How to traverse json data in php program

In the previous article "Two methods for deleting key values ​​in associative arrays in PHP", I introduced how to delete key values ​​in associative arrays. Friends in need can read and learn~

The focus of this article is to teach you how to traverse json data.

I wonder how much everyone knows about json? JSON is actually a lightweight data exchange format; JSON is also a sequence of markers, which contains six construction characters, strings, numbers and three literal names; JSON is also a serialized object or array . (Related recommendations: "What is a JSON file" "What does json mean? What is it used for?")

After a brief understanding of json, we will Directly upload the code:

PHP method of traversing json data:

Note: This example requires looping through 10924 10923 11982 and the corresponding id title and other values.

<?php
$str = &#39;{
"10924": {
"id": "10924",
"title": "天津",
"streamline_title": "狗不理",
"unit": "点",
"goods_type": "168",
"goods_type_title": "包子"
},
"10923": {
"id": "10923",
"title": "北京",
"streamline_title": "王府井",
"unit": "点",
"goods_type": "104",
"goods_type_title": "吃货天堂"
},
"11982": {
"id": "11982",
"title": "南京",
"streamline_title": "夫子庙",
"unit": "点",
"goods_type": "351",
"goods_type_title": "灯会"
}
}&#39;;
foreach (json_decode($str) as $v)
{
    echo "{$v->id} {$v->title}"; //其他的一样的
}

Output result:

10924 天津
10923 北京
11982 南京

Here is a json_decode function:

json_decode is a new one after php5.2.0 PHP's built-in function is used to encode strings in JSON format. So how to use this function?

The syntax rules of json_decode:

json_decode ( string $json [, bool $assoc = false [, int $depth = 512 [, int $options = 0 ]]] )

json_decode accepts a JSON format string and converts it into a PHP variable. When the parameter $assoc is TRUE, array will be returned, otherwise object will be returned. .

JSON format string

$json = '{"a":"php","b":"mysql","c":3}';

where a is the key, and php is the key value of a.

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