In PHP, an object array is a powerful data structure that allows you to store and manipulate complex data in a flexible and efficient manner. To create an object array in PHP, you can use the stdClass or array() function to define the object and then populate it with data.

Here's a simple example of creating an object array in PHP using stdClass:

```php

// Create an empty object

$obj = new stdClass();

// Add properties to the object

$obj->name = 'John';

$obj->age = 30;

$obj->email = 'john@example.com';

```

In this example, we first create an empty object using the stdClass() function, and then we add properties to the object using the -> operator.

You can also create an object array using the array() function in PHP. Here's how you can do that:

```php

// Create an object array using array()

$objArray = array(

'name' => 'John',

'age' => 30,

'email' => 'john@example.com'

);

```

In this example, we use the array() function to define an object array and specify the key-value pairs for the properties.

Once you have created an object array in PHP, you can easily manipulate the data using various array functions such as foreach, array_push, unset, and more. You can also convert the object array to a JSON string using the json_encode() function to send data to the client-side for processing.

Here's an example of converting an object array to JSON in PHP:

```php

// Convert object array to JSON

$jsonString = json_encode($objArray);

// Output the JSON string

echo $jsonString;

```

In this example, we use the json_encode() function to convert the object array to a JSON string, which can then be sent to the client-side for further processing.

Using object arrays in PHP can be very useful for handling complex data structures and manipulating data efficiently. It's a fundamental skill for web developers, and mastering it will greatly enhance your ability to work with data in PHP.

So, next time you need to store and manipulate complex data in your PHP application, consider using object arrays for better organization and efficiency.