValue = "testValueins";  function test($insobject){    print_r($insobject);    $insobject->hello();  }} class object{  var $objectValue = "original";  function hello(){    echo $this->objectValue; //访问属性要这样  }}
Copy after login
Copy after login
Copy after login
Copy after login
Copy after login
object Object ( [objectValue] => final ) final

那我现在应该怎么在外部调用 test里的test函数呢,如果一般不这样使用的话


未经传递或全局声明,内部不能访问外部的变量(对象也是用变量做载体的)
这是 php 语法的基本规则,不可逾越

$insobject = new object();$insobject->objectValue = "final";$instest = new test($insobject);//$instest->test(); 这是构造函数,一般不这样调用 class test{  var $testValue = "testValueins";  function test($insobject){    print_r($insobject);    $insobject->hello();  }} class object{  var $objectValue = "original";  function hello(){    echo $this->objectValue; //访问属性要这样  }}
Copy after login
Copy after login
Copy after login
Copy after login
Copy after login
object Object ( [objectValue] => final ) final

那我现在应该怎么在外部调用 test里的test函数呢,如果一般不这样使用的话

另外构造函数不是 __construct()么?

调用构造函数和 new 是一样的
都是返回一个类的实例



未经传递或全局声明,内部不能访问外部的变量(对象也是用变量做载体的)
这是 php 语法的基本规则,不可逾越

$insobject = new object();$insobject->objectValue = "final";$instest = new test($insobject);//$instest->test(); 这是构造函数,一般不这样调用 class test{  var $testValue = "testValueins";  function test($insobject){    print_r($insobject);    $insobject->hello();  }} class object{  var $objectValue = "original";  function hello(){    echo $this->objectValue; //访问属性要这样  }}
Copy after login
Copy after login
Copy after login
Copy after login
Copy after login
object Object ( [objectValue] => final ) final

那我现在应该怎么在外部调用 test里的test函数呢,如果一般不这样使用的话

另外构造函数不是 __construct()么?

我想起来了,php4里同名函数默认是构造函数


?完?才??你??伙不??,後悔了,

看来只能使用静态化了? ??化速度更快,不?看你的?法似乎是?可奈何,?啥呢?

php5 也是一样的,C++ 也是




未经传递或全局声明,内部不能访问外部的变量(对象也是用变量做载体的)
这是 php 语法的基本规则,不可逾越

$insobject = new object();$insobject->objectValue = "final";$instest = new test($insobject);//$instest->test(); 这是构造函数,一般不这样调用 class test{  var $testValue = "testValueins";  function test($insobject){    print_r($insobject);    $insobject->hello();  }} class object{  var $objectValue = "original";  function hello(){    echo $this->objectValue; //访问属性要这样  }}
Copy after login
Copy after login
Copy after login
Copy after login
Copy after login
object Object ( [objectValue] => final ) final

那我现在应该怎么在外部调用 test里的test函数呢,如果一般不这样使用的话

另外构造函数不是 __construct()么?

我想起来了,php4里同名函数默认是构造函数

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