PHP MySQL至JSON输出格式

Question

I have my json echo working

echo '{"detailsjson":'.json_encode($var).'}';

Now I want to write this to a file on server example output.json

I use the php code

 $json_data = {"detailsjson":.json_encode($var).};
 file_put_contents('output.json', $json_data);

i don't get the file, but for

file_put_contents("output.json", json_encode($var));

it work. I want to include detailsjson in my json so that i can get

{"detailsjson":[{"Name":"Amateur : Paul Smith",.....

Thanks

Answer 1

Your $json_data variable is not "valid". You have to put everything in single quotes to make it work (not in double quotes because you use them in your json). Like this:

$json_data = '{"detailsjson":'.json_encode($var).'}';

Update (see comment from Hassan ):
It is better to do this with pure arrays.

$json_data = json_encode(['detailsjson' => $var]);

You can compare them by speed here (using a string) and here (using pure arrays).