php - how to format json with array of json -

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i want output in json this

response:{url="www.google.com/raj.png", size=12.344kb},{url="www.google.com/raj2.png", size=12.344kb},{url="www.google.com/raj4.png", size=12.344kb}

but getting

"url=> www.google.com/img1.png size => 12.344 kb,url=> www.google.com/img2.png size => 12.344 kb" 

//using loop here {   $response[] = array('url' => 'url_value','size' => 'file_size'); }  //without loop hardcoded values:  $response = array ( array('url' => "www.google.com/raj.png",'size' => "12.344kb"), array('url' => "www.google.com/img2.png",'size' => "10.344kb") );  return json_encode($response);

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