Question

我正在上课，我尝试使用json_encode输出它，但变量不会改变。

PHP：

<?php

class person { 
    public $person = "";
}
class name {
    public $lastname = "";
    public $firstname  = "";
}

$user = new person();
$user->person = new name();

$user->lastname = "Foo";
$user->firstname  = "Bar";

echo json_encode($user);
?>

输出：

{＆＃34;人＆＃34; {＆＃34;姓＆＃34;：＆＃34;＆＃34;＆＃34;姓名＆＃34;：＆＃34;＆＃34;} ＆＃34;姓＆＃34;：＆＃34;富＆＃34;＆＃34;姓名＆＃34;：＆＃34;酒吧＆＃34;}

预期输出：

{＆＃34;人＆＃34; {＆＃34;姓＆＃34;：富＆＃34;＆＃34;＆＃34;姓名＆＃34;：＆＃34;酒吧＆＃34;} }

有人可以向我解释为什么它不会改变吗？

Answer 1

要设置$user的名称，不应该打电话：

$user->person->firstname = "Foo";
$user->person->lastname  = "Bar";

或者，您也可以在name

中设置person之前设置变量

$name = new name();
$name->firstname = "Foo";
$name->lastname  = "Bar";

$user->person = $name;

class person {
    public $firstname;
    public $lastname;
}

$user = new person();

$user->firstname = "Foo";
$user->lastname  = "Bar";

echo json_encode(array('person' => $user));

修改

如果您只想要一个类，并且想要复制预期的输出：

- (void)addConstraintWithListNavigationViewController:(UIView *)listViewNavigation y:(CGFloat)y height:(CGFloat)height
{
    //WIDTH_ListTableView = 0.4

    //set x = 0;
    NSLayoutConstraint *constraintToAnimate1 = [NSLayoutConstraint constraintWithItem:listViewNavigation
                                                                            attribute:NSLayoutAttributeLeft
                                                                            relatedBy:NSLayoutRelationEqual
                                                                               toItem:self.view
                                                                            attribute:NSLayoutAttributeLeft
                                                                           multiplier:0.00
                                                                             constant:0];
    [self.view addConstraint:constraintToAnimate1];


    //set y = y;
    NSLayoutConstraint *constraintToAnimate2 = [NSLayoutConstraint constraintWithItem:listViewNavigation
                                                                            attribute:NSLayoutAttributeTop
                                                                            relatedBy:NSLayoutRelationEqual
                                                                               toItem:self.view
                                                                            attribute:NSLayoutAttributeBottom
                                                                           multiplier:0.00
                                                                             constant:y];
    [self.view addConstraint:constraintToAnimate2];








    //set Width = self.view.frame.size.width*0.4
    NSLayoutConstraint *constraintToAnimate3 = [NSLayoutConstraint constraintWithItem:listViewNavigation
                                                                            attribute:NSLayoutAttributeWidth
                                                                            relatedBy:NSLayoutRelationEqual
                                                                               toItem:self.view
                                                                            attribute:NSLayoutAttributeWidth
                                                                           multiplier:1-WIDTH_ListTableView
                                                                             constant:0.0];
    [self.view addConstraint:constraintToAnimate3];





    //Set height = height
    NSLayoutConstraint *constraintToAnimate4 = [NSLayoutConstraint constraintWithItem:listViewNavigation
                                                                            attribute:NSLayoutAttributeHeight
                                                                            relatedBy:NSLayoutRelationEqual
                                                                               toItem:nil
                                                                            attribute:NSLayoutAttributeNotAnAttribute
                                                                           multiplier:0.00
                                                                             constant:height];
    [self.view addConstraint:constraintToAnimate4];
}

Answer 2

更改这些行

$user->lastname = "Foo";
$user->firstname  = "Bar";

要

$user->person->lastname = "Foo";
$user->person->firstname  = "Bar";

你永远不会分配这些属性，这就是为什么它们在你的字符串中是空的。相反，您将它们分配给user而不是name，这就是您在编码name之后看到它们的原因。严格说来，这不应该被允许工作，你应该得到一个严格的警告。

Answer 3

name课程已分配到$user->person。

因此，当您在firesname课程中为lastname和name分配值时，您应使用以下代码

$user->person->lastname="Foo";
$user->person->firstname="Bar";

或

firstname类中的lastname和name变量被视为新数据

PHP：更改类

3 个答案: