如何使用PHP从JSON文件中删除前两个JSON对象
问题描述:
我有一个名为'jason_file.json'的JSON文件,如下所示:
I have a JSON file named 'jason_file.json' that is look like:
[
{"name":"name1", "city":"city1", "country":"country1"},
{"name":"name2", "city":"city2", "country":"country2"},
{"name":"name3", "city":"city3", "country":"country3"},
{"name":"name4", "city":"city4", "country":"country4"},
{"name":"name5", "city":"city5", "country":"country5"}
]
使用循环,我想从文件中删除前两个对象,并以相同的顺序保存其余对象'jason_file.json'。所需结果应为:
Using for loop, I want to remove first two objects from file and save remaining objects in the same order in the 'jason_file.json'. Required result should be:
[
{"name":"name3", "city":"city3", "country":"country3"},
{"name":"name4", "city":"city4", "country":"country4"},
{"name":"name5", "city":"city5", "country":"country5"}
]
我该怎么办?
答
尝试一下:
<?php
$json = '[
{"name":"name1", "city":"city1", "country":"country1"},
{"name":"name2", "city":"city2", "country":"country2"},
{"name":"name3", "city":"city3", "country":"country3"},
{"name":"name4", "city":"city4", "country":"country4"},
{"name":"name5", "city":"city5", "country":"country5"}
]'; //file_get_contents('jason_file.json');
$json = json_encode(array_slice(json_decode($json, true), 2));
/* (1) decode the JSON string
<-----------
(2) cut off the first two elements
<-----------
(3) recode as JSON
*/
echo $json;
//file_put_contents('jason_file.json, $json);
输出:
[{"name":"name3","city":"city3","country":"country3"},{"name":"name4","city":"city4","country":"country4"},{"name":"name5","city":"city5","country":"country5"}]