How to remove newlines from header

[Max58kl]

I have a form with a textarea field.
Everything is ok until the user submitting the form adds returns characters.

When return characters are added I get this error

Warning: Header may not contain more than a single header, new line detected

This is the part of the script highlighted by the error message.

header('Location:' . $_action);

[johny10151981]

use str_replace function

[Max58kl]

If I submit the form refrencing 'report_pubaccess' I get this vardump

getarray(2) {
  ["pub_access"]=>
  string(11) "laptop four"
  ["report_pubaccess"]=>
  string(7) "testing"
}

If I asign report_pubaccess to a variable $report using string replace
and send the variable

$report = str_replace("\n", " ", trim($_GET['report_pubaccess'])); 

The variable is send however not the text

getarray(2) {
  ["pub_access"]=>
  string(10) "laptop one"
  ["$report"]=>
  string(1) "1"
}

Variable version

$_def_soft_id = 1;
$_def_id = 9876;
 
 $_soft_id = isset($_GET[$report]) ? $_GET[$report] : $_def_soft_id;
$_id = isset($_GET['pub_access']) ? $_GET['pub_access'] : $_def_id;
 
$_action = 'report_confirm_pub.php?pub_access=' . $_id . '&$report=' . $_soft_id;
 
header('Location:' . $_action);

'report_pubaccess' version

$_def_soft_id = 1;
$_def_id = 9876;
 
 $_soft_id = isset($_GET['report_pubaccess']) ? $_GET['report_pubaccess'] : $_def_soft_id;
$_id = isset($_GET['pub_access']) ? $_GET['pub_access'] : $_def_id;
 
$_action = 'report_confirm_pub.php?pub_access=' . $_id . '&report_pubaccess=' . $_soft_id;
 
header('Location:' . $_action);