如何使用PHP从JSON文件中删除前两个JSON对象 [英] How to remove first two JSON objects from JSON file using PHP

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？

推荐答案

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"}]

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