php - Array to string conversion error with json_encode -

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i have connect function mysql database so:

function connect() {          $config = parse_ini_file('../../config.ini');          // try , connect database         self::$conn = mysqli_connect('localhost',$config['username'],$config['password'],$config['dbname']);          //check if both bools , false === checks type , equality         if(self::$conn === false) {              header("http/1.1 500 internal server error");             header("content-type: application/json");             $response = array("response"=>"failed connect database");             echo "json_encode($response)";             die();          }       }

i having issue when json_encode (for fail connection). error : notice: array string conversion in /var/www/html/somesite.co/public_html/api/index.php on line 47
json_encode(array)

really have no idea why i'm getting error. have encoded , echo'd , array before no issues. give me pointers might doing wrong please?

you getting error trying echo array. , don't wrap function call in quotes.

replace 

echo "json_encode($response)";

with 

echo json_encode($response);

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