PHP code example of alto / json-patch

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

alto / json-patch example snippets

use Alto\JsonPatch\JsonPatch;

$document = [
    'user' => ['name' => 'Alice', 'role' => 'editor'],
    'status' => 'draft',
];

$patch = [
    ['op' => 'replace', 'path' => '/user/role', 'value' => 'admin'],
    ['op' => 'replace', 'path' => '/status', 'value' => 'published'],
];

$result = JsonPatch::apply($document, $patch);
// ['user' => ['name' => 'Alice', 'role' => 'admin'], 'status' => 'published']

$before = ['version' => 1, 'status' => 'draft'];
$after = ['version' => 2, 'status' => 'published', 'author' => 'Alice'];

$patch = JsonPatch::diff($before, $after);
// [
//     ['op' => 'replace', 'path' => '/version', 'value' => 2],
//     ['op' => 'replace', 'path' => '/status', 'value' => 'published'],
//     ['op' => 'add', 'path' => '/author', 'value' => 'Alice'],
// ]

use Alto\JsonPatch\DiffOptions;

$before = [
    'items' => [
        ['id' => 'a', 'qty' => 1],
        ['id' => 'b', 'qty' => 2],
    ],
];

$after = [
    'items' => [
        ['id' => 'b', 'qty' => 3],  // Modified and reordered
        ['id' => 'c', 'qty' => 1],  // Added
    ],
];

$options = new DiffOptions(['/items' => 'id']);
$patch = JsonPatch::diff($before, $after, $options);
// Generates move, add, remove, and replace operations for individual items

// Get a value at a JSON pointer path
$name = JsonPatch::get($document, '/user/name');

// Test if a value matches (returns bool)
$isAdmin = JsonPatch::test($document, '/user/role', 'admin');

// Validate patch structure without applying
$errors = JsonPatch::validate($patch);

class ChangeLog
{
    public function recordChange(array $before, array $after): void
    {
        $patch = JsonPatch::diff($before, $after);

        $this->store([
            'parent_hash' => hash('sha256', json_encode($before)),
            'patch' => $patch,
            'result_hash' => hash('sha256', json_encode($after)),
            'timestamp' => time(),
        ]);
    }

    public function verifyIntegrity(string $recordId): bool
    {
        $record = $this->fetch($recordId);
        $parent = $this->reconstructState($record['parent_hash']);

        $result = JsonPatch::apply($parent, $record['patch']);
        $computedHash = hash('sha256', json_encode($result));

        return $computedHash === $record['result_hash'];
    }
}

try {
    JsonPatch::apply($doc, $patch);
} catch (JsonPatchException $e) {
    // "Operation 0 (replace): path '/missing/path' not found."
    // "Operation 1 (add): invalid path '/items/-1'."
}

$options = new DiffOptions([
    '/users' => 'id',        // Use 'id' field for /users array
    '/items' => 'sku',       // Use 'sku' field for /items array
]);