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how do I set keys for JSONObjects in PHP


json_encode isn't actually setting any indices of your JSON object, you are doing so in PHP. json_encode just takes the structure you provide it, and converts it to a string in valid JSON (if possible).

What you need to do is instead of using array_push($row, $width), do something along the lines of: $row['width'] = $width;, and the same for $height. Then your $row array will have the key width that points to the variable $width, and json_encode will encode it appropriately.


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