Using Associative arrays

You cannot access your data like your normally would an array, as said by @Omar_Tammam php error you are using Array objects.

Here is an example of how your data is set up and how you could use it:

    # Creating your stdclass Object Array     $order_details['order_data'] = new stdClass();     $order_details['order_data']->id_order = 2;     $order_details['order_data']->id_client = 1;     $order_details['order_data']->date_order = "2022-04-03 18:43:18";     $order_details['order_data']->address = "meu puto";     $order_details['order_data']->city = "Rabinho";     $order_details['order_data']->email = "[email protected]";     $order_details['order_data']->cellphone = "919788427";     $order_details['order_data']->code_order = "QX669156";     $order_details['order_data']->status = "PENDING";     $order_details['order_data']->message = "";     $order_details['order_data']->created_at = "2022-04-03 18:43:18";     $order_details['order_data']->updated_at = "2022-04-03 18:43:18";     $order_details['products_order'][0] = new stdClass();     $order_details['products_order'][0]->id_order_product = "8";     $order_details['products_order'][0]->id_order = "2";     $order_details['products_order'][0]->name_product = "Green Tshirt";     $order_details['products_order'][0]->price_unity = "35.15";     $order_details['products_order'][0]->quantity = "1";     $order_details['products_order'][0]->created_at = "2022-04-03 18:43:18";          # To print all the data as example, showing stdClass Objects can      # be accessed through a foreach similar to an array     // foreach($order_details as $od){     //     echo PHP_EOL, "_________________________", PHP_EOL;     //     foreach($od as $a){     //         if(!is_object($a)) echo $a, PHP_EOL;     //         else foreach($a as $o) echo $o, PHP_EOL;     //     }     //     echo PHP_EOL, "_________________________", PHP_EOL;     // }          # this is wrong & will not work:     echo $order_details['products_order'][0]['name_product'];          # you would want to use this:     echo $order_details['products_order'][0]->name_product;     # more examples:     echo $order_details['order_data']->address;     echo $order_details['order_data']->city;     echo $order_details['order_data']->email;     echo $order_details['products_order'][0]->created_at;      # or as you wanted:     $image = $order_details['products_order'][0]->name_product;      echo $image;     # result would be: Green Tshirt 

Online Sandbox Example: https://onlinephp.io/c/76370

I also created a recursive function that converts an array to or from an stdClass by reference:

function array_to_stdClass(&$array){     $tmp = $array;     $array = new stdClass();     foreach($tmp as $k => $v) $array->$k = (!is_object($v) && !is_array($v)) ? $v:array_to_stdClass($v);     return $array; }  function stdClass_to_array(&$stdClass){     $tmp = $stdClass;     $stdClass = array();     foreach($tmp as $k => $v) $stdClass[$k] = (!is_object($v) && !is_array($v)) ? $v:stdClass_to_array($v);     return $stdClass; } 

Online Sandbox Example: https://onlinephp.io/c/4b183

the structure of the data is an array of array of object

this should works with you :

$image = $order_details['products_order'][0]->name_product; 

$image = $order_details['products_order'][0]); 

See the [0] in [0] => stdClass Object? The following should work ...

$image = $order_details['products_order'][0]['name_product'];