Print specific part from an URL by php

Question

I would like to print only specific part from an Url like for example if i got on response an URL like this :

https://tvoauth.zapi.com/?client=zapi-web-1&session=XRpC8tmn2_VUz6temt_j19BIGymiYyd5ZOLoWtp1H5U&scopes=false&redirect=https%3A%2F%2Ftv.zapi.com

I want to print only this part exactly :

XRpC8tmn2_VUz6temt_j19BIGymiYyd5ZOLoWtp1H5U

I have tried to use substr like this :

$string=$headers['location'][0];

$substring = substr($string, strpos($string, '=') + 1);
// Use substr() again to get the part of the string before the semicolon
$final_string = substr($substring, 0, strpos($substring, ';'));
   file_put_contents("xxx", $final_string);
   $xtoken = file_get_contents("xxx");

but it's doesn't print nothing to my file xxx

but if I apply it like this only :

$string=$headers['location'][0];

   file_put_contents("xxx", $string);
   $xtoken = file_get_contents("xxx");

it print full line as I mentioned above .

Hope I find the right guide to be able to select & print only that specific part I want .

thank you .

Answer 1

Perhaps a combination of parse_url and then parse_str could help without needing substr?

As an example:

<?php

$url = 'https://tvoauth.zapi.com/?client=zapi-web-1&session=XRpC8tmn2_VUz6temt_j19BIGymiYyd5ZOLoWtp1H5U&scopes=false&redirect=https%3A%2F%2Ftv.zapi.com';

$parsed = parse_url($url);

var_dump($parsed);

$output = [];

parse_str($parsed['query'], $output);

var_dump($output);

echo $output['session'];

Gives the output:

array(4) {
  ["scheme"]=>
  string(5) "https"
  ["host"]=>
  string(16) "tvoauth.zapi.com"
  ["path"]=>
  string(1) "/"
  ["query"]=>
  string(117) "client=zapi-web-1&session=XRpC8tmn2_VUz6temt_j19BIGymiYyd5ZOLoWtp1H5U&scopes=false&redirect=https%3A%2F%2Ftv.zapi.com"
}

array(4) {
  ["client"]=>
  string(10) "zapi-web-1"
  ["session"]=>
  string(43) "XRpC8tmn2_VUz6temt_j19BIGymiYyd5ZOLoWtp1H5U"
  ["scopes"]=>
  string(5) "false"
  ["redirect"]=>
  string(19) "https://tv.zapi.com"
}

XRpC8tmn2_VUz6temt_j19BIGymiYyd5ZOLoWtp1H5U

The example is here if you'd like to try a test run.

---

EDIT: from the comment about the file:
(will not be able to write to a file in the online example)

Then to the file can be file_put_contents("xxx", $output['session']);, or whatever one would prefer to call $output if a different name is desired.

---

... based on your original code with:

$string=$headers['location'][0];

$substring = substr($string, strpos($string, '=') + 1);
// Use substr() again to get the part of the string before the semicolon
$final_string = substr($substring, 0, strpos($substring, ';'));
   file_put_contents("xxx", $final_string);
   $xtoken = file_get_contents("xxx");

... could change to:

$string=$headers['location'][0];

$theURL = parse_url($string);
$output = [];

parse_str($theURL['query'], $output));
   file_put_contents("xxx", $output['session']);
   $xtoken = file_get_contents("xxx");

Answer 2

If you are working with the URL, Just use the super global $_GET. In your question you are needing the string that pertains to the session. So to get that string

$string = $_GET['session']; 
file_put_contents('xxx',$string);

To access the other parameters you would use:

$client = $_GET['client'];
$scope = $_GET['scopes'];
$redirect = $_GET['redirect'];