How to Merge JSON Objects in PHP?

Merging JSON Objects in PHP

When working with JSON data, there often arises a need to merge or combine multiple objects into a single cohesive entity. In PHP, this task can be accomplished through a series of steps:

1. Decoding the JSON:

The first step is to decode the JSON strings into PHP arrays using the json_decode() function. This function can take a second parameter true to associate keys to the arrays rather than treating them as objects.

2. Merging the Arrays:

Once the JSON strings have been decoded, the next step is to merge the arrays using the array_merge() function. This function combines the two arrays, replacing duplicate keys with the values from the second array.

3. Encoding the Result:

After merging the arrays, the final step is to encode the result back into a JSON string using the json_encode() function.

Example:

Consider the following two JSON strings:

JSON 1:

[{"COLUMN_NAME":"ORDER_NO","COLUMN_TITLE":"Order Number"}]

JSON 2:

[{"COLUMN_NAME":"ORDER_NO","DEFAULT_VALUE":"1521"},
{"COLUMN_NAME":"CUSTOMER_NO","DEFAULT_VALUEE":"C1435"}]

To merge these two JSON strings and obtain a result that includes both the column name and default value, the following code can be used:

$json1 = '[{"COLUMN_NAME":"ORDER_NO","COLUMN_TITLE":"Order Number"}]';
$json2 = '[{"COLUMN_NAME":"ORDER_NO","DEFAULT_VALUE":"1521"},
{"COLUMN_NAME":"CUSTOMER_NO","DEFAULT_VALUEE":"C1435"}]';

$decodedJson1 = json_decode($json1, true);
$decodedJson2 = json_decode($json2, true);

$mergedArray = array_merge($decodedJson1, $decodedJson2);

$mergedJson = json_encode($mergedArray);

The resulting $mergedJson variable will contain the following JSON string:

[{"COLUMN_NAME":"ORDER_NO","COLUMN_TITLE":"Order Number","DEFAULT_VALUE":"1521"},
{"COLUMN_NAME":"CUSTOMER_NO","DEFAULT_VALUEE":"C1435"}]

This demonstrates how to merge JSON objects in PHP and derive a merged JSON string that combines the data from the input JSONs.

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