index.php

<?php

// update job
$data_file='Json_Folder/products.json';

$id =15;
$data = file_get_contents($data_file);
$json =  json_decode($data, true);

foreach($json as &$a){

    if ($a['id'] ==$id) {
        $a['name']='denizdeniz';
        $a['price']=10000000;
        $a['category']='denizdeniz';
    } 
   
}

$json = json_encode($json);
file_put_contents($data_file, $json);

?>

product.json

[{"id":1,"name":"Product 1","price":1,"category":"Electronic"},{"id":2,"name":"Product 2","price":2,"category":"Fashion"},{"id":3,"name":"Product 3","price":3,"category":"Home Decor"},{"id":4,"name":"Product 4","price":4,"category":"Electronic"},{"id":5,"name":"Product 5","price":5,"category":"Fashion"},{"id":6,"name":"Product 6","price":6,"category":"Home Decor"},{"id":7,"name":"Product 7","price":7,"category":"Electronic"},{"id":8,"name":"Product 8","price":8,"category":"Fashion"},{"id":9,"name":"Product 9","price":9,"category":"Home Decor"},{"id":10,"name":"deniz12","price":11,"category":"deniz12"},{"id":11,"name":"denizdeniz","price":10000000,"category":"denizdeniz"}]