我有一个类说,Foo有一个名为bar：

[PHP Fiddle Link]的json字符串属性

class Foo {

public $bar = '{"1455260079":"Tracking : #34567808765098767 USPS","1455260723":"Delivered","1455261541":"Received Back"}';

public function getBar(){

return (array) json_decode($this->bar);

}

public function remove($timestamp){

$newBar = $this->getBar();

print_r($newBar);

unset($newBar[$timestamp]);

print_r($newBar);

$this->bar = json_encode($newBar);

}

}

现在,要从bar中删除元素,我正在执行以下操作,我无法弄清楚它为什么不删除：

$foo = new Foo();

$foo->remove("1455261541");

echo $foo->bar;

打印出来：

Array

(

[1455260079] => Tracking : #34567808765098767 USPS

[1455260723] => Delivered

[1455261541] => Received Back

)

Array

(

[1455260079] => Tracking : #34567808765098767 USPS

[1455260723] => Delivered

[1455261541] => Received Back

)

{"1455260079":"Tracking : #34567808765098767 USPS","1455260723":"Delivered","1455261541":"Received Back"}

这背后的原因是什么？有帮助吗？

最佳答案 尝试下面的解决方案,我只是更改了getBar函数并在json_decode函数中添加了一个参数：

class Foo {

public $bar = '{"1455260079":"Tracking : #34567808765098767 USPS","1455260723":"Delivered","1455261541":"Received Back"}';

public function getBar(){

return json_decode($this->bar, true);

}

public function remove($timestamp){

$newBar = $this->getBar();

print_r($newBar);

unset($newBar[$timestamp]);

print_r($newBar);

$this->bar = json_encode($newBar);

}

}

$foo = new Foo();

$foo->remove("1455261541");

echo $foo->bar;

输出：

Array

(

[1455260079] => Tracking : #34567808765098767 USPS

[1455260723] => Delivered

[1455261541] => Received Back

)

Array

(

[1455260079] => Tracking : #34567808765098767 USPS

[1455260723] => Delivered

)

{"1455260079":"Tracking : #34567808765098767 USPS","1455260723":"Delivered"}