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Home Backend Development PHP Tutorial laravel 框架 数组和对象有点疑惑 - SegmentFault

laravel 框架 数组和对象有点疑惑 - SegmentFault

Jun 06, 2016 pm 05:27 PM
laravel php

都知道用到foreach($data as $val)循环的时候,$data可以是是数组、对象,
但是不解的是明明first(),get()方法获得的结果都是对象,first()获得的对象如$data,可以用$data['name']
但是get()获得的$data不可以,大家懂我的意思吗?,帮我解惑吧,谢谢了

回复内容:

都知道用到foreach($data as $val)循环的时候,$data可以是是数组、对象,
但是不解的是明明first(),get()方法获得的结果都是对象,first()获得的对象如$data,可以用$data['name']
但是get()获得的$data不可以,大家懂我的意思吗?,帮我解惑吧,谢谢了

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采纳

假设没有关联查询什么的,并且结果都转换成数组形式了(好表达一点~)。
first()获得的数据是一个一维数组,例如:

<code>$data=[
    'name' => 'zhangsan',
    'age' => 20,
    ...
];</code>
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这样的话使用$data['name']是正确输出的。

get()获得的数据是一个二维数组(即使只有1条数据),例如:

<code>$data=[
    0 => [
        'name' => 'zhangsan',
        'age' => 20
        ...
    ],
    ...
];</code>
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$data里可能有多条数组,所以要输出name的话要$data[0]['name'],$data[1]['name']...

foreach的内容可以是对象数组,数组的每个元素都是对象

第一:首先说说foreach:

<code>foreach ($items as $item){
    //这里面的$items狭义上是一个数组,往外扩可以理解为一个多元素的集合;
    //楼上说的对象数组就可以理解了
    }</code>
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第二:first()get():

first()

返回的一个Model对象,并且这个对象实现了ArrayAccess接口,所以你可以使用$data['name']这种方式获取数据

get()

返回的是一个 Model Collection,这里面的Collection就是集合的意思,你可以简单理解为对象数组,里面的每一个元素都是一个Model对象。在使用get()的情况下,哪怕是查询条件返回一条记录,也是一个包含一个元素的Collection,而在一个Collection(集合)对象中使用$data['name']必然会报错。

以上,学习laravel可以关注我的小站:https://laravist.com

楼上的各位大大已经解释的很清楚了,实在不能理解,你就理解为就像一维数组和多维数组的关系,说不定$data[0]['name']就可以访问了,可以好好看看PHP的ArrayAccess

laravel orm获取到的是对象集合.laravel文档里有关于集合的介绍和使用.

很简单,就因为这一行

<code>class Collection implements ArrayAccess, Arrayable, Countable, IteratorAggregate, Jsonable, JsonSerializable</code>
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foreach能用的是数组(array)和集合(collection)

如果不确定 每次在查询之后 添加 $query->toArray();就行了 就全部都是数组形式的了

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