execute php echo as parameter value

Question

I have below code & I am generating tracking_id values manually & its working fine :

<?php

$data = [
"client_reference_id" => "ABCD",
"tracking_id" => "1234",
];
$data = json_encode($data);

$curl = curl_init($url);
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
$curl_response = curl_exec($curl);
curl_close($curl);
echo $curl_response ."\n";

Result :

{"response":[{"tracking_id":"1234",}],

Now i need to create tracking_id dynamically.... so i tried like below :

"tracking_id" => "$r = 'DOCC'. mt_rand(0000000001,9999999999); echo $r;",

I got below Result :

{"response":[{"tracking_id":" = 'DOCC'. mt_rand(0000000001,9999999999); echo ;","

But i should get some random number as tracking_id....

Means php code inside parameter is not working....

Are you just looking to set a specific key in an array? Don't enclose it all in quotes then: `"tracking_id" => 'DOCC' . mt_rand(0000000001,9999999999),` — h2ooooooo, Nov 05 '18 at 13:14
Possible duplicate of [Concatenate PHP function output to a string like variables](https://stackoverflow.com/questions/27494038/concatenate-php-function-output-to-a-string-like-variables) — MonkeyZeus, Nov 05 '18 at 13:14
@h2ooooooo sometimes it work, but sometime it give this message : `{"response":[{"tracking_id":"DOCC815327051","status":"REQUEST_REJECTED","message":["trackingId : Invalid tracking ID, Provided value: [DOCC815327051]"]}],` — , Nov 05 '18 at 13:24

Manpreet · Accepted Answer · 2018-11-05T13:35:15.870

1

As your require 10 digit random number:

function randomNumber($length) {
$result = '';

for($i = 0; $i < $length; $i++) {
    $result .= mt_rand(1, 9);
}

return $result;
}

$data = [
"client_reference_id" => "ABCD",
"tracking_id" => 'DOCC'.randomNumber(10);//no need to echo, just assign it
];
$data = json_encode($data);

$curl = curl_init($url);
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
$curl_response = curl_exec($curl);
curl_close($curl);
echo $curl_response ."\n";

edited Nov 05 '18 at 13:35

answered Nov 05 '18 at 13:15

Manpreet

2,450
16
21

Do reduce the max value mt_rand to mt_rand(1111111,9999999) – Manpreet Nov 05 '18 at 13:23
sometimes it work, but sometime it give this message : `{"response":[{"tracking_id":"DOCC815327051","status":"REQUEST_REJECTED","message":["trackingId : Invalid tracking ID, Provided value: [DOCC815327051]"]}],` – Nov 05 '18 at 13:23
check your api, it might only allow digits. replace with "tracking_id" => mt_rand(1111111,9999999); – Manpreet Nov 05 '18 at 13:25
no, it should be in this format only : `DOCC-ten digits` – Nov 05 '18 at 13:26
do this: "tracking_id" => 'DOCC'.mt_rand(11111,99999).mt_rand(11111,99999); – Manpreet Nov 05 '18 at 13:28
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/183126/discussion-between-manpreet-and-vickey-colors). – Manpreet Nov 05 '18 at 13:29

score 0 · Answer 2 · answered Nov 05 '18 at 13:14

0

Refactor your code:

$r = 'DOCC'. mt_rand(0000000001,9999999999);

$data = [
  "client_reference_id" => "ABCD",
  "tracking_id" => $r,
];

answered Nov 05 '18 at 13:14

rjdown

9,162
3
32
45

Thanks, sometimes it work, but sometime it give this message : `{"response":[{"tracking_id":"DOCC815327051","status":"REQUEST_REJECTED","message":["trackingId : Invalid tracking ID, Provided value: [DOCC815327051]"]}],` – Nov 05 '18 at 13:25
Finally This worked for me : 'DOCC'.mt_rand(11111,99999).mt_rand(11111,99999), – Nov 05 '18 at 13:36
can you please tell me how to save that tracking number in database ? – Nov 05 '18 at 13:45
It is best to ask a new question, but here's an example https://stackoverflow.com/questions/18655706/pdo-with-insert-into-through-prepared-statements – rjdown Nov 05 '18 at 23:31

score 0 · Answer 3 · edited Nov 05 '18 at 16:19

0

Just replace $data array with the following.

$data = [
"client_reference_id" => "ABCD",
"tracking_id" => 'DOCC'.  mt_rand(0000000001,9999999999),
];

edited Nov 05 '18 at 16:19

Thomas Urban

4,649
26
32

answered Nov 05 '18 at 13:20

Chandra Sekar

302
1
13

Thanks , sometimes it work, but sometime it give this message : `{"response":[{"tracking_id":"DOCC815327051","status":"REQUEST_REJECTED","message":["trackingId : Invalid tracking ID, Provided value: [DOCC815327051]"]}],` – Nov 05 '18 at 13:24
please check the range of trackingId. and change the mt_rand function range – Chandra Sekar Nov 05 '18 at 13:26
it should be in this format only : `DOCC-ten digits` – Nov 05 '18 at 13:27
Finally This worked for me : 'DOCC'.mt_rand(11111,99999).mt_rand(11111,99999), – Nov 05 '18 at 13:37
can you please tell me how to save that tracking number in database ? – Nov 05 '18 at 13:44
Which dB are u using? – Chandra Sekar Nov 05 '18 at 17:53
Sorry for delay, i am using mysql..... i want to save `tracking_id` in database..... – Nov 06 '18 at 05:16
connect the db with PDO or mysqli_connect then run simple INSERT query this will work – Chandra Sekar Nov 06 '18 at 05:30

execute php echo as parameter value

3 Answers3