Correct way of adding text + php variable in json string?

Question

I am struggling a bit to find the correct way of adding a php variable in my json string, with text added just in front of the variable. This is what I have got so far...

  $postData = '
  {
    "message": "Web order '.$order_number.'"
  }
  ';

When I look at the printout there is a line break just after "Web order", but otherwise nothing seems to go wrong... is this the way to do it?

Yes, decode the json first using json_decode then add whatever you want to add in the object/array(depending if you decoded it as an object or as an array) then re-encode it. — Andrei
– Andrei, Commented Oct 3, 2019 at 13:12
At a glance that looks like it should work. Are you confident that $order_number contains a value that can be cast to string? — Gavin
– Gavin, Commented Oct 3, 2019 at 13:12

devpro · Accepted Answer · 2019-10-03 13:16:34Z

1

If you want to use json string, then make sure you have properly use your values in your array.

Example:

<?
$order_number = 1;
$yourArray = array('message'=>"Web order ".$order_number);
echo json_encode($yourArray);
?>

Result:

{"message":"Web order 1"}

Here, i am using an array for your data $yourArray and then use json_encode() for json string.

DEMO

answered Oct 3, 2019 at 13:16

devpro

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JessGabriel · Accepted Answer · 2019-10-03 13:16:52Z

1

Instead of concatenate string, use sprintf() Dealing directly with Json can become very harmful quickly. Prefer to use array then json_encode instead.

in your case, here is a simple example:

$message = sprintf('Web order %s', $order_number)
$postData = [
  'message' => $message
];

$json = json_encode($postData);

answered Oct 3, 2019 at 13:16

JessGabriel

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