I got these two example.
Example1:
$data1 = "{'username':'myUserName','password':'myPassWord'}";
and Example2:
$username= "myUserName";
$password= "myPassWord";
$data2 = "{'username':'".$username."','password':'".$password."'}";
Which i send to cUrl post request in php. First example works while second does not. Why is that? I also tried setting variables in associative array, then using json_encode, then send it to cUrl. Nothing works except first example. I'm losing my mind here.
For valid JSON, you need to use double quotes, so change
$data2 = "{'username':'".$username."','password':'".$password."'}";
to
$data2 = '{"username":"' . $username . '", "password":"' . $password . '"}';
EDIT: a sharp remark by @LawrenceCherone, to ensure you don't run into trouble with usernames/passwords that carry " in them, always use json_encode() e.g.:
<?php
$username= "myUserName";
$password= 'my"PassWord'; // password containing "
$arr = ['username' => $username, 'password' => $password];
$result = json_encode($arr);
Output $result: Valid JSON
{"username":"myUserName","password":"my\"PassWord"}
" which will break the JSON
json_encode(compact(...))Dont build your own json! Use json_encode() instead, and use compact() to make an array from global vars.
<?php
$username= "myUserName";
$password= "myPassWord";
$data2 = json_encode(compact('username', 'password'));
use $data2 for whatnot, which will contain:
{"username":"myUserName","password":"myPassWord"}