How to remove first two JSON objects from JSON file using PHP - php

Question

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"}
]
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"}
]
How can I do it?

Answer 1

Try this:
<?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);
Output:
[{"name":"name3","city":"city3","country":"country3"},{"name":"name4","city":"city4","country":"country4"},{"name":"name5","city":"city5","country":"country5"}]

Answer 2

To make sure you end up with valid json, I would not edit the file manually.
Instead, read the file, parse the json, use array_shift() or something similar to remove the first two elements in the array, encode the resulting array as json and put it back in the file.

Answer 3

Well firstly, you will want to pull the file into a string. So
$str = file_get_contents('/path/to/my/file');
Then you will want to decode the string contents.
$arr = json_decode($str, true);
Finally shift the array twice
$arr = array_shift($arr);
$arr = array_shift($arr);
Or alternatively, slice the array
$arr = array_slice($arr, 2);
Finally, you can place the json string back into a file.
$newJson = json_encode($arr);
file_put_contents('/path/to/saved/file', $newJson);
Hope this helps!